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Latest 25 from a total of 232,227 transactions
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Unstake | 21463441 | 32 secs ago | IN | 0 ETH | 0.0003121 | ||||
Stake | 21463436 | 1 min ago | IN | 0 ETH | 0.00045228 | ||||
Stake | 21463435 | 1 min ago | IN | 0 ETH | 0.00044112 | ||||
Unstake | 21463405 | 7 mins ago | IN | 0 ETH | 0.00024535 | ||||
Unstake | 21463400 | 8 mins ago | IN | 0 ETH | 0.00030669 | ||||
Withdraw | 21463380 | 12 mins ago | IN | 0 ETH | 0.00041388 | ||||
Withdraw | 21463364 | 16 mins ago | IN | 0 ETH | 0.00041128 | ||||
Withdraw | 21463353 | 18 mins ago | IN | 0 ETH | 0.00032972 | ||||
Unstake | 21463350 | 18 mins ago | IN | 0 ETH | 0.00028041 | ||||
Stake | 21463287 | 31 mins ago | IN | 0 ETH | 0.00031478 | ||||
Unstake | 21463268 | 35 mins ago | IN | 0 ETH | 0.00031494 | ||||
Withdraw | 21463192 | 50 mins ago | IN | 0 ETH | 0.00033486 | ||||
Stake | 21463172 | 54 mins ago | IN | 0 ETH | 0.00034866 | ||||
Withdraw | 21463159 | 57 mins ago | IN | 0 ETH | 0.00034 | ||||
Stake | 21463125 | 1 hr ago | IN | 0 ETH | 0.00042041 | ||||
Unstake | 21463103 | 1 hr ago | IN | 0 ETH | 0.00027378 | ||||
Withdraw | 21463096 | 1 hr ago | IN | 0 ETH | 0.00037452 | ||||
Unstake | 21463094 | 1 hr ago | IN | 0 ETH | 0.00040347 | ||||
Stake | 21463088 | 1 hr ago | IN | 0 ETH | 0.0004079 | ||||
Stake | 21463038 | 1 hr ago | IN | 0 ETH | 0.00046437 | ||||
Withdraw | 21463009 | 1 hr ago | IN | 0 ETH | 0.00042356 | ||||
Stake | 21462974 | 1 hr ago | IN | 0 ETH | 0.00047686 | ||||
Stake | 21462951 | 1 hr ago | IN | 0 ETH | 0.00038609 | ||||
Stake | 21462901 | 1 hr ago | IN | 0 ETH | 0.00047528 | ||||
Withdraw | 21462898 | 1 hr ago | IN | 0 ETH | 0.00031092 |
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Contract Name:
EthenaLPStaking
Compiler Version
v0.8.20+commit.a1b79de6
Optimization Enabled:
Yes with 20000 runs
Other Settings:
shanghai EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.20; import "@openzeppelin/contracts/access/Ownable2Step.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "./interfaces/IEthenaLPStakingDefinitions.sol"; /** * @title EthenaLPStaking * @notice Allows liquidity providers in various USDe pools to stake their LP tokens * in order to earn shards toward the Ethena airdrop. There will be a series of epochs, * with certain pools eligible to stake in a given epoch. Reward computation and distribution * is handled off-chain. This contract is only used to hold the staked LP tokens with a * cooldown period on withdrawing stakes. */ contract EthenaLPStaking is Ownable2Step, IEthenaLPStakingDefinitions, ReentrancyGuard { using SafeERC20 for IERC20; // ---------------------- Constants ----------------------- /// @notice placeholder address for ETH address internal constant _ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; /// @notice the maximum cooldown period the owner can set for any LP token uint48 internal constant _MAX_COOLDOWN_PERIOD = 90 days; // ----------------------- Storage ------------------------ /// @notice tracks the current epoch uint8 public currentEpoch; /// @notice tracks all stakes, indexed by user and LP token mapping(address => mapping(address => StakeData)) public stakes; /// @notice tracks stake parameters for each LP token, indexed by LP token address mapping(address => StakeParameters) public stakeParametersByToken; // --------------------- Constructor ---------------------- constructor(address _initialOwner) { if (_initialOwner == address(0)) revert ZeroAddressException(); _transferOwnership(_initialOwner); } // ---------------------- Modifiers ----------------------- /** * @notice checks that the amount is not 0 * @param amount the amount to check */ modifier checkAmount(uint256 amount) { if (amount == 0) revert InvalidAmount(); _; } // ------------------- Owner Functions -------------------- /** * @notice owner can change epoch * @param newEpoch the new epoch */ function setEpoch(uint8 newEpoch) external onlyOwner { if (newEpoch == currentEpoch) revert InvalidEpoch(); emit NewEpoch(newEpoch, currentEpoch); currentEpoch = newEpoch; } /** * @notice owner can add/update stake parameters for a given LP token * @param token the LP token to update stake parameters for * @param epoch the epoch the token is eligible for staking * @param stakeLimit the maximum amount of LP tokens that can be staked * @param cooldown the cooldown period for withdrawing LP tokens */ function updateStakeParameters(address token, uint8 epoch, uint248 stakeLimit, uint48 cooldown) external onlyOwner { if (cooldown > _MAX_COOLDOWN_PERIOD) revert MaxCooldownExceeded(); StakeParameters storage stakeParameters = stakeParametersByToken[token]; // owner cannot modify total staked or cooling down stakeParameters.epoch = epoch; stakeParameters.stakeLimit = stakeLimit; stakeParameters.cooldown = cooldown; emit StakeParametersUpdated(token, epoch, stakeLimit, cooldown); } /** * @notice owner can rescue tokens that were accidentally sent to the contract * @param token the token to transfer * @param to the address to send the tokens to * @param amount the amount of tokens to send */ function rescueTokens(address token, address to, uint256 amount) external onlyOwner nonReentrant checkAmount(amount) { if (to == address(0)) revert ZeroAddressException(); // contract should never hold ETH if (token == _ETH_ADDRESS) { (bool success,) = to.call{value: amount}(""); if (!success) revert TransferFailed(); } else { IERC20(token).safeTransfer(to, amount); _checkInvariant(token); } emit TokensRescued(token, to, amount); } /// @notice Prevents the owner from renouncing ownership, must be transferred in 2 steps function renounceOwnership() public view override onlyOwner { revert CantRenounceOwnership(); } // ----------------------- User Functions ------------------------ /** * @notice users can stake LP tokens to earn shards toward airdrop * @param token the LP token to stake * @param amount the amount of LP tokens to stake */ function stake(address token, uint104 amount) external nonReentrant checkAmount(amount) { StakeParameters storage stakeParameters = stakeParametersByToken[token]; // can only stake when it is the correct epoch if (currentEpoch != stakeParameters.epoch) revert InvalidEpoch(); if (stakeParameters.totalStaked + amount > stakeParameters.stakeLimit) revert StakeLimitExceeded(); stakeParameters.totalStaked += amount; stakes[msg.sender][token].stakedAmount += amount; IERC20(token).safeTransferFrom(msg.sender, address(this), amount); _checkInvariant(token); emit Stake(msg.sender, token, amount); } /** * @notice users can unstake LP tokens to initiate the cooldown period. * They will not be able to withdraw until the cooldown period has passed and do not earn rewards during this period. * @param token the LP token to unstake * @param amount the amount of LP tokens to unstake */ function unstake(address token, uint104 amount) external nonReentrant checkAmount(amount) { StakeParameters storage stakeParameters = stakeParametersByToken[token]; StakeData storage stakeData = stakes[msg.sender][token]; if (stakeData.stakedAmount < amount) revert InvalidAmount(); stakeData.stakedAmount -= amount; stakeData.coolingDownAmount += amount; stakeData.cooldownStartTimestamp = uint104(block.timestamp); stakeParameters.totalStaked -= amount; stakeParameters.totalCoolingDown += amount; _checkInvariant(token); emit Unstake(msg.sender, token, amount); } /** * @notice users can withdraw LP tokens after the cooldown period has passed * @param token the LP token to withdraw * @param amount the amount of LP tokens to withdraw */ function withdraw(address token, uint104 amount) external nonReentrant checkAmount(amount) { StakeParameters storage stakeParameters = stakeParametersByToken[token]; StakeData storage stakeData = stakes[msg.sender][token]; if (stakeData.coolingDownAmount < amount) revert InvalidAmount(); if (block.timestamp < stakeData.cooldownStartTimestamp + stakeParameters.cooldown) revert CooldownNotOver(); stakeData.coolingDownAmount -= amount; stakeParameters.totalCoolingDown -= amount; IERC20(token).safeTransfer(msg.sender, amount); _checkInvariant(token); emit Withdraw(msg.sender, token, amount); } // ----------------------- Internal Functions ------------------------ /** * @notice checks that the invariant is not broken * @param token the LP token to check * @dev the invariant is that the contract should never hold less of a token than the total staked and cooling down * @dev despite the higher gas cost of an extra sload here, we intentionally do not pass in the stake parameters * because we want to ensure that the invariant is checked against the current state of the contract */ function _checkInvariant(address token) internal view { StakeParameters storage stakeParameters = stakeParametersByToken[token]; uint256 balance = IERC20(token).balanceOf(address(this)); if (balance < stakeParameters.totalStaked + stakeParameters.totalCoolingDown) revert InvariantBroken(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol) pragma solidity ^0.8.0; import "./Ownable.sol"; /** * @dev Contract module which provides access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership} and {acceptOwnership}. * * This module is used through inheritance. It will make available all functions * from parent (Ownable). */ abstract contract Ownable2Step is Ownable { address private _pendingOwner; event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner); /** * @dev Returns the address of the pending owner. */ function pendingOwner() public view virtual returns (address) { return _pendingOwner; } /** * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one. * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual override onlyOwner { _pendingOwner = newOwner; emit OwnershipTransferStarted(owner(), newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner. * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual override { delete _pendingOwner; super._transferOwnership(newOwner); } /** * @dev The new owner accepts the ownership transfer. */ function acceptOwnership() public virtual { address sender = _msgSender(); require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner"); _transferOwnership(sender); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @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)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { _nonReentrantBefore(); _; _nonReentrantAfter(); } function _nonReentrantBefore() private { // On the first call to nonReentrant, _status will be _NOT_ENTERED require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; } function _nonReentrantAfter() private { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } /** * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a * `nonReentrant` function in the call stack. */ function _reentrancyGuardEntered() internal view returns (bool) { return _status == _ENTERED; } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.20; interface IEthenaLPStakingDefinitions { /// @notice information about staking for a particular LP token struct StakeParameters { uint8 epoch; uint248 stakeLimit; uint104 totalStaked; // total deposited and not in cooldown uint104 totalCoolingDown; uint48 cooldown; } /// @notice information about a particular stake by user and LP token struct StakeData { uint256 stakedAmount; uint152 coolingDownAmount; uint104 cooldownStartTimestamp; } /// @notice emitted when an epoch begins event NewEpoch(uint8 indexed newEpoch, uint8 indexed previousEpoch); /// @notice emitted when staking parameters are added/updated for an LP token event StakeParametersUpdated(address indexed lpToken, uint8 indexed epoch, uint248 stakeLimit, uint104 cooldown); /// @notice emitted when a user stakes event Stake(address indexed user, address indexed lpToken, uint256 amount); /// @notice emitted when a user unstakes event Unstake(address indexed user, address indexed lpToken, uint256 amount); /// @notice emitted when a user withdraws event Withdraw(address indexed user, address indexed lpToken, uint256 amount); /// @notice emitted when tokens are rescued by owner event TokensRescued(address indexed token, address indexed to, uint256 amount); /// @notice ownership cannot be renounced error CantRenounceOwnership(); /// @notice Error returned when a user tries staking more than the limit for a given token error StakeLimitExceeded(); /// @notice Error returned when staking LP token during wrong epoch error InvalidEpoch(); /// @notice zero amount or amount greater than a max such as amount staked error InvalidAmount(); /// @notice Error returned when native ETH transfer fails error TransferFailed(); /// @notice Error returned when excess balance of an LP token is less than 0 error InvariantBroken(); /// @notice Error returned when owner sets cooldown > 1 year error MaxCooldownExceeded(); /// @notice Error returned when user attempts to withdraw before cooldown period is over error CooldownNotOver(); /// @notice This error is returned if the zero address is used error ZeroAddressException(); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// 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 (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.4) (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; } function _contextSuffixLength() internal view virtual returns (uint256) { return 0; } }
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Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"_initialOwner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CantRenounceOwnership","type":"error"},{"inputs":[],"name":"CooldownNotOver","type":"error"},{"inputs":[],"name":"InvalidAmount","type":"error"},{"inputs":[],"name":"InvalidEpoch","type":"error"},{"inputs":[],"name":"InvariantBroken","type":"error"},{"inputs":[],"name":"MaxCooldownExceeded","type":"error"},{"inputs":[],"name":"StakeLimitExceeded","type":"error"},{"inputs":[],"name":"TransferFailed","type":"error"},{"inputs":[],"name":"ZeroAddressException","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"newEpoch","type":"uint8"},{"indexed":true,"internalType":"uint8","name":"previousEpoch","type":"uint8"}],"name":"NewEpoch","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"lpToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Stake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"lpToken","type":"address"},{"indexed":true,"internalType":"uint8","name":"epoch","type":"uint8"},{"indexed":false,"internalType":"uint248","name":"stakeLimit","type":"uint248"},{"indexed":false,"internalType":"uint104","name":"cooldown","type":"uint104"}],"name":"StakeParametersUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"TokensRescued","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"lpToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Unstake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"lpToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentEpoch","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"newEpoch","type":"uint8"}],"name":"setEpoch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint104","name":"amount","type":"uint104"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakeParametersByToken","outputs":[{"internalType":"uint8","name":"epoch","type":"uint8"},{"internalType":"uint248","name":"stakeLimit","type":"uint248"},{"internalType":"uint104","name":"totalStaked","type":"uint104"},{"internalType":"uint104","name":"totalCoolingDown","type":"uint104"},{"internalType":"uint48","name":"cooldown","type":"uint48"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"stakes","outputs":[{"internalType":"uint256","name":"stakedAmount","type":"uint256"},{"internalType":"uint152","name":"coolingDownAmount","type":"uint152"},{"internalType":"uint104","name":"cooldownStartTimestamp","type":"uint104"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint104","name":"amount","type":"uint104"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint8","name":"epoch","type":"uint8"},{"internalType":"uint248","name":"stakeLimit","type":"uint248"},{"internalType":"uint48","name":"cooldown","type":"uint48"}],"name":"updateStakeParameters","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint104","name":"amount","type":"uint104"}],"name":"withdraw","outputs":[],"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)
0000000000000000000000003aa3fd1b762cac519d405297ce630bed30430b00
-----Decoded View---------------
Arg [0] : _initialOwner (address): 0x3Aa3Fd1B762CaC519D405297CE630beD30430b00
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000003aa3fd1b762cac519d405297ce630bed30430b00
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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.