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- ERC-20 Tokens (4)0.03618036 stETH
stETH (stETH)$120.83@3,339.550.00066521 WETH
Wrapped Ethe... (WETH)$2.22@3,339.2050.00001349 ysWETH
ERC-20: stET... (ysWETH)1 TokenERC-20 TOKEN*[Suspicious]# mbadge.org : lido legends
# MBADGE.ORG : LIDO LEGENDSERC-1155EthereumEthereumERC-1155Noox.fi Distribution ProtocolNoox.fi : Lido Airdrop RecipientERC-1155OETHOETH NFT #1911ERC-1155claim rewards on poolstake.orgpoolstake.orgERC-1155Puffer Mystery Box NFT pufether.orgPuffer Mystery Box NFT pufether.orgERC-1155debridgeth.comWithdrawal Badge debridgeth.comERC-1155ether-origin.comWithdrawal NFT ether-origin.comERC-1155Withdrawal NFT originethers.commWithdrawal NFT originethers.comERC-1155claim rewards on wsteth.comwsteth.comERC-1155Let's Go!🎁ERC-1155ERC-1155 TOKEN*[Suspicious]ERC-1155 TOKEN*[Suspicious]ERC-1155 TOKEN*[Spam]ERC-1155 TOKEN*[Spam]ERC-1155 TOKEN*[Spam]ERC-1155 TOKEN*[Spam]ERC-1155 TOKEN*[Spam]ERC-1155 TOKEN*[Spam]More Info
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Latest 10 from a total of 10 transactions
Transaction Hash MethodBlockFromToRedeem 21522360 17 hrs ago IN 0 ETH 0.00241685 Report 20887473 89 days ago IN 0 ETH 0.00169187 Transfer 20706853 114 days ago IN 0 ETH 0.0000862 Set Performance ... 20706844 114 days ago IN 0 ETH 0.00006103 Set Profit Max U... 20706840 114 days ago IN 0 ETH 0.00005656 Set Buffer Slipp... 20706826 114 days ago IN 0 ETH 0.00006431 Set Allowed 19483578 285 days ago IN 0 ETH 0.00178581 Set Open 19483573 285 days ago IN 0 ETH 0.00093584 Set Emergency Ad... 19453404 289 days ago IN 0 ETH 0.00152413 Set Keeper 19453401 289 days ago IN 0 ETH 0.00104164 Latest 25 internal transactions (View All)
Advanced mode:View All Internal TransactionsParent Transaction Hash Block FromTo21522360 17 hrs ago 0.12228552 ETH 21522360 17 hrs ago 0.12228552 ETH 20959697 79 days ago 0.05235453 ETH 20959697 79 days ago 0.05235453 ETH 20953301 80 days ago 126.08064365 ETH 20953301 80 days ago 126.08064365 ETH 20949249 80 days ago 24.73013794 ETH 20949249 80 days ago 24.73013794 ETH 20945451 81 days ago 62.71267835 ETH 20945451 81 days ago 62.71267835 ETH 20909036 86 days ago 0.05894531 ETH 20909036 86 days ago 0.05894531 ETH 20887494 89 days ago 57.14587641 ETH 20887494 89 days ago 57.14587641 ETH 20702438 115 days ago 95.27965807 ETH 20702438 115 days ago 95.27965807 ETH 20702355 115 days ago 127.40978527 ETH 20702355 115 days ago 127.40978527 ETH 20698266 115 days ago 28.08891787 ETH 20698266 115 days ago 28.08891787 ETH 20688066 117 days ago 24.1418671 ETH 20688066 117 days ago 24.1418671 ETH 20683732 117 days ago 27.07381783 ETH 20683732 117 days ago 27.07381783 ETH 20673773 119 days ago 35.04655834 ETH Loading...LoadingContract Name:Strategy
Compiler Versionv0.8.18+commit.87f61d96
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2024-03-17 */ // SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.18; // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol) // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 amount) external returns (bool); } // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); } // OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol) /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } function _contextSuffixLength() internal view virtual returns (uint256) { return 0; } } /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * The default value of {decimals} is 18. To change this, you should override * this function so it returns a different value. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the default value returned by this function, unless * it's overridden. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer(address from, address to, uint256 amount) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} } // TokenizedStrategy interface used for internal view delegateCalls. // OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4626.sol) /** * @dev Interface of the ERC4626 "Tokenized Vault Standard", as defined in * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626]. * * _Available since v4.7._ */ interface IERC4626 is IERC20, IERC20Metadata { event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares); event Withdraw( address indexed sender, address indexed receiver, address indexed owner, uint256 assets, uint256 shares ); /** * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing. * * - MUST be an ERC-20 token contract. * - MUST NOT revert. */ function asset() external view returns (address assetTokenAddress); /** * @dev Returns the total amount of the underlying asset that is “managed” by Vault. * * - SHOULD include any compounding that occurs from yield. * - MUST be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT revert. */ function totalAssets() external view returns (uint256 totalManagedAssets); /** * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal * scenario where all the conditions are met. * * - MUST NOT be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT show any variations depending on the caller. * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * - MUST NOT revert. * * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and * from. */ function convertToShares(uint256 assets) external view returns (uint256 shares); /** * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal * scenario where all the conditions are met. * * - MUST NOT be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT show any variations depending on the caller. * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * - MUST NOT revert. * * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and * from. */ function convertToAssets(uint256 shares) external view returns (uint256 assets); /** * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver, * through a deposit call. * * - MUST return a limited value if receiver is subject to some deposit limit. * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited. * - MUST NOT revert. */ function maxDeposit(address receiver) external view returns (uint256 maxAssets); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given * current on-chain conditions. * * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit * call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called * in the same transaction. * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the * deposit would be accepted, regardless if the user has enough tokens approved, etc. * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewDeposit(uint256 assets) external view returns (uint256 shares); /** * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens. * * - MUST emit the Deposit event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the * deposit execution, and are accounted for during deposit. * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not * approving enough underlying tokens to the Vault contract, etc). * * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token. */ function deposit(uint256 assets, address receiver) external returns (uint256 shares); /** * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call. * - MUST return a limited value if receiver is subject to some mint limit. * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted. * - MUST NOT revert. */ function maxMint(address receiver) external view returns (uint256 maxShares); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given * current on-chain conditions. * * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call * in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the * same transaction. * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint * would be accepted, regardless if the user has enough tokens approved, etc. * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by minting. */ function previewMint(uint256 shares) external view returns (uint256 assets); /** * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens. * * - MUST emit the Deposit event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint * execution, and are accounted for during mint. * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not * approving enough underlying tokens to the Vault contract, etc). * * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token. */ function mint(uint256 shares, address receiver) external returns (uint256 assets); /** * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the * Vault, through a withdraw call. * * - MUST return a limited value if owner is subject to some withdrawal limit or timelock. * - MUST NOT revert. */ function maxWithdraw(address owner) external view returns (uint256 maxAssets); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block, * given current on-chain conditions. * * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw * call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if * called * in the same transaction. * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though * the withdrawal would be accepted, regardless if the user has enough shares, etc. * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewWithdraw(uint256 assets) external view returns (uint256 shares); /** * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver. * * - MUST emit the Withdraw event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the * withdraw execution, and are accounted for during withdraw. * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner * not having enough shares, etc). * * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed. * Those methods should be performed separately. */ function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares); /** * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault, * through a redeem call. * * - MUST return a limited value if owner is subject to some withdrawal limit or timelock. * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock. * - MUST NOT revert. */ function maxRedeem(address owner) external view returns (uint256 maxShares); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block, * given current on-chain conditions. * * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call * in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the * same transaction. * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the * redemption would be accepted, regardless if the user has enough shares, etc. * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by redeeming. */ function previewRedeem(uint256 shares) external view returns (uint256 assets); /** * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver. * * - MUST emit the Withdraw event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the * redeem execution, and are accounted for during redeem. * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner * not having enough shares, etc). * * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed. * Those methods should be performed separately. */ function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets); } // OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol) /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * ==== Security Considerations * * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be * considered as an intention to spend the allowance in any specific way. The second is that because permits have * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be * generally recommended is: * * ```solidity * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public { * try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {} * doThing(..., value); * } * * function doThing(..., uint256 value) public { * token.safeTransferFrom(msg.sender, address(this), value); * ... * } * ``` * * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also * {SafeERC20-safeTransferFrom}). * * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so * contracts should have entry points that don't rely on permit. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. * * CAUTION: See Security Considerations above. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); } // Interface that implements the 4626 standard and the implementation functions interface ITokenizedStrategy is IERC4626, IERC20Permit { /*////////////////////////////////////////////////////////////// EVENTS //////////////////////////////////////////////////////////////*/ event StrategyShutdown(); event NewTokenizedStrategy( address indexed strategy, address indexed asset, string apiVersion ); event Reported( uint256 profit, uint256 loss, uint256 protocolFees, uint256 performanceFees ); event UpdatePerformanceFeeRecipient( address indexed newPerformanceFeeRecipient ); event UpdateKeeper(address indexed newKeeper); event UpdatePerformanceFee(uint16 newPerformanceFee); event UpdateManagement(address indexed newManagement); event UpdateEmergencyAdmin(address indexed newEmergencyAdmin); event UpdateProfitMaxUnlockTime(uint256 newProfitMaxUnlockTime); event UpdatePendingManagement(address indexed newPendingManagement); /*////////////////////////////////////////////////////////////// INITIALIZATION //////////////////////////////////////////////////////////////*/ function initialize( address _asset, string memory _name, address _management, address _performanceFeeRecipient, address _keeper ) external; /*////////////////////////////////////////////////////////////// NON-STANDARD 4626 OPTIONS //////////////////////////////////////////////////////////////*/ function withdraw( uint256 assets, address receiver, address owner, uint256 maxLoss ) external returns (uint256); function redeem( uint256 shares, address receiver, address owner, uint256 maxLoss ) external returns (uint256); /*////////////////////////////////////////////////////////////// MODIFIER HELPERS //////////////////////////////////////////////////////////////*/ function requireManagement(address _sender) external view; function requireKeeperOrManagement(address _sender) external view; function requireEmergencyAuthorized(address _sender) external view; /*////////////////////////////////////////////////////////////// KEEPERS FUNCTIONS //////////////////////////////////////////////////////////////*/ function tend() external; function report() external returns (uint256 _profit, uint256 _loss); /*////////////////////////////////////////////////////////////// CONSTANTS //////////////////////////////////////////////////////////////*/ function MAX_FEE() external view returns (uint16); function FACTORY() external view returns (address); /*////////////////////////////////////////////////////////////// GETTERS //////////////////////////////////////////////////////////////*/ function apiVersion() external view returns (string memory); function pricePerShare() external view returns (uint256); function management() external view returns (address); function pendingManagement() external view returns (address); function keeper() external view returns (address); function emergencyAdmin() external view returns (address); function performanceFee() external view returns (uint16); function performanceFeeRecipient() external view returns (address); function fullProfitUnlockDate() external view returns (uint256); function profitUnlockingRate() external view returns (uint256); function profitMaxUnlockTime() external view returns (uint256); function lastReport() external view returns (uint256); function isShutdown() external view returns (bool); function unlockedShares() external view returns (uint256); /*////////////////////////////////////////////////////////////// SETTERS //////////////////////////////////////////////////////////////*/ function setPendingManagement(address) external; function acceptManagement() external; function setKeeper(address _keeper) external; function setEmergencyAdmin(address _emergencyAdmin) external; function setPerformanceFee(uint16 _performanceFee) external; function setPerformanceFeeRecipient( address _performanceFeeRecipient ) external; function setProfitMaxUnlockTime(uint256 _profitMaxUnlockTime) external; function shutdownStrategy() external; function emergencyWithdraw(uint256 _amount) external; } /** * @title YearnV3 Base Strategy * @author yearn.finance * @notice * BaseStrategy implements all of the required functionality to * seamlessly integrate with the `TokenizedStrategy` implementation contract * allowing anyone to easily build a fully permissionless ERC-4626 compliant * Vault by inheriting this contract and overriding three simple functions. * It utilizes an immutable proxy pattern that allows the BaseStrategy * to remain simple and small. All standard logic is held within the * `TokenizedStrategy` and is reused over any n strategies all using the * `fallback` function to delegatecall the implementation so that strategists * can only be concerned with writing their strategy specific code. * * This contract should be inherited and the three main abstract methods * `_deployFunds`, `_freeFunds` and `_harvestAndReport` implemented to adapt * the Strategy to the particular needs it has to generate yield. There are * other optional methods that can be implemented to further customize * the strategy if desired. * * All default storage for the strategy is controlled and updated by the * `TokenizedStrategy`. The implementation holds a storage struct that * contains all needed global variables in a manual storage slot. This * means strategists can feel free to implement their own custom storage * variables as they need with no concern of collisions. All global variables * can be viewed within the Strategy by a simple call using the * `TokenizedStrategy` variable. IE: TokenizedStrategy.globalVariable();. */ abstract contract BaseStrategy { /*////////////////////////////////////////////////////////////// MODIFIERS //////////////////////////////////////////////////////////////*/ /** * @dev Used on TokenizedStrategy callback functions to make sure it is post * a delegateCall from this address to the TokenizedStrategy. */ modifier onlySelf() { _onlySelf(); _; } /** * @dev Use to assure that the call is coming from the strategies management. */ modifier onlyManagement() { TokenizedStrategy.requireManagement(msg.sender); _; } /** * @dev Use to assure that the call is coming from either the strategies * management or the keeper. */ modifier onlyKeepers() { TokenizedStrategy.requireKeeperOrManagement(msg.sender); _; } /** * @dev Use to assure that the call is coming from either the strategies * management or the emergency admin. */ modifier onlyEmergencyAuthorized() { TokenizedStrategy.requireEmergencyAuthorized(msg.sender); _; } /** * @dev Require that the msg.sender is this address. */ function _onlySelf() internal view { require(msg.sender == address(this), "!self"); } /*////////////////////////////////////////////////////////////// CONSTANTS //////////////////////////////////////////////////////////////*/ /** * @dev This is the address of the TokenizedStrategy implementation * contract that will be used by all strategies to handle the * accounting, logic, storage etc. * * Any external calls to the that don't hit one of the functions * defined in this base or the strategy will end up being forwarded * through the fallback function, which will delegateCall this address. * * This address should be the same for every strategy, never be adjusted * and always be checked before any integration with the Strategy. */ address public constant tokenizedStrategyAddress = 0xBB51273D6c746910C7C06fe718f30c936170feD0; /*////////////////////////////////////////////////////////////// IMMUTABLES //////////////////////////////////////////////////////////////*/ /** * @dev Underlying asset the Strategy is earning yield on. * Stored here for cheap retrievals within the strategy. */ ERC20 internal immutable asset; /** * @dev This variable is set to address(this) during initialization of each strategy. * * This can be used to retrieve storage data within the strategy * contract as if it were a linked library. * * i.e. uint256 totalAssets = TokenizedStrategy.totalAssets() * * Using address(this) will mean any calls using this variable will lead * to a call to itself. Which will hit the fallback function and * delegateCall that to the actual TokenizedStrategy. */ ITokenizedStrategy internal immutable TokenizedStrategy; /** * @notice Used to initialize the strategy on deployment. * * This will set the `TokenizedStrategy` variable for easy * internal view calls to the implementation. As well as * initializing the default storage variables based on the * parameters and using the deployer for the permissioned roles. * * @param _asset Address of the underlying asset. * @param _name Name the strategy will use. */ constructor(address _asset, string memory _name) { asset = ERC20(_asset); // Set instance of the implementation for internal use. TokenizedStrategy = ITokenizedStrategy(address(this)); // Initialize the strategy's storage variables. _delegateCall( abi.encodeCall( ITokenizedStrategy.initialize, (_asset, _name, msg.sender, msg.sender, msg.sender) ) ); // Store the tokenizedStrategyAddress at the standard implementation // address storage slot so etherscan picks up the interface. This gets // stored on initialization and never updated. assembly { sstore( // keccak256('eip1967.proxy.implementation' - 1) 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc, tokenizedStrategyAddress ) } } /*////////////////////////////////////////////////////////////// NEEDED TO BE OVERRIDDEN BY STRATEGIST //////////////////////////////////////////////////////////////*/ /** * @dev Can deploy up to '_amount' of 'asset' in the yield source. * * This function is called at the end of a {deposit} or {mint} * call. Meaning that unless a whitelist is implemented it will * be entirely permissionless and thus can be sandwiched or otherwise * manipulated. * * @param _amount The amount of 'asset' that the strategy can attempt * to deposit in the yield source. */ function _deployFunds(uint256 _amount) internal virtual; /** * @dev Should attempt to free the '_amount' of 'asset'. * * NOTE: The amount of 'asset' that is already loose has already * been accounted for. * * This function is called during {withdraw} and {redeem} calls. * Meaning that unless a whitelist is implemented it will be * entirely permissionless and thus can be sandwiched or otherwise * manipulated. * * Should not rely on asset.balanceOf(address(this)) calls other than * for diff accounting purposes. * * Any difference between `_amount` and what is actually freed will be * counted as a loss and passed on to the withdrawer. This means * care should be taken in times of illiquidity. It may be better to revert * if withdraws are simply illiquid so not to realize incorrect losses. * * @param _amount, The amount of 'asset' to be freed. */ function _freeFunds(uint256 _amount) internal virtual; /** * @dev Internal function to harvest all rewards, redeploy any idle * funds and return an accurate accounting of all funds currently * held by the Strategy. * * This should do any needed harvesting, rewards selling, accrual, * redepositing etc. to get the most accurate view of current assets. * * NOTE: All applicable assets including loose assets should be * accounted for in this function. * * Care should be taken when relying on oracles or swap values rather * than actual amounts as all Strategy profit/loss accounting will * be done based on this returned value. * * This can still be called post a shutdown, a strategist can check * `TokenizedStrategy.isShutdown()` to decide if funds should be * redeployed or simply realize any profits/losses. * * @return _totalAssets A trusted and accurate account for the total * amount of 'asset' the strategy currently holds including idle funds. */ function _harvestAndReport() internal virtual returns (uint256 _totalAssets); /*////////////////////////////////////////////////////////////// OPTIONAL TO OVERRIDE BY STRATEGIST //////////////////////////////////////////////////////////////*/ /** * @dev Optional function for strategist to override that can * be called in between reports. * * If '_tend' is used tendTrigger() will also need to be overridden. * * This call can only be called by a permissioned role so may be * through protected relays. * * This can be used to harvest and compound rewards, deposit idle funds, * perform needed position maintenance or anything else that doesn't need * a full report for. * * EX: A strategy that can not deposit funds without getting * sandwiched can use the tend when a certain threshold * of idle to totalAssets has been reached. * * This will have no effect on PPS of the strategy till report() is called. * * @param _totalIdle The current amount of idle funds that are available to deploy. */ function _tend(uint256 _totalIdle) internal virtual {} /** * @dev Optional trigger to override if tend() will be used by the strategy. * This must be implemented if the strategy hopes to invoke _tend(). * * @return . Should return true if tend() should be called by keeper or false if not. */ function _tendTrigger() internal view virtual returns (bool) { return false; } /** * @notice Returns if tend() should be called by a keeper. * * @return . Should return true if tend() should be called by keeper or false if not. * @return . Calldata for the tend call. */ function tendTrigger() external view virtual returns (bool, bytes memory) { return ( // Return the status of the tend trigger. _tendTrigger(), // And the needed calldata either way. abi.encodeWithSelector(ITokenizedStrategy.tend.selector) ); } /** * @notice Gets the max amount of `asset` that an address can deposit. * @dev Defaults to an unlimited amount for any address. But can * be overridden by strategists. * * This function will be called before any deposit or mints to enforce * any limits desired by the strategist. This can be used for either a * traditional deposit limit or for implementing a whitelist etc. * * EX: * if(isAllowed[_owner]) return super.availableDepositLimit(_owner); * * This does not need to take into account any conversion rates * from shares to assets. But should know that any non max uint256 * amounts may be converted to shares. So it is recommended to keep * custom amounts low enough as not to cause overflow when multiplied * by `totalSupply`. * * @param . The address that is depositing into the strategy. * @return . The available amount the `_owner` can deposit in terms of `asset` */ function availableDepositLimit( address /*_owner*/ ) public view virtual returns (uint256) { return type(uint256).max; } /** * @notice Gets the max amount of `asset` that can be withdrawn. * @dev Defaults to an unlimited amount for any address. But can * be overridden by strategists. * * This function will be called before any withdraw or redeem to enforce * any limits desired by the strategist. This can be used for illiquid * or sandwichable strategies. It should never be lower than `totalIdle`. * * EX: * return TokenIzedStrategy.totalIdle(); * * This does not need to take into account the `_owner`'s share balance * or conversion rates from shares to assets. * * @param . The address that is withdrawing from the strategy. * @return . The available amount that can be withdrawn in terms of `asset` */ function availableWithdrawLimit( address /*_owner*/ ) public view virtual returns (uint256) { return type(uint256).max; } /** * @dev Optional function for a strategist to override that will * allow management to manually withdraw deployed funds from the * yield source if a strategy is shutdown. * * This should attempt to free `_amount`, noting that `_amount` may * be more than is currently deployed. * * NOTE: This will not realize any profits or losses. A separate * {report} will be needed in order to record any profit/loss. If * a report may need to be called after a shutdown it is important * to check if the strategy is shutdown during {_harvestAndReport} * so that it does not simply re-deploy all funds that had been freed. * * EX: * if(freeAsset > 0 && !TokenizedStrategy.isShutdown()) { * depositFunds... * } * * @param _amount The amount of asset to attempt to free. */ function _emergencyWithdraw(uint256 _amount) internal virtual {} /*////////////////////////////////////////////////////////////// TokenizedStrategy HOOKS //////////////////////////////////////////////////////////////*/ /** * @notice Can deploy up to '_amount' of 'asset' in yield source. * @dev Callback for the TokenizedStrategy to call during a {deposit} * or {mint} to tell the strategy it can deploy funds. * * Since this can only be called after a {deposit} or {mint} * delegateCall to the TokenizedStrategy msg.sender == address(this). * * Unless a whitelist is implemented this will be entirely permissionless * and thus can be sandwiched or otherwise manipulated. * * @param _amount The amount of 'asset' that the strategy can * attempt to deposit in the yield source. */ function deployFunds(uint256 _amount) external virtual onlySelf { _deployFunds(_amount); } /** * @notice Should attempt to free the '_amount' of 'asset'. * @dev Callback for the TokenizedStrategy to call during a withdraw * or redeem to free the needed funds to service the withdraw. * * This can only be called after a 'withdraw' or 'redeem' delegateCall * to the TokenizedStrategy so msg.sender == address(this). * * @param _amount The amount of 'asset' that the strategy should attempt to free up. */ function freeFunds(uint256 _amount) external virtual onlySelf { _freeFunds(_amount); } /** * @notice Returns the accurate amount of all funds currently * held by the Strategy. * @dev Callback for the TokenizedStrategy to call during a report to * get an accurate accounting of assets the strategy controls. * * This can only be called after a report() delegateCall to the * TokenizedStrategy so msg.sender == address(this). * * @return . A trusted and accurate account for the total amount * of 'asset' the strategy currently holds including idle funds. */ function harvestAndReport() external virtual onlySelf returns (uint256) { return _harvestAndReport(); } /** * @notice Will call the internal '_tend' when a keeper tends the strategy. * @dev Callback for the TokenizedStrategy to initiate a _tend call in the strategy. * * This can only be called after a tend() delegateCall to the TokenizedStrategy * so msg.sender == address(this). * * We name the function `tendThis` so that `tend` calls are forwarded to * the TokenizedStrategy. * @param _totalIdle The amount of current idle funds that can be * deployed during the tend */ function tendThis(uint256 _totalIdle) external virtual onlySelf { _tend(_totalIdle); } /** * @notice Will call the internal '_emergencyWithdraw' function. * @dev Callback for the TokenizedStrategy during an emergency withdraw. * * This can only be called after a emergencyWithdraw() delegateCall to * the TokenizedStrategy so msg.sender == address(this). * * We name the function `shutdownWithdraw` so that `emergencyWithdraw` * calls are forwarded to the TokenizedStrategy. * * @param _amount The amount of asset to attempt to free. */ function shutdownWithdraw(uint256 _amount) external virtual onlySelf { _emergencyWithdraw(_amount); } /** * @dev Function used to delegate call the TokenizedStrategy with * certain `_calldata` and return any return values. * * This is used to setup the initial storage of the strategy, and * can be used by strategist to forward any other call to the * TokenizedStrategy implementation. * * @param _calldata The abi encoded calldata to use in delegatecall. * @return . The return value if the call was successful in bytes. */ function _delegateCall( bytes memory _calldata ) internal returns (bytes memory) { // Delegate call the tokenized strategy with provided calldata. (bool success, bytes memory result) = tokenizedStrategyAddress .delegatecall(_calldata); // If the call reverted. Return the error. if (!success) { assembly { let ptr := mload(0x40) let size := returndatasize() returndatacopy(ptr, 0, size) revert(ptr, size) } } // Return the result. return result; } /** * @dev Execute a function on the TokenizedStrategy and return any value. * * This fallback function will be executed when any of the standard functions * defined in the TokenizedStrategy are called since they wont be defined in * this contract. * * It will delegatecall the TokenizedStrategy implementation with the exact * calldata and return any relevant values. * */ fallback() external { // load our target address address _tokenizedStrategyAddress = tokenizedStrategyAddress; // Execute external function using delegatecall and return any value. assembly { // Copy function selector and any arguments. calldatacopy(0, 0, calldatasize()) // Execute function delegatecall. let result := delegatecall( gas(), _tokenizedStrategyAddress, 0, calldatasize(), 0, 0 ) // Get any return value returndatacopy(0, 0, returndatasize()) // Return any return value or error back to the caller switch result case 0 { revert(0, returndatasize()) } default { return(0, returndatasize()) } } } } /** * @title Base Health Check * @author Yearn.finance * @notice This contract can be inherited by any Yearn * V3 strategy wishing to implement a health check during * the `report` function in order to prevent any unexpected * behavior from being permanently recorded as well as the * `checkHealth` modifier. * * A strategist simply needs to inherit this contract. Set * the limit ratios to the desired amounts and then * override `_harvestAndReport()` just as they otherwise * would. If the profit or loss that would be recorded is * outside the acceptable bounds the tx will revert. * * The healthcheck does not prevent a strategy from reporting * losses, but rather can make sure manual intervention is * needed before reporting an unexpected loss or profit. */ abstract contract BaseHealthCheck is BaseStrategy { // Can be used to determine if a healthcheck should be called. // Defaults to true; bool public doHealthCheck = true; uint256 internal constant MAX_BPS = 10_000; // Default profit limit to 100%. uint256 private _profitLimitRatio = MAX_BPS; // Defaults loss limit to 0. uint256 private _lossLimitRatio; constructor( address _asset, string memory _name ) BaseStrategy(_asset, _name) {} /** * @notice Returns the current profit limit ratio. * @dev Use a getter function to keep the variable private. * @return . The current profit limit ratio. */ function profitLimitRatio() public view returns (uint256) { return _profitLimitRatio; } /** * @notice Returns the current loss limit ratio. * @dev Use a getter function to keep the variable private. * @return . The current loss limit ratio. */ function lossLimitRatio() public view returns (uint256) { return _lossLimitRatio; } /** * @notice Set the `profitLimitRatio`. * @dev Denominated in basis points. I.E. 1_000 == 10%. * @param _newProfitLimitRatio The mew profit limit ratio. */ function setProfitLimitRatio( uint256 _newProfitLimitRatio ) external onlyManagement { _setProfitLimitRatio(_newProfitLimitRatio); } /** * @dev Internally set the profit limit ratio. Denominated * in basis points. I.E. 1_000 == 10%. * @param _newProfitLimitRatio The mew profit limit ratio. */ function _setProfitLimitRatio(uint256 _newProfitLimitRatio) internal { require(_newProfitLimitRatio > 0, "!zero profit"); _profitLimitRatio = _newProfitLimitRatio; } /** * @notice Set the `lossLimitRatio`. * @dev Denominated in basis points. I.E. 1_000 == 10%. * @param _newLossLimitRatio The new loss limit ratio. */ function setLossLimitRatio( uint256 _newLossLimitRatio ) external onlyManagement { _setLossLimitRatio(_newLossLimitRatio); } /** * @dev Internally set the loss limit ratio. Denominated * in basis points. I.E. 1_000 == 10%. * @param _newLossLimitRatio The new loss limit ratio. */ function _setLossLimitRatio(uint256 _newLossLimitRatio) internal { require(_newLossLimitRatio < MAX_BPS, "!loss limit"); _lossLimitRatio = _newLossLimitRatio; } /** * @notice Turns the healthcheck on and off. * @dev If turned off the next report will auto turn it back on. * @param _doHealthCheck Bool if healthCheck should be done. */ function setDoHealthCheck(bool _doHealthCheck) public onlyManagement { doHealthCheck = _doHealthCheck; } /** * @notice OVerrides the default {harvestAndReport} to include a healthcheck. * @return _totalAssets New totalAssets post report. */ function harvestAndReport() external override onlySelf returns (uint256 _totalAssets) { // Let the strategy report. _totalAssets = _harvestAndReport(); // Run the healthcheck on the amount returned. _executeHealthCheck(_totalAssets); } /** * @dev To be called during a report to make sure the profit * or loss being recorded is within the acceptable bound. * * @param _newTotalAssets The amount that will be reported. */ function _executeHealthCheck(uint256 _newTotalAssets) internal virtual { if (!doHealthCheck) { doHealthCheck = true; return; } // Get the current total assets from the implementation. uint256 currentTotalAssets = TokenizedStrategy.totalAssets(); if (_newTotalAssets > currentTotalAssets) { require( ((_newTotalAssets - currentTotalAssets) <= (currentTotalAssets * _profitLimitRatio) / MAX_BPS), "healthCheck" ); } else if (currentTotalAssets > _newTotalAssets) { require( (currentTotalAssets - _newTotalAssets <= ((currentTotalAssets * _lossLimitRatio) / MAX_BPS)), "healthCheck" ); } } } // OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol) /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { // Solidity will revert if denominator == 0, unlike the div opcode on its own. // The surrounding unchecked block does not change this fact. // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic. return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1, "Math: mulDiv overflow"); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10 ** 64) { value /= 10 ** 64; result += 64; } if (value >= 10 ** 32) { value /= 10 ** 32; result += 32; } if (value >= 10 ** 16) { value /= 10 ** 16; result += 16; } if (value >= 10 ** 8) { value /= 10 ** 8; result += 8; } if (value >= 10 ** 4) { value /= 10 ** 4; result += 4; } if (value >= 10 ** 2) { value /= 10 ** 2; result += 2; } if (value >= 10 ** 1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 256, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0); } } } // OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol) // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol) /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval * to be set to zero before setting it to a non-zero value, such as USDT. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } } interface IWETH is IERC20 { function deposit() external payable; function decimals() external view returns (uint256); function withdraw(uint256) external; } interface ISTETH is IERC20 { //function getPooledEthByShares(uint256 _sharesAmount) external view returns (uint256); //function getSharesByPooledEth(uint256 _pooledEthAmount) external view returns (uint256); event Submitted(address sender, uint256 amount, address referral); function submit(address) external payable returns (uint256); function isStakingPaused() external returns (bool); } interface IWSTETH is IERC20 { /** * @notice Get amount of wstETH obtained for a given amount of stETH * @param _stETHAmount amount of stETH * @return Amount of wstETH obtained for a given stETH amount */ function getWstETHByStETH(uint256 _stETHAmount) external view returns (uint256); /** * @notice Get amount of stETH obtained for a given amount of wstETH * @param _wstETHAmount amount of wstETH * @return Amount of stETH obtained for a given wstETH amount */ function getStETHByWstETH(uint256 _wstETHAmount) external view returns (uint256); /** * @notice Get amount of stETH obtained for one wstETH * @return Amount of stETH obtained for one wstETH */ //function stEthPerToken() external view returns (uint256); /** * @notice Get amount of wstETH obtained for one stETH * @return Amount of wstETH obtained for one stETH */ //function tokensPerStEth() external view returns (uint256); /** * @notice Exchanges stETH to wstETH * @param _stETHAmount amount of stETH to wrap in exchange for wstETH * @dev Requirements: * - `_stETHAmount` must be non-zero * - msg.sender must approve at least `_stETHAmount` stETH to this * contract. * - msg.sender must have at least `_stETHAmount` of stETH. * User should first approve _stETHAmount to the WstETH contract * @return Amount of wstETH user receives after wrap */ function wrap(uint256 _stETHAmount) external returns (uint256); /** * @notice Exchanges wstETH to stETH * @param _wstETHAmount amount of wstETH to uwrap in exchange for stETH * @dev Requirements: * - `_wstETHAmount` must be non-zero * - msg.sender must have at least `_wstETHAmount` wstETH. * @return Amount of stETH user receives after unwrap */ function unwrap(uint256 _wstETHAmount) external returns (uint256); } interface IQueue { function requestWithdrawals(uint256[] calldata _amounts, address _owner) external returns (uint256[] memory requestIds); function claimWithdrawal(uint256 _requestId) external; } interface ICurve { function exchange( int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount ) external payable returns(uint256); function price_oracle() external view returns(uint256); function balances(uint256) external view returns (uint256); function get_dy( int128 from, int128 to, uint256 _from_amount ) external view returns (uint256); } interface AggregatorInterface { function latestAnswer() external view returns (int256); function latestTimestamp() external view returns (uint256); function latestRound() external view returns (uint256); function latestRoundData() external view returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound); function getAnswer(uint256 roundId) external view returns (int256); function getTimestamp(uint256 roundId) external view returns (uint256); event AnswerUpdated( int256 indexed current, uint256 indexed roundId, uint256 updatedAt ); event NewRound( uint256 indexed roundId, address indexed startedBy, uint256 startedAt ); } /// @title yearn-v3-LST-MAINNET-STETH /// @author mil0x /// @notice yearn-v3 Strategy that stakes asset into Liquid Staking Token (LST). contract Strategy is BaseHealthCheck { using SafeERC20 for ERC20; address internal constant LST = 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84; //STETH address internal constant withdrawalQueueLST = 0x889edC2eDab5f40e902b864aD4d7AdE8E412F9B1; //STETH withdrawal queue // Use chainlink oracle to check latest LST/asset price AggregatorInterface public chainlinkOracle = AggregatorInterface(0x86392dC19c0b719886221c78AB11eb8Cf5c52812); //STETH/ETH uint256 public chainlinkHeartbeat = 86400; address public curve = 0xDC24316b9AE028F1497c275EB9192a3Ea0f67022; //curve_ETH_STETH int128 public ASSETID = 0; int128 public LSTID = 1; // Parameters bool public stakeAsset = true; //if true, the strategy will try and stake/swap asset to LST uint256 public maxSingleTrade; //maximum amount that should be swapped by the keeper in one go uint256 public maxSingleWithdraw; //maximum amount that should be withdrawn in one go uint256 public swapSlippage; //actual slippage for a trade uint256 public bufferSlippage; //pessimistic buffer to the totalAssets to simulate having to realize the LST to asset bool public open = true; //bool if the strategy is open for any depositors. mapping(address => bool) public allowed; //mapping of addresses allowed to deposit. uint256 internal constant WAD = 1e18; uint256 internal constant ASSET_DUST = 1000; address internal constant GOV = 0xFEB4acf3df3cDEA7399794D0869ef76A6EfAff52; //yearn governance constructor(address _asset, string memory _name) BaseHealthCheck(_asset, _name) { //approvals: ERC20(_asset).safeApprove(curve, type(uint256).max); ERC20(LST).safeApprove(curve, type(uint256).max); ERC20(LST).safeApprove(withdrawalQueueLST, type(uint256).max); maxSingleTrade = 1000 * 1e18; //maximum amount that should be swapped by the keeper in one go maxSingleWithdraw = 1000 * 1e18; //maximum amount that should be withdrawn in one go swapSlippage = 50; //actual slippage for a trade bufferSlippage = 50; //pessimistic correction to the totalAssets to simulate having to realize the LST to asset and thus virtually create a buffer for swapping } receive() external payable {} /*////////////////////////////////////////////////////////////// INTERNAL //////////////////////////////////////////////////////////////*/ function _deployFunds(uint256 _amount) internal override { if (stakeAsset) { _stake(_amount); } } function _LSTprice() internal view returns (uint256 LSTprice) { (, int256 answer, , uint256 updatedAt, ) = chainlinkOracle.latestRoundData(); LSTprice = uint256(answer); require((LSTprice > 1 && block.timestamp - updatedAt < chainlinkHeartbeat), "!chainlink"); } function _stake(uint256 _amount) internal { if (_amount < ASSET_DUST) return; IWETH(address(asset)).withdraw(_amount); //WETH --> ETH if (ICurve(curve).get_dy(ASSETID, LSTID, _amount) < _amount){ //check if we receive more than 1:1 through swaps if (!ISTETH(LST).isStakingPaused()) { //if staking is paused & unfavorable swaps, do nothing ISTETH(LST).submit{value: _amount}(GOV); //stake 1:1 } } else { ICurve(curve).exchange{value: _amount}(ASSETID, LSTID, _amount, _amount); //swap for at least 1:1 } } function availableDepositLimit(address _owner) public view override returns (uint256) { // If the owner is whitelisted or the strategy is open. if (open || allowed[_owner]) { return type(uint256).max; } else { return 0; } } function availableWithdrawLimit(address /*_owner*/) public view override returns (uint256) { return _balanceAsset() + maxSingleWithdraw; } function _freeFunds(uint256 _assetAmount) internal override { //Unstake LST amount proportional to the shares redeemed: uint256 totalAssets = TokenizedStrategy.totalAssets(); uint256 totalDebt = totalAssets - _balanceAsset(); uint256 LSTamountToUnstake = _balanceLST() * _assetAmount / totalDebt; if (LSTamountToUnstake > 2) { _unstake(LSTamountToUnstake); } } function _unstake(uint256 _amount) internal { uint256 expectedAmountOut = _amount * _LSTprice() * (MAX_BPS - swapSlippage) / WAD / MAX_BPS; //Without oracle we expect 1:1, but can offset that expectation with swapSlippage & adjust expectedAmountOut by actual depeg ICurve(curve).exchange(LSTID, ASSETID, _amount, expectedAmountOut); IWETH(address(asset)).deposit{value: address(this).balance}(); //ETH --> WETH } function _harvestAndReport() internal override returns (uint256 _totalAssets) { // invest any loose asset if (!TokenizedStrategy.isShutdown() && stakeAsset) { _stake(Math.min(maxSingleTrade, _balanceAsset())); } // Total assets of the strategy, pessimistically account for LST at a value as if it had been swapped back to asset with a virtual buffer slippage uint256 LSTbalance = _balanceLST(); _totalAssets = _balanceAsset() + LSTbalance * _getPessimisticLSTprice(LSTbalance) * (MAX_BPS - bufferSlippage) / WAD / MAX_BPS; } function _getPessimisticLSTprice(uint256 _LSTbalance) internal view returns (uint256 LSTprice) { uint256 amount = Math.min(_LSTbalance, maxSingleWithdraw); amount = Math.max(amount, WAD); //use at the very least WAD LSTprice = ICurve(curve).get_dy(LSTID, ASSETID, amount) * WAD / amount; //price estimate and fee determined through actual swap route LSTprice = Math.min(LSTprice, _LSTprice()); //use pessimistic price to make sure people cannot withdraw more than the current worth of the LST } function _balanceAsset() internal view returns (uint256) { return asset.balanceOf(address(this)); } function _balanceLST() internal view returns (uint256){ return ERC20(LST).balanceOf(address(this)); } /*////////////////////////////////////////////////////////////// EXTERNAL: //////////////////////////////////////////////////////////////*/ /// @notice Returns the amount of asset the strategy holds. function balanceAsset() external view returns (uint256) { return _balanceAsset(); } /// @notice Returns the amount of staked asset in liquid staking token (LST) the strategy holds. function balanceLST() external view returns (uint256) { return _balanceLST(); } /// @notice Set the boolean if the strategy will try and stake/swap asset to LST (true) or not (false). function setStakeAsset(bool _stakeAsset) external onlyManagement { stakeAsset = _stakeAsset; } /// @notice Set the maximum amount of asset that can be moved by keepers in a single transaction. This is to avoid unnecessarily large slippages when harvesting. function setMaxSingleTrade(uint256 _maxSingleTrade) external onlyManagement { maxSingleTrade = _maxSingleTrade; } /// @notice Set the maximum amount of asset that can be withdrawn in a single transaction. This is to avoid unnecessarily large slippages and incentivizes staggered withdrawals. function setMaxSingleWithdraw(uint256 _maxSingleWithdraw) external onlyManagement { maxSingleWithdraw = _maxSingleWithdraw; } /// @notice Set the maximum slippage in basis points (BPS) to accept when swapping asset <-> staked asset in liquid staking token (LST). function setSwapSlippage(uint256 _swapSlippage) external onlyEmergencyAuthorized { require(_swapSlippage <= MAX_BPS); swapSlippage = _swapSlippage; } /// @notice Set the buffer slippage in basis points (BPS) to pessimistically correct the totalAssets to reflect having to eventually swap LST back to asset and thus create a buffer for swaps. function setBufferSlippage(uint256 _bufferSlippage) external onlyManagement { require(_bufferSlippage <= MAX_BPS); bufferSlippage = _bufferSlippage; } // Change if anyone can deposit in or only white listed addresses function setOpen(bool _open) external onlyEmergencyAuthorized { open = _open; } // Set or update an addresses whitelist status. function setAllowed(address _address, bool _allowed) external onlyEmergencyAuthorized { allowed[_address] = _allowed; } /// @notice Set Chainlink heartbeat to determine what qualifies as stale data in units of seconds. function setChainlinkHeartbeat(uint256 _chainlinkHeartbeat) external onlyManagement { chainlinkHeartbeat = _chainlinkHeartbeat; } /*////////////////////////////////////////////////////////////// GOVERNANCE: //////////////////////////////////////////////////////////////*/ modifier onlyGovernance() { require(msg.sender == GOV, "!gov"); _; } /// @notice Set the chainlink oracle address to a new address. Only callable by governance. function setChainlinkOracle(address _chainlinkOracle) external onlyGovernance { require(_chainlinkOracle != address(0)); chainlinkOracle = AggregatorInterface(_chainlinkOracle); } /// @notice Set the curve pool address in case TVL has migrated to a new curve pool. Only callable by governance. function setCurvePool(address _curve, int128 _ASSETID, int128 _LSTID) external onlyGovernance { require(_curve != address(0)); asset.safeApprove(curve, 0); ERC20(LST).safeApprove(curve, 0); asset.safeApprove(_curve, type(uint256).max); ERC20(LST).safeApprove(_curve, type(uint256).max); curve = _curve; ASSETID = _ASSETID; LSTID = _LSTID; } /*////////////////////////////////////////////////////////////// EMERGENCY: //////////////////////////////////////////////////////////////*/ // Emergency swap LST amount. Best to do this in steps. function _emergencyWithdraw(uint256 _amount) internal override { _amount = Math.min(_amount, _balanceLST()); _unstake(_amount); } /// @notice Initiate a liquid staking token (LST) withdrawal process to redeem 1:1. Returns requestIds which can be used to claim asset into the strategy. /// @param _amounts the amounts of LST to initiate a withdrawal process for. function initiateLSTwithdrawal(uint256[] calldata _amounts) external onlyManagement returns (uint256[] memory requestIds) { requestIds = IQueue(withdrawalQueueLST).requestWithdrawals(_amounts, address(this)); } /// @notice Claim asset from a liquid staking token (LST) withdrawal process to redeem 1:1. Use the requestId from initiateLSTwithdrawal() as argument. /// @param _requestId return from calling initiateLSTwithdrawal() to identify the withdrawal. function claimLSTwithdrawal(uint256 _requestId) external onlyManagement { IQueue(withdrawalQueueLST).claimWithdrawal(_requestId); IWETH(address(asset)).deposit{value: address(this).balance}(); //ETH --> WETH } }Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"string","name":"_name","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"nonpayable","type":"fallback"},{"inputs":[],"name":"ASSETID","outputs":[{"internalType":"int128","name":"","type":"int128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LSTID","outputs":[{"internalType":"int128","name":"","type":"int128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"allowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"availableDepositLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"availableWithdrawLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balanceAsset","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balanceLST","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bufferSlippage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainlinkHeartbeat","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainlinkOracle","outputs":[{"internalType":"contract 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"","type":"bool"},{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenizedStrategyAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000011737445544820616363756d756c61746f72000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _asset (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : _name (string): stETH accumulator
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000011
Arg [3] : 737445544820616363756d756c61746f72000000000000000000000000000000Deployed Bytecode Sourcemap
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Swarm Source
ipfs://02bd38baa078029d7e343929654e769ce3e410ef76f202a821307663646eeab7
Loading...LoadingLoading...LoadingLoading...Loading[ Download: CSV Export ][ Download: CSV Export ]A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.
