ERC-20
DeFi
Overview
Max Total Supply
65,174,635.833248870693166176 sFRAX
Holders
306 (0.00%)
Market
Price
$1.09 @ 0.000326 ETH (+0.49%)
Onchain Market Cap
$71,105,527.69
Circulating Supply Market Cap
$3,934,325.00
Other Info
Token Contract (WITH 18 Decimals)
Filtered by Token Holder
Swell Network: Simple Staking ERC20Balance
10.79 sFRAXValue
$11.77 ( ~0.00351748392706948 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
StakedFrax
Compiler Version
v0.8.21+commit.d9974bed
Optimization Enabled:
Yes with 99999999 runs
Other Settings:
london EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.21; // ==================================================================== // | ______ _______ | // | / _____________ __ __ / ____(_____ ____ _____ ________ | // | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ | // | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ | // | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ | // | | // ==================================================================== // ============================ StakedFrax ============================ // ==================================================================== // Frax Finance: https://github.com/FraxFinance import { Timelock2Step } from "frax-std/access-control/v2/Timelock2Step.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import { SafeCastLib } from "solmate/utils/SafeCastLib.sol"; import { LinearRewardsErc4626, ERC20 } from "./LinearRewardsErc4626.sol"; /// @title Staked Frax /// @notice A ERC4626 Vault implementation with linear rewards, rewards can be capped contract StakedFrax is LinearRewardsErc4626, Timelock2Step { using SafeCastLib for *; /// @notice The maximum amount of rewards that can be distributed per second per 1e18 asset uint256 public maxDistributionPerSecondPerAsset; /// @param _underlying The erc20 asset deposited /// @param _name The name of the vault /// @param _symbol The symbol of the vault /// @param _rewardsCycleLength The length of the rewards cycle in seconds /// @param _maxDistributionPerSecondPerAsset The maximum amount of rewards that can be distributed per second per 1e18 asset /// @param _timelockAddress The address of the timelock/owner contract constructor( IERC20 _underlying, string memory _name, string memory _symbol, uint32 _rewardsCycleLength, uint256 _maxDistributionPerSecondPerAsset, address _timelockAddress ) LinearRewardsErc4626(ERC20(address(_underlying)), _name, _symbol, _rewardsCycleLength) Timelock2Step(_timelockAddress) { maxDistributionPerSecondPerAsset = _maxDistributionPerSecondPerAsset; } /// @notice The ```SetMaxDistributionPerSecondPerAsset``` event is emitted when the maxDistributionPerSecondPerAsset is set /// @param oldMax The old maxDistributionPerSecondPerAsset value /// @param newMax The new maxDistributionPerSecondPerAsset value event SetMaxDistributionPerSecondPerAsset(uint256 oldMax, uint256 newMax); /// @notice The ```setMaxDistributionPerSecondPerAsset``` function sets the maxDistributionPerSecondPerAsset /// @dev This function can only be called by the timelock, caps the value to type(uint64).max /// @param _maxDistributionPerSecondPerAsset The maximum amount of rewards that can be distributed per second per 1e18 asset function setMaxDistributionPerSecondPerAsset(uint256 _maxDistributionPerSecondPerAsset) external { _requireSenderIsTimelock(); syncRewardsAndDistribution(); // NOTE: prevents bricking the contract via overflow if (_maxDistributionPerSecondPerAsset > type(uint64).max) { _maxDistributionPerSecondPerAsset = type(uint64).max; } emit SetMaxDistributionPerSecondPerAsset({ oldMax: maxDistributionPerSecondPerAsset, newMax: _maxDistributionPerSecondPerAsset }); maxDistributionPerSecondPerAsset = _maxDistributionPerSecondPerAsset; } /// @notice The ```calculateRewardsToDistribute``` function calculates the amount of rewards to distribute based on the rewards cycle data and the time passed /// @param _rewardsCycleData The rewards cycle data /// @param _deltaTime The time passed since the last rewards distribution /// @return _rewardToDistribute The amount of rewards to distribute function calculateRewardsToDistribute( RewardsCycleData memory _rewardsCycleData, uint256 _deltaTime ) public view override returns (uint256 _rewardToDistribute) { _rewardToDistribute = super.calculateRewardsToDistribute({ _rewardsCycleData: _rewardsCycleData, _deltaTime: _deltaTime }); // Cap rewards uint256 _maxDistribution = (maxDistributionPerSecondPerAsset * _deltaTime * storedTotalAssets) / PRECISION; if (_rewardToDistribute > _maxDistribution) { _rewardToDistribute = _maxDistribution; } } }
// SPDX-License-Identifier: ISC pragma solidity >=0.8.0; // ==================================================================== // | ______ _______ | // | / _____________ __ __ / ____(_____ ____ _____ ________ | // | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ | // | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ | // | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ | // | | // ==================================================================== // ========================== Timelock2Step =========================== // ==================================================================== // Frax Finance: https://github.com/FraxFinance // Primary Author // Drake Evans: https://github.com/DrakeEvans // Reviewers // Dennis: https://github.com/denett // ==================================================================== /// @title Timelock2Step /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @dev Inspired by OpenZeppelin's Ownable2Step contract /// @notice An abstract contract which contains 2-step transfer and renounce logic for a timelock address abstract contract Timelock2Step { /// @notice The pending timelock address address public pendingTimelockAddress; /// @notice The current timelock address address public timelockAddress; constructor(address _timelockAddress) { timelockAddress = _timelockAddress; } // ============================================================================================ // Functions: External Functions // ============================================================================================ /// @notice The ```transferTimelock``` function initiates the timelock transfer /// @dev Must be called by the current timelock /// @param _newTimelock The address of the nominated (pending) timelock function transferTimelock(address _newTimelock) external virtual { _requireSenderIsTimelock(); _transferTimelock(_newTimelock); } /// @notice The ```acceptTransferTimelock``` function completes the timelock transfer /// @dev Must be called by the pending timelock function acceptTransferTimelock() external virtual { _requireSenderIsPendingTimelock(); _acceptTransferTimelock(); } /// @notice The ```renounceTimelock``` function renounces the timelock after setting pending timelock to current timelock /// @dev Pending timelock must be set to current timelock before renouncing, creating a 2-step renounce process function renounceTimelock() external virtual { _requireSenderIsTimelock(); _requireSenderIsPendingTimelock(); _transferTimelock(address(0)); _setTimelock(address(0)); } // ============================================================================================ // Functions: Internal Actions // ============================================================================================ /// @notice The ```_transferTimelock``` function initiates the timelock transfer /// @dev This function is to be implemented by a public function /// @param _newTimelock The address of the nominated (pending) timelock function _transferTimelock(address _newTimelock) internal { pendingTimelockAddress = _newTimelock; emit TimelockTransferStarted(timelockAddress, _newTimelock); } /// @notice The ```_acceptTransferTimelock``` function completes the timelock transfer /// @dev This function is to be implemented by a public function function _acceptTransferTimelock() internal { pendingTimelockAddress = address(0); _setTimelock(msg.sender); } /// @notice The ```_setTimelock``` function sets the timelock address /// @dev This function is to be implemented by a public function /// @param _newTimelock The address of the new timelock function _setTimelock(address _newTimelock) internal { emit TimelockTransferred(timelockAddress, _newTimelock); timelockAddress = _newTimelock; } // ============================================================================================ // Functions: Internal Checks // ============================================================================================ /// @notice The ```_isTimelock``` function checks if _address is current timelock address /// @param _address The address to check against the timelock /// @return Whether or not msg.sender is current timelock address function _isTimelock(address _address) internal view returns (bool) { return _address == timelockAddress; } /// @notice The ```_requireIsTimelock``` function reverts if _address is not current timelock address /// @param _address The address to check against the timelock function _requireIsTimelock(address _address) internal view { if (!_isTimelock(_address)) revert AddressIsNotTimelock(timelockAddress, _address); } /// @notice The ```_requireSenderIsTimelock``` function reverts if msg.sender is not current timelock address /// @dev This function is to be implemented by a public function function _requireSenderIsTimelock() internal view { _requireIsTimelock(msg.sender); } /// @notice The ```_isPendingTimelock``` function checks if the _address is pending timelock address /// @dev This function is to be implemented by a public function /// @param _address The address to check against the pending timelock /// @return Whether or not _address is pending timelock address function _isPendingTimelock(address _address) internal view returns (bool) { return _address == pendingTimelockAddress; } /// @notice The ```_requireIsPendingTimelock``` function reverts if the _address is not pending timelock address /// @dev This function is to be implemented by a public function /// @param _address The address to check against the pending timelock function _requireIsPendingTimelock(address _address) internal view { if (!_isPendingTimelock(_address)) revert AddressIsNotPendingTimelock(pendingTimelockAddress, _address); } /// @notice The ```_requirePendingTimelock``` function reverts if msg.sender is not pending timelock address /// @dev This function is to be implemented by a public function function _requireSenderIsPendingTimelock() internal view { _requireIsPendingTimelock(msg.sender); } // ============================================================================================ // Functions: Events // ============================================================================================ /// @notice The ```TimelockTransferStarted``` event is emitted when the timelock transfer is initiated /// @param previousTimelock The address of the previous timelock /// @param newTimelock The address of the new timelock event TimelockTransferStarted(address indexed previousTimelock, address indexed newTimelock); /// @notice The ```TimelockTransferred``` event is emitted when the timelock transfer is completed /// @param previousTimelock The address of the previous timelock /// @param newTimelock The address of the new timelock event TimelockTransferred(address indexed previousTimelock, address indexed newTimelock); // ============================================================================================ // Functions: Errors // ============================================================================================ /// @notice Emitted when timelock is transferred error AddressIsNotTimelock(address timelockAddress, address actualAddress); /// @notice Emitted when pending timelock is transferred error AddressIsNotPendingTimelock(address pendingTimelockAddress, address actualAddress); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @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 {} }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Safe unsigned integer casting library that reverts on overflow. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeCastLib.sol) /// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeCast.sol) library SafeCastLib { function safeCastTo248(uint256 x) internal pure returns (uint248 y) { require(x < 1 << 248); y = uint248(x); } function safeCastTo240(uint256 x) internal pure returns (uint240 y) { require(x < 1 << 240); y = uint240(x); } function safeCastTo232(uint256 x) internal pure returns (uint232 y) { require(x < 1 << 232); y = uint232(x); } function safeCastTo224(uint256 x) internal pure returns (uint224 y) { require(x < 1 << 224); y = uint224(x); } function safeCastTo216(uint256 x) internal pure returns (uint216 y) { require(x < 1 << 216); y = uint216(x); } function safeCastTo208(uint256 x) internal pure returns (uint208 y) { require(x < 1 << 208); y = uint208(x); } function safeCastTo200(uint256 x) internal pure returns (uint200 y) { require(x < 1 << 200); y = uint200(x); } function safeCastTo192(uint256 x) internal pure returns (uint192 y) { require(x < 1 << 192); y = uint192(x); } function safeCastTo184(uint256 x) internal pure returns (uint184 y) { require(x < 1 << 184); y = uint184(x); } function safeCastTo176(uint256 x) internal pure returns (uint176 y) { require(x < 1 << 176); y = uint176(x); } function safeCastTo168(uint256 x) internal pure returns (uint168 y) { require(x < 1 << 168); y = uint168(x); } function safeCastTo160(uint256 x) internal pure returns (uint160 y) { require(x < 1 << 160); y = uint160(x); } function safeCastTo152(uint256 x) internal pure returns (uint152 y) { require(x < 1 << 152); y = uint152(x); } function safeCastTo144(uint256 x) internal pure returns (uint144 y) { require(x < 1 << 144); y = uint144(x); } function safeCastTo136(uint256 x) internal pure returns (uint136 y) { require(x < 1 << 136); y = uint136(x); } function safeCastTo128(uint256 x) internal pure returns (uint128 y) { require(x < 1 << 128); y = uint128(x); } function safeCastTo120(uint256 x) internal pure returns (uint120 y) { require(x < 1 << 120); y = uint120(x); } function safeCastTo112(uint256 x) internal pure returns (uint112 y) { require(x < 1 << 112); y = uint112(x); } function safeCastTo104(uint256 x) internal pure returns (uint104 y) { require(x < 1 << 104); y = uint104(x); } function safeCastTo96(uint256 x) internal pure returns (uint96 y) { require(x < 1 << 96); y = uint96(x); } function safeCastTo88(uint256 x) internal pure returns (uint88 y) { require(x < 1 << 88); y = uint88(x); } function safeCastTo80(uint256 x) internal pure returns (uint80 y) { require(x < 1 << 80); y = uint80(x); } function safeCastTo72(uint256 x) internal pure returns (uint72 y) { require(x < 1 << 72); y = uint72(x); } function safeCastTo64(uint256 x) internal pure returns (uint64 y) { require(x < 1 << 64); y = uint64(x); } function safeCastTo56(uint256 x) internal pure returns (uint56 y) { require(x < 1 << 56); y = uint56(x); } function safeCastTo48(uint256 x) internal pure returns (uint48 y) { require(x < 1 << 48); y = uint48(x); } function safeCastTo40(uint256 x) internal pure returns (uint40 y) { require(x < 1 << 40); y = uint40(x); } function safeCastTo32(uint256 x) internal pure returns (uint32 y) { require(x < 1 << 32); y = uint32(x); } function safeCastTo24(uint256 x) internal pure returns (uint24 y) { require(x < 1 << 24); y = uint24(x); } function safeCastTo16(uint256 x) internal pure returns (uint16 y) { require(x < 1 << 16); y = uint16(x); } function safeCastTo8(uint256 x) internal pure returns (uint8 y) { require(x < 1 << 8); y = uint8(x); } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.21; // ==================================================================== // | ______ _______ | // | / _____________ __ __ / ____(_____ ____ _____ ________ | // | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ | // | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ | // | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ | // | | // ==================================================================== // ======================== LinearRewardsErc4626 ====================== // ==================================================================== // Frax Finance: https://github.com/FraxFinance import { ERC20, ERC4626 } from "solmate/mixins/ERC4626.sol"; import { SafeCastLib } from "solmate/utils/SafeCastLib.sol"; /// @title LinearRewardsErc4626 /// @notice An ERC4626 Vault implementation with linear rewards abstract contract LinearRewardsErc4626 is ERC4626 { using SafeCastLib for *; /// @notice The precision of all integer calculations uint256 public constant PRECISION = 1e18; /// @notice The rewards cycle length in seconds uint256 public immutable REWARDS_CYCLE_LENGTH; /// @notice Information about the current rewards cycle struct RewardsCycleData { uint40 cycleEnd; // Timestamp of the end of the current rewards cycle uint40 lastSync; // Timestamp of the last time the rewards cycle was synced uint216 rewardCycleAmount; // Amount of rewards to be distributed in the current cycle } /// @notice The rewards cycle data, stored in a single word to save gas RewardsCycleData public rewardsCycleData; /// @notice The timestamp of the last time rewards were distributed uint256 public lastRewardsDistribution; /// @notice The total amount of assets that have been distributed and deposited uint256 public storedTotalAssets; /// @notice The precision of the underlying asset uint256 public immutable UNDERLYING_PRECISION; /// @param _underlying The erc20 asset deposited /// @param _name The name of the vault /// @param _symbol The symbol of the vault /// @param _rewardsCycleLength The length of the rewards cycle in seconds constructor( ERC20 _underlying, string memory _name, string memory _symbol, uint256 _rewardsCycleLength ) ERC4626(_underlying, _name, _symbol) { REWARDS_CYCLE_LENGTH = _rewardsCycleLength; UNDERLYING_PRECISION = 10 ** _underlying.decimals(); // initialize rewardsCycleEnd value // NOTE: normally distribution of rewards should be done prior to _syncRewards but in this case we know there are no users or rewards yet. _syncRewards(); // initialize lastRewardsDistribution value _distributeRewards(); } function pricePerShare() external view returns (uint256 _pricePerShare) { _pricePerShare = convertToAssets(UNDERLYING_PRECISION); } /// @notice The ```calculateRewardsToDistribute``` function calculates the amount of rewards to distribute based on the rewards cycle data and the time elapsed /// @param _rewardsCycleData The rewards cycle data /// @param _deltaTime The time elapsed since the last rewards distribution /// @return _rewardToDistribute The amount of rewards to distribute function calculateRewardsToDistribute( RewardsCycleData memory _rewardsCycleData, uint256 _deltaTime ) public view virtual returns (uint256 _rewardToDistribute) { _rewardToDistribute = (_rewardsCycleData.rewardCycleAmount * _deltaTime) / (_rewardsCycleData.cycleEnd - _rewardsCycleData.lastSync); } /// @notice The ```previewDistributeRewards``` function is used to preview the rewards distributed at the top of the block /// @return _rewardToDistribute The amount of underlying to distribute function previewDistributeRewards() public view virtual returns (uint256 _rewardToDistribute) { // Cache state for gas savings RewardsCycleData memory _rewardsCycleData = rewardsCycleData; uint256 _lastRewardsDistribution = lastRewardsDistribution; uint40 _timestamp = block.timestamp.safeCastTo40(); // Calculate the delta time, but only include up to the cycle end in case we are passed it uint256 _deltaTime = _timestamp > _rewardsCycleData.cycleEnd ? _rewardsCycleData.cycleEnd - _lastRewardsDistribution : _timestamp - _lastRewardsDistribution; // Calculate the rewards to distribute _rewardToDistribute = calculateRewardsToDistribute({ _rewardsCycleData: _rewardsCycleData, _deltaTime: _deltaTime }); } /// @notice The ```distributeRewards``` function distributes the rewards once per block /// @return _rewardToDistribute The amount of underlying to distribute function _distributeRewards() internal virtual returns (uint256 _rewardToDistribute) { _rewardToDistribute = previewDistributeRewards(); // Only write to state/emit if we actually distribute rewards if (_rewardToDistribute != 0) { storedTotalAssets += _rewardToDistribute; emit DistributeRewards({ rewardsToDistribute: _rewardToDistribute }); } lastRewardsDistribution = block.timestamp; } /// @notice The ```previewSyncRewards``` function returns the updated rewards cycle data without updating the state /// @return _newRewardsCycleData The updated rewards cycle data function previewSyncRewards() public view virtual returns (RewardsCycleData memory _newRewardsCycleData) { RewardsCycleData memory _rewardsCycleData = rewardsCycleData; uint256 _timestamp = block.timestamp; // Only sync if the previous cycle has ended if (_timestamp <= _rewardsCycleData.cycleEnd) return _rewardsCycleData; // Calculate rewards for next cycle uint256 _newRewards = asset.balanceOf(address(this)) - storedTotalAssets; // Calculate the next cycle end, this keeps cycles at the same time regardless of when sync is called uint40 _cycleEnd = (((_timestamp + REWARDS_CYCLE_LENGTH) / REWARDS_CYCLE_LENGTH) * REWARDS_CYCLE_LENGTH) .safeCastTo40(); // This block prevents big jumps in rewards rate in case the sync happens near the end of the cycle if (_cycleEnd - _timestamp < REWARDS_CYCLE_LENGTH / 40) { _cycleEnd += REWARDS_CYCLE_LENGTH.safeCastTo40(); } // Write return values _rewardsCycleData.rewardCycleAmount = _newRewards.safeCastTo216(); _rewardsCycleData.lastSync = _timestamp.safeCastTo40(); _rewardsCycleData.cycleEnd = _cycleEnd; return _rewardsCycleData; } /// @notice The ```_syncRewards``` function is used to update the rewards cycle data function _syncRewards() internal virtual { RewardsCycleData memory _rewardsCycleData = previewSyncRewards(); if ( block .timestamp // If true, then preview shows a rewards should be processed .safeCastTo40() == _rewardsCycleData.lastSync && // Ensures that we don't write to state twice in the same block rewardsCycleData.lastSync != _rewardsCycleData.lastSync ) { rewardsCycleData = _rewardsCycleData; emit SyncRewards({ cycleEnd: _rewardsCycleData.cycleEnd, lastSync: _rewardsCycleData.lastSync, rewardCycleAmount: _rewardsCycleData.rewardCycleAmount }); } } /// @notice The ```syncRewardsAndDistribution``` function is used to update the rewards cycle data and distribute rewards /// @dev rewards must be distributed before the cycle is synced function syncRewardsAndDistribution() public virtual { _distributeRewards(); _syncRewards(); } /// @notice The ```totalAssets``` function returns the total assets available in the vault /// @dev This function simulates the rewards that will be distributed at the top of the block /// @return _totalAssets The total assets available in the vault function totalAssets() public view virtual override returns (uint256 _totalAssets) { uint256 _rewardToDistribute = previewDistributeRewards(); _totalAssets = storedTotalAssets + _rewardToDistribute; } function afterDeposit(uint256 amount, uint256 shares) internal virtual override { storedTotalAssets += amount; } /// @notice The ```deposit``` function allows a user to mint shares by depositing underlying /// @param _assets The amount of underlying to deposit /// @param _receiver The address to send the shares to /// @return _shares The amount of shares minted function deposit(uint256 _assets, address _receiver) public override returns (uint256 _shares) { syncRewardsAndDistribution(); _shares = super.deposit({ assets: _assets, receiver: _receiver }); } /// @notice The ```mint``` function allows a user to mint a given number of shares /// @param _shares The amount of shares to mint /// @param _receiver The address to send the shares to /// @return _assets The amount of underlying deposited function mint(uint256 _shares, address _receiver) public override returns (uint256 _assets) { syncRewardsAndDistribution(); _assets = super.mint({ shares: _shares, receiver: _receiver }); } function beforeWithdraw(uint256 amount, uint256 shares) internal virtual override { storedTotalAssets -= amount; } /// @notice The ```withdraw``` function allows a user to withdraw a given amount of underlying /// @param _assets The amount of underlying to withdraw /// @param _receiver The address to send the underlying to /// @param _owner The address of the owner of the shares /// @return _shares The amount of shares burned function withdraw(uint256 _assets, address _receiver, address _owner) public override returns (uint256 _shares) { syncRewardsAndDistribution(); _shares = super.withdraw({ assets: _assets, receiver: _receiver, owner: _owner }); } /// @notice The ```redeem``` function allows a user to redeem their shares for underlying /// @param _shares The amount of shares to redeem /// @param _receiver The address to send the underlying to /// @param _owner The address of the owner of the shares /// @return _assets The amount of underlying redeemed function redeem(uint256 _shares, address _receiver, address _owner) public override returns (uint256 _assets) { syncRewardsAndDistribution(); _assets = super.redeem({ shares: _shares, receiver: _receiver, owner: _owner }); } /// @notice The ```depositWithSignature``` function allows a user to use signed approvals to deposit /// @param _assets The amount of underlying to deposit /// @param _receiver The address to send the shares to /// @param _deadline The deadline for the signature /// @param _approveMax Whether or not to approve the maximum amount /// @param _v The v value of the signature /// @param _r The r value of the signature /// @param _s The s value of the signature /// @return _shares The amount of shares minted function depositWithSignature( uint256 _assets, address _receiver, uint256 _deadline, bool _approveMax, uint8 _v, bytes32 _r, bytes32 _s ) external returns (uint256 _shares) { uint256 _amount = _approveMax ? type(uint256).max : _assets; asset.permit({ owner: msg.sender, spender: address(this), value: _amount, deadline: _deadline, v: _v, r: _r, s: _s }); _shares = (deposit({ _assets: _assets, _receiver: _receiver })); } //============================================================================== // Events //============================================================================== /// @notice The ```SyncRewards``` event is emitted when the rewards cycle is synced /// @param cycleEnd The timestamp of the end of the current rewards cycle /// @param lastSync The timestamp of the last time the rewards cycle was synced /// @param rewardCycleAmount The amount of rewards to be distributed in the current cycle event SyncRewards(uint40 cycleEnd, uint40 lastSync, uint216 rewardCycleAmount); /// @notice The ```DistributeRewards``` event is emitted when rewards are distributed to storedTotalAssets /// @param rewardsToDistribute The amount of rewards that were distributed event DistributeRewards(uint256 rewardsToDistribute); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @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; } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; import {ERC20} from "../tokens/ERC20.sol"; import {SafeTransferLib} from "../utils/SafeTransferLib.sol"; import {FixedPointMathLib} from "../utils/FixedPointMathLib.sol"; /// @notice Minimal ERC4626 tokenized Vault implementation. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/mixins/ERC4626.sol) abstract contract ERC4626 is ERC20 { using SafeTransferLib for ERC20; using FixedPointMathLib for uint256; /*////////////////////////////////////////////////////////////// EVENTS //////////////////////////////////////////////////////////////*/ event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares); event Withdraw( address indexed caller, address indexed receiver, address indexed owner, uint256 assets, uint256 shares ); /*////////////////////////////////////////////////////////////// IMMUTABLES //////////////////////////////////////////////////////////////*/ ERC20 public immutable asset; constructor( ERC20 _asset, string memory _name, string memory _symbol ) ERC20(_name, _symbol, _asset.decimals()) { asset = _asset; } /*////////////////////////////////////////////////////////////// DEPOSIT/WITHDRAWAL LOGIC //////////////////////////////////////////////////////////////*/ function deposit(uint256 assets, address receiver) public virtual returns (uint256 shares) { // Check for rounding error since we round down in previewDeposit. require((shares = previewDeposit(assets)) != 0, "ZERO_SHARES"); // Need to transfer before minting or ERC777s could reenter. asset.safeTransferFrom(msg.sender, address(this), assets); _mint(receiver, shares); emit Deposit(msg.sender, receiver, assets, shares); afterDeposit(assets, shares); } function mint(uint256 shares, address receiver) public virtual returns (uint256 assets) { assets = previewMint(shares); // No need to check for rounding error, previewMint rounds up. // Need to transfer before minting or ERC777s could reenter. asset.safeTransferFrom(msg.sender, address(this), assets); _mint(receiver, shares); emit Deposit(msg.sender, receiver, assets, shares); afterDeposit(assets, shares); } function withdraw( uint256 assets, address receiver, address owner ) public virtual returns (uint256 shares) { shares = previewWithdraw(assets); // No need to check for rounding error, previewWithdraw rounds up. if (msg.sender != owner) { uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals. if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares; } beforeWithdraw(assets, shares); _burn(owner, shares); emit Withdraw(msg.sender, receiver, owner, assets, shares); asset.safeTransfer(receiver, assets); } function redeem( uint256 shares, address receiver, address owner ) public virtual returns (uint256 assets) { if (msg.sender != owner) { uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals. if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares; } // Check for rounding error since we round down in previewRedeem. require((assets = previewRedeem(shares)) != 0, "ZERO_ASSETS"); beforeWithdraw(assets, shares); _burn(owner, shares); emit Withdraw(msg.sender, receiver, owner, assets, shares); asset.safeTransfer(receiver, assets); } /*////////////////////////////////////////////////////////////// ACCOUNTING LOGIC //////////////////////////////////////////////////////////////*/ function totalAssets() public view virtual returns (uint256); function convertToShares(uint256 assets) public view virtual returns (uint256) { uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero. return supply == 0 ? assets : assets.mulDivDown(supply, totalAssets()); } function convertToAssets(uint256 shares) public view virtual returns (uint256) { uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero. return supply == 0 ? shares : shares.mulDivDown(totalAssets(), supply); } function previewDeposit(uint256 assets) public view virtual returns (uint256) { return convertToShares(assets); } function previewMint(uint256 shares) public view virtual returns (uint256) { uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero. return supply == 0 ? shares : shares.mulDivUp(totalAssets(), supply); } function previewWithdraw(uint256 assets) public view virtual returns (uint256) { uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero. return supply == 0 ? assets : assets.mulDivUp(supply, totalAssets()); } function previewRedeem(uint256 shares) public view virtual returns (uint256) { return convertToAssets(shares); } /*////////////////////////////////////////////////////////////// DEPOSIT/WITHDRAWAL LIMIT LOGIC //////////////////////////////////////////////////////////////*/ function maxDeposit(address) public view virtual returns (uint256) { return type(uint256).max; } function maxMint(address) public view virtual returns (uint256) { return type(uint256).max; } function maxWithdraw(address owner) public view virtual returns (uint256) { return convertToAssets(balanceOf[owner]); } function maxRedeem(address owner) public view virtual returns (uint256) { return balanceOf[owner]; } /*////////////////////////////////////////////////////////////// INTERNAL HOOKS LOGIC //////////////////////////////////////////////////////////////*/ function beforeWithdraw(uint256 assets, uint256 shares) internal virtual {} function afterDeposit(uint256 assets, uint256 shares) internal virtual {} }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Modern and gas efficient ERC20 + EIP-2612 implementation. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol) /// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol) /// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it. abstract contract ERC20 { /*////////////////////////////////////////////////////////////// EVENTS //////////////////////////////////////////////////////////////*/ event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); /*////////////////////////////////////////////////////////////// METADATA STORAGE //////////////////////////////////////////////////////////////*/ string public name; string public symbol; uint8 public immutable decimals; /*////////////////////////////////////////////////////////////// ERC20 STORAGE //////////////////////////////////////////////////////////////*/ uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; /*////////////////////////////////////////////////////////////// EIP-2612 STORAGE //////////////////////////////////////////////////////////////*/ uint256 internal immutable INITIAL_CHAIN_ID; bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR; mapping(address => uint256) public nonces; /*////////////////////////////////////////////////////////////// CONSTRUCTOR //////////////////////////////////////////////////////////////*/ constructor( string memory _name, string memory _symbol, uint8 _decimals ) { name = _name; symbol = _symbol; decimals = _decimals; INITIAL_CHAIN_ID = block.chainid; INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator(); } /*////////////////////////////////////////////////////////////// ERC20 LOGIC //////////////////////////////////////////////////////////////*/ function approve(address spender, uint256 amount) public virtual returns (bool) { allowance[msg.sender][spender] = amount; emit Approval(msg.sender, spender, amount); return true; } function transfer(address to, uint256 amount) public virtual returns (bool) { balanceOf[msg.sender] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(msg.sender, to, amount); return true; } function transferFrom( address from, address to, uint256 amount ) public virtual returns (bool) { uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals. if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount; balanceOf[from] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(from, to, amount); return true; } /*////////////////////////////////////////////////////////////// EIP-2612 LOGIC //////////////////////////////////////////////////////////////*/ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual { require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED"); // Unchecked because the only math done is incrementing // the owner's nonce which cannot realistically overflow. unchecked { address recoveredAddress = ecrecover( keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR(), keccak256( abi.encode( keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ), owner, spender, value, nonces[owner]++, deadline ) ) ) ), v, r, s ); require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER"); allowance[recoveredAddress][spender] = value; } emit Approval(owner, spender, value); } function DOMAIN_SEPARATOR() public view virtual returns (bytes32) { return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator(); } function computeDomainSeparator() internal view virtual returns (bytes32) { return keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256("1"), block.chainid, address(this) ) ); } /*////////////////////////////////////////////////////////////// INTERNAL MINT/BURN LOGIC //////////////////////////////////////////////////////////////*/ function _mint(address to, uint256 amount) internal virtual { totalSupply += amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(address(0), to, amount); } function _burn(address from, uint256 amount) internal virtual { balanceOf[from] -= amount; // Cannot underflow because a user's balance // will never be larger than the total supply. unchecked { totalSupply -= amount; } emit Transfer(from, address(0), amount); } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; import {ERC20} from "../tokens/ERC20.sol"; /// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol) /// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer. /// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller. library SafeTransferLib { /*////////////////////////////////////////////////////////////// ETH OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferETH(address to, uint256 amount) internal { bool success; /// @solidity memory-safe-assembly assembly { // Transfer the ETH and store if it succeeded or not. success := call(gas(), to, amount, 0, 0, 0, 0) } require(success, "ETH_TRANSFER_FAILED"); } /*////////////////////////////////////////////////////////////// ERC20 OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferFrom( ERC20 token, address from, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "from" argument. mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument. mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 100, 0, 32) ) } require(success, "TRANSFER_FROM_FAILED"); } function safeTransfer( ERC20 token, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 68, 0, 32) ) } require(success, "TRANSFER_FAILED"); } function safeApprove( ERC20 token, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 68, 0, 32) ) } require(success, "APPROVE_FAILED"); } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Arithmetic library with operations for fixed-point numbers. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol) /// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol) library FixedPointMathLib { /*////////////////////////////////////////////////////////////// SIMPLIFIED FIXED POINT OPERATIONS //////////////////////////////////////////////////////////////*/ uint256 internal constant MAX_UINT256 = 2**256 - 1; uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s. function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) { return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down. } function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) { return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up. } function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) { return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down. } function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) { return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up. } /*////////////////////////////////////////////////////////////// LOW LEVEL FIXED POINT OPERATIONS //////////////////////////////////////////////////////////////*/ function mulDivDown( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y)) if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) { revert(0, 0) } // Divide x * y by the denominator. z := div(mul(x, y), denominator) } } function mulDivUp( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y)) if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) { revert(0, 0) } // If x * y modulo the denominator is strictly greater than 0, // 1 is added to round up the division of x * y by the denominator. z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator)) } } function rpow( uint256 x, uint256 n, uint256 scalar ) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { switch x case 0 { switch n case 0 { // 0 ** 0 = 1 z := scalar } default { // 0 ** n = 0 z := 0 } } default { switch mod(n, 2) case 0 { // If n is even, store scalar in z for now. z := scalar } default { // If n is odd, store x in z for now. z := x } // Shifting right by 1 is like dividing by 2. let half := shr(1, scalar) for { // Shift n right by 1 before looping to halve it. n := shr(1, n) } n { // Shift n right by 1 each iteration to halve it. n := shr(1, n) } { // Revert immediately if x ** 2 would overflow. // Equivalent to iszero(eq(div(xx, x), x)) here. if shr(128, x) { revert(0, 0) } // Store x squared. let xx := mul(x, x) // Round to the nearest number. let xxRound := add(xx, half) // Revert if xx + half overflowed. if lt(xxRound, xx) { revert(0, 0) } // Set x to scaled xxRound. x := div(xxRound, scalar) // If n is even: if mod(n, 2) { // Compute z * x. let zx := mul(z, x) // If z * x overflowed: if iszero(eq(div(zx, x), z)) { // Revert if x is non-zero. if iszero(iszero(x)) { revert(0, 0) } } // Round to the nearest number. let zxRound := add(zx, half) // Revert if zx + half overflowed. if lt(zxRound, zx) { revert(0, 0) } // Return properly scaled zxRound. z := div(zxRound, scalar) } } } } } /*////////////////////////////////////////////////////////////// GENERAL NUMBER UTILITIES //////////////////////////////////////////////////////////////*/ function sqrt(uint256 x) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { let y := x // We start y at x, which will help us make our initial estimate. z := 181 // The "correct" value is 1, but this saves a multiplication later. // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically. // We check y >= 2^(k + 8) but shift right by k bits // each branch to ensure that if x >= 256, then y >= 256. if iszero(lt(y, 0x10000000000000000000000000000000000)) { y := shr(128, y) z := shl(64, z) } if iszero(lt(y, 0x1000000000000000000)) { y := shr(64, y) z := shl(32, z) } if iszero(lt(y, 0x10000000000)) { y := shr(32, y) z := shl(16, z) } if iszero(lt(y, 0x1000000)) { y := shr(16, y) z := shl(8, z) } // Goal was to get z*z*y within a small factor of x. More iterations could // get y in a tighter range. Currently, we will have y in [256, 256*2^16). // We ensured y >= 256 so that the relative difference between y and y+1 is small. // That's not possible if x < 256 but we can just verify those cases exhaustively. // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256. // Correctness can be checked exhaustively for x < 256, so we assume y >= 256. // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps. // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256. // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18. // There is no overflow risk here since y < 2^136 after the first branch above. z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181. // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough. z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) z := shr(1, add(z, div(x, z))) // If x+1 is a perfect square, the Babylonian method cycles between // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor. // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case. // If you don't care whether the floor or ceil square root is returned, you can remove this statement. z := sub(z, lt(div(x, z), z)) } } function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { // Mod x by y. Note this will return // 0 instead of reverting if y is zero. z := mod(x, y) } } function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) { /// @solidity memory-safe-assembly assembly { // Divide x by y. Note this will return // 0 instead of reverting if y is zero. r := div(x, y) } } function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { // Add 1 to x * y if x % y > 0. Note this will // return 0 instead of reverting if y is zero. z := add(gt(mod(x, y), 0), div(x, y)) } } }
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Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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LinearRewardsErc4626.RewardsCycleData","name":"_newRewardsCycleData","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"assets","type":"uint256"}],"name":"previewWithdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pricePerShare","outputs":[{"internalType":"uint256","name":"_pricePerShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"name":"redeem","outputs":[{"internalType":"uint256","name":"_assets","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceTimelock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardsCycleData","outputs":[{"internalType":"uint40","name":"cycleEnd","type":"uint40"},{"internalType":"uint40","name":"lastSync","type":"uint40"},{"internalType":"uint216","name":"rewardCycleAmount","type":"uint216"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxDistributionPerSecondPerAsset","type":"uint256"}],"name":"setMaxDistributionPerSecondPerAsset","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"storedTotalAssets","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"syncRewardsAndDistribution","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"timelockAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAssets","outputs":[{"internalType":"uint256","name":"_totalAssets","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newTimelock","type":"address"}],"name":"transferTimelock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_assets","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _underlying (address): 0x853d955aCEf822Db058eb8505911ED77F175b99e
Arg [1] : _name (string): Staked FRAX
Arg [2] : _symbol (string): sFRAX
Arg [3] : _rewardsCycleLength (uint32): 604800
Arg [4] : _maxDistributionPerSecondPerAsset (uint256): 3022266030
Arg [5] : _timelockAddress (address): 0x831822660572bd54ebaa065C2acef662a6277D40
-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 000000000000000000000000853d955acef822db058eb8505911ed77f175b99e
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [3] : 0000000000000000000000000000000000000000000000000000000000093a80
Arg [4] : 00000000000000000000000000000000000000000000000000000000b4241eae
Arg [5] : 000000000000000000000000831822660572bd54ebaa065c2acef662a6277d40
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000b
Arg [7] : 5374616b65642046524158000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [9] : 7346524158000000000000000000000000000000000000000000000000000000
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