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Multichain Info
Latest 25 from a total of 379 transactions
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Recover ERC20 | 14771026 | 836 days ago | IN | 0 ETH | 0.00404696 | ||||
Get Yield | 14515026 | 876 days ago | IN | 0 ETH | 0.00521599 | ||||
Get Yield | 14048417 | 948 days ago | IN | 0 ETH | 0.01772618 | ||||
Get Yield | 13950058 | 964 days ago | IN | 0 ETH | 0.02902835 | ||||
Checkpoint | 13796721 | 987 days ago | IN | 0 ETH | 0.00465355 | ||||
Nominate New Own... | 13366531 | 1055 days ago | IN | 0 ETH | 0.00484997 | ||||
Recover ERC20 | 12948459 | 1120 days ago | IN | 0 ETH | 0.00423729 | ||||
Get Yield | 12887283 | 1130 days ago | IN | 0 ETH | 0.0013335 | ||||
Get Yield | 12875717 | 1131 days ago | IN | 0 ETH | 0.00172191 | ||||
Get Yield | 12687298 | 1161 days ago | IN | 0 ETH | 0.00412985 | ||||
Get Yield | 12638679 | 1168 days ago | IN | 0 ETH | 0.00179152 | ||||
Get Yield | 12637832 | 1168 days ago | IN | 0 ETH | 0.00268728 | ||||
Get Yield | 12637831 | 1168 days ago | IN | 0 ETH | 0.001524 | ||||
Get Yield | 12633601 | 1169 days ago | IN | 0 ETH | 0.0051954 | ||||
Get Yield | 12633589 | 1169 days ago | IN | 0 ETH | 0.0051665 | ||||
Checkpoint | 12626497 | 1170 days ago | IN | 0 ETH | 0.0014906 | ||||
Get Yield | 12625811 | 1170 days ago | IN | 0 ETH | 0.00187973 | ||||
Get Yield | 12593656 | 1175 days ago | IN | 0 ETH | 0.00268728 | ||||
Get Yield | 12579967 | 1177 days ago | IN | 0 ETH | 0.00240313 | ||||
Get Yield | 12555436 | 1181 days ago | IN | 0 ETH | 0.00573286 | ||||
Get Yield | 12555388 | 1181 days ago | IN | 0 ETH | 0.00896343 | ||||
Get Yield | 12553934 | 1181 days ago | IN | 0 ETH | 0.00322315 | ||||
Get Yield | 12553620 | 1182 days ago | IN | 0 ETH | 0.00344455 | ||||
Get Yield | 12547867 | 1182 days ago | IN | 0 ETH | 0.00268728 | ||||
Get Yield | 12547858 | 1182 days ago | IN | 0 ETH | 0.00268728 |
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Contract Name:
veFXSYieldDistributor
Compiler Version
v0.7.6+commit.7338295f
Optimization Enabled:
Yes with 100000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; pragma experimental ABIEncoderV2; // ==================================================================== // | ______ _______ | // | / _____________ __ __ / ____(_____ ____ _____ ________ | // | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ | // | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ | // | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ | // | | // ==================================================================== // =======================veFXSYieldDistributor======================== // ==================================================================== // Distributes Frax protocol yield based on the claimer's veFXS balance // Frax Finance: https://github.com/FraxFinance // Primary Author(s) // Travis Moore: https://github.com/FortisFortuna // Reviewer(s) / Contributor(s) // Jason Huan: https://github.com/jasonhuan // Sam Kazemian: https://github.com/samkazemian // Originally inspired by Synthetixio, but heavily modified by the Frax team (veFXS portion) // https://raw.githubusercontent.com/Synthetixio/synthetix/develop/contracts/StakingYield.sol import "../Math/Math.sol"; import "../Math/SafeMath.sol"; import "../Curve/IveFXS.sol"; import "../ERC20/ERC20.sol"; import "../ERC20/SafeERC20.sol"; import "../Utils/ReentrancyGuard.sol"; import "./Owned.sol"; contract veFXSYieldDistributor is Owned, ReentrancyGuard { using SafeMath for uint256; using SafeERC20 for ERC20; /* ========== STATE VARIABLES ========== */ // Instances IveFXS private veFXS; ERC20 public emittedToken; // Addresses address emitted_token_address; // Admin addresses address public owner_address; address public timelock_address; // Constant for price precision uint256 private constant PRICE_PRECISION = 1e6; // Yield and period related uint256 public periodFinish; uint256 public lastUpdateTime; uint256 public yieldRate; uint256 public yieldDuration = 604800; // 7 * 86400 (7 days) // Yield tracking uint256 public yieldPerVeFXSStored = 0; mapping(address => uint256) public userYieldPerTokenPaid; mapping(address => uint256) public yields; // veFXS tracking uint256 public totalVeFXSParticipating = 0; uint256 public totalVeFXSSupplyStored = 0; mapping(address => uint256) public userVeFXSCheckpointed; // Greylists mapping(address => bool) public greylist; // Admin booleans for emergencies bool public yieldCollectionPaused = false; // For emergencies /* ========== MODIFIERS ========== */ modifier onlyByOwnerOrGovernance() { require(msg.sender == owner_address || msg.sender == timelock_address, "You are not the owner or the governance timelock"); _; } modifier notYieldCollectionPaused() { require(yieldCollectionPaused == false,"Yield collection is paused"); _; } modifier checkpointUser(address account) { _checkpointUser(account); _; } /* ========== CONSTRUCTOR ========== */ constructor( address _owner, address _emittedToken, address _timelock_address, address _veFXS_address ) public Owned(_owner) { owner_address = _owner; emitted_token_address = _emittedToken; emittedToken = ERC20(_emittedToken); veFXS = IveFXS(_veFXS_address); lastUpdateTime = block.timestamp; timelock_address = _timelock_address; // 1 FXS a day at initialization yieldRate = (uint256(365e18)).div(365 * 86400); } /* ========== VIEWS ========== */ function fractionParticipating() external view returns (uint256) { return totalVeFXSParticipating.mul(PRICE_PRECISION).div(totalVeFXSSupplyStored); } function lastTimeYieldApplicable() public view returns (uint256) { return Math.min(block.timestamp, periodFinish); } function yieldPerVeFXS() public view returns (uint256) { if (totalVeFXSSupplyStored == 0) { return yieldPerVeFXSStored; } else { return ( yieldPerVeFXSStored.add( lastTimeYieldApplicable() .sub(lastUpdateTime) .mul(yieldRate) .mul(1e18) .div(totalVeFXSSupplyStored) ) ); } } function earned(address account) public view returns (uint256) { uint256 yield0 = yieldPerVeFXS(); return ( userVeFXSCheckpointed[account] .mul(yield0.sub(userYieldPerTokenPaid[account])) .div(1e18) .add(yields[account]) ); } function getYieldForDuration() external view returns (uint256) { return (yieldRate.mul(yieldDuration)); } /* ========== MUTATIVE FUNCTIONS ========== */ function _checkpointUser(address account) internal { // Need to retro-adjust some things if the period hasn't been renewed, then start a new one sync(); // Get the old and the new veFXS balances uint256 old_vefxs_balance = userVeFXSCheckpointed[account]; uint256 new_vefxs_balance = veFXS.balanceOf(account); // Update the user's stored veFXS balance userVeFXSCheckpointed[account] = new_vefxs_balance; // Update the total amount participating if (new_vefxs_balance >= old_vefxs_balance) { uint256 weight_diff = new_vefxs_balance.sub(old_vefxs_balance); totalVeFXSParticipating = totalVeFXSParticipating.add(weight_diff); } else { uint256 weight_diff = old_vefxs_balance.sub(new_vefxs_balance); totalVeFXSParticipating = totalVeFXSParticipating.sub(weight_diff); } if (account != address(0)) { // Calculate the earnings uint256 earned0 = earned(account); yields[account] = earned0; userYieldPerTokenPaid[account] = yieldPerVeFXSStored; } } // Checkpoints the user function checkpoint() external { _checkpointUser(msg.sender); } function getYield() external nonReentrant notYieldCollectionPaused checkpointUser(msg.sender) { require(greylist[msg.sender] == false, "Address has been greylisted"); uint256 yield0 = yields[msg.sender]; if (yield0 > 0) { yields[msg.sender] = 0; emittedToken.transfer(msg.sender, yield0); emit YieldCollected(msg.sender, yield0, emitted_token_address); } } function renewIfApplicable() external { if (block.timestamp > periodFinish) { retroCatchUp(); } // Update the total veFXS supply totalVeFXSSupplyStored = veFXS.totalSupply(); } // If the period expired, renew it function retroCatchUp() internal { // Failsafe check require(block.timestamp > periodFinish, "Period has not expired yet!"); // Ensure the provided yield amount is not more than the balance in the contract. // This keeps the yield rate in the right range, preventing overflows due to // very high values of yieldRate in the earned and yieldPerToken functions; // Yield + leftover must be less than 2^256 / 10^18 to avoid overflow. uint256 num_periods_elapsed = uint256(block.timestamp.sub(periodFinish)) / yieldDuration; // Floor division to the nearest period uint256 balance0 = emittedToken.balanceOf(address(this)); require(yieldRate.mul(yieldDuration).mul(num_periods_elapsed + 1) <= balance0, "Not enough emittedToken available for yield distribution!"); periodFinish = periodFinish.add((num_periods_elapsed.add(1)).mul(yieldDuration)); uint256 yield0 = yieldPerVeFXS(); yieldPerVeFXSStored = yield0; lastUpdateTime = lastTimeYieldApplicable(); emit YieldPeriodRenewed(emitted_token_address); } function sync() public { // Update the total veFXS supply totalVeFXSSupplyStored = veFXS.totalSupply(); if (block.timestamp > periodFinish) { retroCatchUp(); } else { uint256 yield0 = yieldPerVeFXS(); yieldPerVeFXSStored = yield0; lastUpdateTime = lastTimeYieldApplicable(); } } /* ========== RESTRICTED FUNCTIONS ========== */ // Added to support recovering LP Yield and other mistaken tokens from other systems to be distributed to holders function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyByOwnerOrGovernance { // Only the owner address can ever receive the recovery withdrawal ERC20(tokenAddress).transfer(owner_address, tokenAmount); emit RecoveredERC20(tokenAddress, tokenAmount); } function setYieldDuration(uint256 _yieldDuration) external onlyByOwnerOrGovernance { require(periodFinish == 0 || block.timestamp > periodFinish, "Previous yield period must be complete before changing the duration for the new period"); yieldDuration = _yieldDuration; emit YieldDurationUpdated(yieldDuration); } function initializeDefault() external onlyByOwnerOrGovernance { lastUpdateTime = block.timestamp; periodFinish = block.timestamp.add(yieldDuration); totalVeFXSSupplyStored = veFXS.totalSupply(); emit DefaultInitialization(); } function greylistAddress(address _address) external onlyByOwnerOrGovernance { greylist[_address] = !(greylist[_address]); } function setPauses(bool _yieldCollectionPaused) external onlyByOwnerOrGovernance { yieldCollectionPaused = _yieldCollectionPaused; } function setYieldRate(uint256 _new_rate0, bool sync_too) external onlyByOwnerOrGovernance { yieldRate = _new_rate0; if (sync_too) { sync(); } } function setOwner(address _owner_address) external onlyByOwnerOrGovernance { owner_address = _owner_address; } function setTimelock(address _new_timelock) external onlyByOwnerOrGovernance { timelock_address = _new_timelock; } /* ========== EVENTS ========== */ event YieldCollected(address indexed user, uint256 yield, address token_address); event YieldDurationUpdated(uint256 newDuration); event RecoveredERC20(address token, uint256 amount); event YieldPeriodRenewed(address token); event DefaultInitialization(); /* ========== A CHICKEN ========== */ // // ,~. // ,-'__ `-, // {,-' `. } ,') // ,( a ) `-.__ ,',')~, // <=.) ( `-.__,==' ' ' '} // ( ) /) // `-'\ , ) // | \ `~. / // \ `._ \ / // \ `._____,' ,' // `-. ,' // `-._ _,-' // 77jj' // //_|| // __//--'/` // ,--'/` ' // // [hjw] https://textart.io/art/vw6Sa3iwqIRGkZsN1BC2vweF/chicken }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrt(uint y) internal pure returns (uint z) { if (y > 3) { z = y; uint x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } else if (y != 0) { z = 1; } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; pragma experimental ABIEncoderV2; interface IveFXS { struct LockedBalance { int128 amount; uint256 end; } /* ========== VIEWS ========== */ function balanceOf(address addr) external view returns (uint256); function balanceOf(address addr, uint256 _t) external view returns (uint256); function balanceOfAt(address addr, uint256 _block) external returns (uint256); function totalSupply() external view returns (uint256); function totalSupply(uint256 t) external view returns (uint256); function totalSupplyAt(uint256 _block) external returns (uint256); function totalFXSSupply() external view returns (uint256); function totalFXSSupplyAt(uint256 _block) external view returns (uint256); function locked(address addr) external view returns (LockedBalance memory); /* ========== PUBLIC FUNCTIONS ========== */ function checkpoint() external; }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; import "../Common/Context.sol"; import "./IERC20.sol"; import "../Math/SafeMath.sol"; import "../Utils/Address.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 {ERC20Mintable}. * * 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 guidelines: functions revert instead * of 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 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view 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 {_setupDecimals} is * called. * * 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 returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view 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.approve(address spender, uint256 amount) */ 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); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); 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].add(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) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is 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); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(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 * * - `to` 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 = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) public virtual { _burn(_msgSender(), amount); } /** * @dev Destroys `amount` tokens from `account`, deducting from the caller's * allowance. * * See {ERC20-_burn} and {ERC20-allowance}. * * Requirements: * * - the caller must have allowance for `accounts`'s tokens of at least * `amount`. */ function burnFrom(address account, uint256 amount) public virtual { uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance"); _approve(account, _msgSender(), decreasedAllowance); _burn(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); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is 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 Destroys `amount` tokens from `account`.`amount` is then deducted * from the caller's allowance. * * See {_burn} and {_approve}. */ function _burnFrom(address account, uint256 amount) internal virtual { _burn(account, amount); _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance")); } /** * @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 to 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:using-hooks.adoc[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; import "./IERC20.sol"; import "../Math/SafeMath.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 SafeMath for uint256; 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' // solhint-disable-next-line max-line-length 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _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 // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; /** * @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 () internal { _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; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; // https://docs.synthetix.io/contracts/Owned contract Owned { address public owner; address public nominatedOwner; constructor(address _owner) public { require(_owner != address(0), "Owner address cannot be 0"); owner = _owner; emit OwnerChanged(address(0), _owner); } function nominateNewOwner(address _owner) external onlyOwner { nominatedOwner = _owner; emit OwnerNominated(_owner); } function acceptOwnership() external { require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership"); emit OwnerChanged(owner, nominatedOwner); owner = nominatedOwner; nominatedOwner = address(0); } modifier onlyOwner { require(msg.sender == owner, "Only the contract owner may perform this action"); _; } event OwnerNominated(address newOwner); event OwnerChanged(address oldOwner, address newOwner); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; /* * @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 GSN 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 payable) { return payable(msg.sender); } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; import "../Common/Context.sol"; import "../Math/SafeMath.sol"; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ 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 >=0.6.11 <0.9.0; /** * @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; // solhint-disable-next-line no-inline-assembly 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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
{ "optimizer": { "enabled": true, "runs": 100000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000ff5b4bcbf765fe363269114e1c765229a29edefd0000000000000000000000003432b6a60d23ca0dfca7761b7ab56459d9c964d00000000000000000000000008412ebf45bac1b340bbe8f318b928c466c4e39ca000000000000000000000000c8418af6358ffdda74e09ca9cc3fe03ca6adc5b0
-----Decoded View---------------
Arg [0] : _owner (address): 0xfF5B4BCbf765FE363269114e1c765229a29eDeFD
Arg [1] : _emittedToken (address): 0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0
Arg [2] : _timelock_address (address): 0x8412ebf45bAC1B340BbE8F318b928C466c4E39CA
Arg [3] : _veFXS_address (address): 0xc8418aF6358FFddA74e09Ca9CC3Fe03Ca6aDC5b0
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000ff5b4bcbf765fe363269114e1c765229a29edefd
Arg [1] : 0000000000000000000000003432b6a60d23ca0dfca7761b7ab56459d9c964d0
Arg [2] : 0000000000000000000000008412ebf45bac1b340bbe8f318b928c466c4e39ca
Arg [3] : 000000000000000000000000c8418af6358ffdda74e09ca9cc3fe03ca6adc5b0
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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.