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Overview
ETH Balance
0 ETH
Eth Value
$0.00Token Holdings
Latest 25 from a total of 5,175 transactions
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Get Reward | 21469552 | 10 hrs ago | IN | 0 ETH | 0.00138861 | ||||
Get Reward | 21463409 | 31 hrs ago | IN | 0 ETH | 0.00105007 | ||||
Withdraw | 21463405 | 31 hrs ago | IN | 0 ETH | 0.00072433 | ||||
Get Reward | 21457361 | 2 days ago | IN | 0 ETH | 0.0016143 | ||||
Withdraw | 21457351 | 2 days ago | IN | 0 ETH | 0.00113898 | ||||
Get Reward | 21452872 | 2 days ago | IN | 0 ETH | 0.00221093 | ||||
Withdraw | 21452852 | 2 days ago | IN | 0 ETH | 0.00165449 | ||||
Withdraw | 21434892 | 5 days ago | IN | 0 ETH | 0.00161072 | ||||
Withdraw | 21422571 | 7 days ago | IN | 0 ETH | 0.0039546 | ||||
Withdraw | 21419212 | 7 days ago | IN | 0 ETH | 0.0011548 | ||||
Get Reward | 21419204 | 7 days ago | IN | 0 ETH | 0.00175902 | ||||
Withdraw | 21418507 | 7 days ago | IN | 0 ETH | 0.00151816 | ||||
Withdraw | 21416046 | 7 days ago | IN | 0 ETH | 0.00372772 | ||||
Withdraw | 21408864 | 8 days ago | IN | 0 ETH | 0.00147172 | ||||
Get Reward | 21407765 | 9 days ago | IN | 0 ETH | 0.00114894 | ||||
Withdraw | 21407762 | 9 days ago | IN | 0 ETH | 0.00095933 | ||||
Withdraw | 21405594 | 9 days ago | IN | 0 ETH | 0.001175 | ||||
Get Reward | 21405579 | 9 days ago | IN | 0 ETH | 0.00181565 | ||||
Withdraw | 21404028 | 9 days ago | IN | 0 ETH | 0.00110587 | ||||
Get Reward | 21404024 | 9 days ago | IN | 0 ETH | 0.00164479 | ||||
Withdraw | 21403113 | 9 days ago | IN | 0 ETH | 0.00116048 | ||||
Withdraw | 21398098 | 10 days ago | IN | 0 ETH | 0.00128452 | ||||
Stake | 21398083 | 10 days ago | IN | 0 ETH | 0.00174936 | ||||
Withdraw | 21396857 | 10 days ago | IN | 0 ETH | 0.00159228 | ||||
Withdraw | 21396575 | 10 days ago | IN | 0 ETH | 0.00160435 |
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Contract Name:
cvxFxsStaking
Compiler Version
v0.8.10+commit.fc410830
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; import "./interfaces/MathUtil.sol"; import "./interfaces/IBooster.sol"; import "./interfaces/IVoterProxy.sol"; import "./interfaces/IFxsDepositor.sol"; import '@openzeppelin/contracts/token/ERC20/IERC20.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; import '@openzeppelin/contracts/token/ERC20/ERC20.sol'; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; contract cvxFxsStaking is ERC20, ReentrancyGuard{ using SafeERC20 for IERC20; /* ========== STATE VARIABLES ========== */ struct Reward { uint256 periodFinish; uint256 rewardRate; uint256 lastUpdateTime; uint256 rewardPerTokenStored; } struct EarnedData { address token; uint256 amount; } address public constant vefxsProxy = address(0x59CFCD384746ec3035299D90782Be065e466800B); address public constant cvxfxs = address(0xFEEf77d3f69374f66429C91d732A244f074bdf74); address public constant fxs = address(0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0); address public constant fxsDepositor = address(0x8f55d7c21bDFf1A51AFAa60f3De7590222A3181e); //rewards address[] public rewardTokens; mapping(address => Reward) public rewardData; mapping(address => address) public rewardRedirect; // Duration that rewards are streamed over uint256 public constant rewardsDuration = 86400 * 7; // reward token -> distributor -> is approved to add rewards mapping(address => mapping(address => bool)) public rewardDistributors; // user -> reward token -> amount mapping(address => mapping(address => uint256)) public userRewardPerTokenPaid; mapping(address => mapping(address => uint256)) public rewards; /* ========== CONSTRUCTOR ========== */ constructor() ERC20( "Staked CvxFxs", "stkCvxFxs" ){ IERC20(fxs).approve(fxsDepositor,type(uint256).max); } /* ========== ADMIN CONFIGURATION ========== */ // Add a new reward token to be distributed to stakers function addReward( address _rewardsToken, address _distributor ) public onlyOwner { require(rewardData[_rewardsToken].lastUpdateTime == 0); require(_rewardsToken != cvxfxs && _rewardsToken != address(this), "invalid token"); rewardTokens.push(_rewardsToken); rewardData[_rewardsToken].lastUpdateTime = block.timestamp; rewardData[_rewardsToken].periodFinish = block.timestamp; rewardDistributors[_rewardsToken][_distributor] = true; emit RewardAdded(_rewardsToken, _distributor); } // Modify approval for an address to call notifyRewardAmount function approveRewardDistributor( address _rewardsToken, address _distributor, bool _approved ) external onlyOwner { require(rewardData[_rewardsToken].lastUpdateTime > 0); rewardDistributors[_rewardsToken][_distributor] = _approved; emit RewardDistributorApproved(_rewardsToken, _distributor); } /* ========== MUTATIVE FUNCTIONS ========== */ //deposit fxs for cvxfxs and stake function deposit(uint256 _amount, bool _lock) public nonReentrant{ require(_amount > 0, 'RewardPool : Cannot deposit 0'); //mint will call _updateReward _mint(msg.sender, _amount); //transfer fxs IERC20(fxs).safeTransferFrom(msg.sender, address(this), _amount); //deposit, cvxfxs will be returned here IFxsDepositor(fxsDepositor).deposit(_amount,_lock); emit Staked(msg.sender, _amount); } //deposit fxs for cvxfxs and stake function deposit(uint256 _amount) external{ deposit(_amount, false); } //deposit cvxfxs function stake(uint256 _amount) public nonReentrant{ require(_amount > 0, 'RewardPool : Cannot stake 0'); //mint will call _updateReward _mint(msg.sender, _amount); //pull cvxfxs IERC20(cvxfxs).safeTransferFrom(msg.sender, address(this), _amount); emit Staked(msg.sender, _amount); } //deposit all cvxfxs function stakeAll() external{ uint256 balance = IERC20(cvxfxs).balanceOf(msg.sender); stake(balance); } //deposit cvxfxs and accredit a different address function stakeFor(address _for, uint256 _amount) external nonReentrant{ require(_amount > 0, 'RewardPool : Cannot stake 0'); //give to _for //mint will call _updateReward _mint(_for, _amount); //pull from sender IERC20(cvxfxs).safeTransferFrom(msg.sender, address(this), _amount); emit Staked(_for, _amount); } //withdraw cvxfxs function withdraw(uint256 _amount) external nonReentrant{ require(_amount > 0, 'RewardPool : Cannot withdraw 0'); //burn will call _updateReward _burn(msg.sender, _amount); //send cvxfxs IERC20(cvxfxs).safeTransfer(msg.sender, _amount); emit Withdrawn(msg.sender, _amount); } /* ========== VIEWS ========== */ function _rewardPerToken(address _rewardsToken) internal view returns(uint256) { if (totalSupply() == 0) { return rewardData[_rewardsToken].rewardPerTokenStored; } return rewardData[_rewardsToken].rewardPerTokenStored + ( (_lastTimeRewardApplicable(rewardData[_rewardsToken].periodFinish) - rewardData[_rewardsToken].lastUpdateTime) * rewardData[_rewardsToken].rewardRate * 1e18 / totalSupply() ); } function _earned( address _user, address _rewardsToken, uint256 _balance ) internal view returns(uint256) { return (_balance * (_rewardPerToken(_rewardsToken) - userRewardPerTokenPaid[_user][_rewardsToken] ) / 1e18) + rewards[_user][_rewardsToken]; } function _lastTimeRewardApplicable(uint256 _finishTime) internal view returns(uint256){ return MathUtil.min(block.timestamp, _finishTime); } function lastTimeRewardApplicable(address _rewardsToken) public view returns(uint256) { return _lastTimeRewardApplicable(rewardData[_rewardsToken].periodFinish); } function rewardPerToken(address _rewardsToken) external view returns(uint256) { return _rewardPerToken(_rewardsToken); } function getRewardForDuration(address _rewardsToken) external view returns(uint256) { return rewardData[_rewardsToken].rewardRate * rewardsDuration; } // Address and claimable amount of all reward tokens for the given account function claimableRewards(address _account) external view returns(EarnedData[] memory userRewards) { userRewards = new EarnedData[](rewardTokens.length); for (uint256 i = 0; i < userRewards.length; i++) { address token = rewardTokens[i]; userRewards[i].token = token; userRewards[i].amount = _earned(_account, token, balanceOf(_account)); } return userRewards; } //set any claimed rewards to automatically go to a different address //set address to zero to disable function setRewardRedirect(address _to) external nonReentrant{ rewardRedirect[msg.sender] = _to; emit RewardRedirected(msg.sender, _to); } // Claim all pending rewards function getReward(address _address) public nonReentrant updateReward(_address) { for (uint i; i < rewardTokens.length; i++) { address _rewardsToken = rewardTokens[i]; uint256 reward = rewards[_address][_rewardsToken]; if (reward > 0) { rewards[_address][_rewardsToken] = 0; if(rewardRedirect[_address] != address(0)){ IERC20(_rewardsToken).safeTransfer(rewardRedirect[_address], reward); }else{ IERC20(_rewardsToken).safeTransfer(_address, reward); } emit RewardPaid(_address, _rewardsToken, reward); } } } // Claim all pending rewards and forward function getReward(address _address, address _forwardTo) public nonReentrant updateReward(_address) { //if forwarding, require caller is self require(msg.sender == _address, "!self"); for (uint i; i < rewardTokens.length; i++) { address _rewardsToken = rewardTokens[i]; uint256 reward = rewards[_address][_rewardsToken]; if (reward > 0) { rewards[_address][_rewardsToken] = 0; IERC20(_rewardsToken).safeTransfer(_forwardTo, reward); emit RewardPaid(_address, _rewardsToken, reward); } } } /* ========== RESTRICTED FUNCTIONS ========== */ function rewardTokenLength() external view returns(uint256){ return rewardTokens.length; } function _notifyReward(address _rewardsToken, uint256 _reward) internal { Reward storage rdata = rewardData[_rewardsToken]; if (block.timestamp >= rdata.periodFinish) { rdata.rewardRate = _reward / rewardsDuration; } else { uint256 remaining = rdata.periodFinish - block.timestamp; uint256 leftover = remaining * rdata.rewardRate; rdata.rewardRate = (_reward + leftover) / rewardsDuration; } rdata.lastUpdateTime = block.timestamp; rdata.periodFinish = block.timestamp + rewardsDuration; } function notifyRewardAmount(address _rewardsToken, uint256 _reward) external nonReentrant updateReward(address(0)) { require(rewardDistributors[_rewardsToken][msg.sender]); require(_reward > 0 && _reward < 1e30, "bad reward value"); _notifyReward(_rewardsToken, _reward); // handle the transfer of reward tokens via `transferFrom` to reduce the number // of transactions required and ensure correctness of the _reward amount IERC20(_rewardsToken).safeTransferFrom(msg.sender, address(this), _reward); emit RewardAdded(_rewardsToken, _reward); } // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders function recoverERC20(address _tokenAddress, uint256 _tokenAmount) external nonReentrant onlyOwner { require(rewardData[_tokenAddress].lastUpdateTime == 0, "Cannot withdraw reward token"); require(_tokenAddress != cvxfxs, "Cannot withdraw staking token"); IERC20(_tokenAddress).safeTransfer(IBooster(IVoterProxy(vefxsProxy).operator()).rewardManager(), _tokenAmount); emit Recovered(_tokenAddress, _tokenAmount); } function _updateReward(address _account) internal{ uint256 userBal = balanceOf(_account); for (uint i = 0; i < rewardTokens.length; i++) { address token = rewardTokens[i]; rewardData[token].rewardPerTokenStored = _rewardPerToken(token); rewardData[token].lastUpdateTime = _lastTimeRewardApplicable(rewardData[token].periodFinish); if (_account != address(0)) { rewards[_account][token] = _earned(_account, token, userBal ); userRewardPerTokenPaid[_account][token] = rewardData[token].rewardPerTokenStored; } } } function _beforeTokenTransfer(address _from, address _to, uint256 ) internal override { //checkpoint from and to, can skip if address 0 so no extra gas //is used when minting burning if(_from != address(0)){ _updateReward(_from); } if(_to != address(0)){ _updateReward(_to); } } /* ========== MODIFIERS ========== */ modifier onlyOwner() { require(IBooster(IVoterProxy(vefxsProxy).operator()).rewardManager() == msg.sender, "!owner"); _; } modifier updateReward(address _account) { _updateReward(_account); _; } /* ========== EVENTS ========== */ event RewardAdded(address indexed _token, uint256 _reward); event Staked(address indexed _user, uint256 _amount); event Withdrawn(address indexed _user, uint256 _amount); event RewardPaid(address indexed _user, address indexed _rewardsToken, uint256 _reward); event Recovered(address _token, uint256 _amount); event RewardAdded(address indexed _reward, address indexed _distributor); event RewardDistributorApproved(address indexed _reward, address indexed _distributor); event RewardRedirected(address indexed _account, address _forward); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; /** * @dev Standard math utilities missing in the Solidity language. */ library MathUtil { /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IVoterProxy{ function operator() external view returns(address); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IFxsDepositor { function deposit(uint256 _amount, bool _lock) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IBooster { function addPool(address _implementation, address _stakingAddress, address _stakingToken) external; function deactivatePool(uint256 _pid) external; function voteGaugeWeight(address _controller, address _gauge, uint256 _weight) external; function setDelegate(address _delegateContract, address _delegate, bytes32 _space) external; function owner() external returns(address); function rewardManager() external returns(address); function isShutdown() external returns(bool); }
// SPDX-License-Identifier: MIT 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: MIT pragma solidity ^0.8.0; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(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) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(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) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason 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 { // 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 assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.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; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } 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)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } 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"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @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"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT 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 pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount ) external returns (bool); /** * @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); }
// SPDX-License-Identifier: MIT 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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * 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}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * 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 value {ERC20} uses, unless this function is * 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: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, 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}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), 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}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - 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) { _approve(_msgSender(), spender, _allowances[_msgSender()][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) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * 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: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, 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; _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; } _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 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: MIT 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 make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "london", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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e":"uint256","name":"_amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakeAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_for","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"stakeFor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vefxsProxy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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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.