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Minimal Proxy Contract for 0x453722ca9dd2dc97ff7d95ebb2e3ce7cc69170f1
Contract Name:
StakingProxyConvex
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/ICurveConvex.sol"; import "./interfaces/IConvexWrapper.sol"; import "./StakingProxyBase.sol"; import "./interfaces/IFraxFarmERC20.sol"; import '@openzeppelin/contracts/security/ReentrancyGuard.sol'; contract StakingProxyConvex is StakingProxyBase, ReentrancyGuard{ using SafeERC20 for IERC20; address public constant poolRegistry = address(0x7413bFC877B5573E29f964d572f421554d8EDF86); address public constant convexCurveBooster = address(0xF403C135812408BFbE8713b5A23a04b3D48AAE31); address public constant crv = address(0xD533a949740bb3306d119CC777fa900bA034cd52); address public constant cvx = address(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B); address public curveLpToken; address public convexDepositToken; constructor() { } function vaultType() external pure override returns(VaultType){ return VaultType.Convex; } function vaultVersion() external pure override returns(uint256){ return 3; } //initialize vault function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external override{ require(owner == address(0),"already init"); //set variables owner = _owner; stakingAddress = _stakingAddress; stakingToken = _stakingToken; rewards = _rewardsAddress; //get tokens from pool info (address _lptoken, address _token,,, , ) = ICurveConvex(convexCurveBooster).poolInfo(IConvexWrapper(_stakingToken).convexPoolId()); curveLpToken = _lptoken; convexDepositToken = _token; //set infinite approvals IERC20(_stakingToken).approve(_stakingAddress, type(uint256).max); IERC20(_lptoken).approve(_stakingToken, type(uint256).max); IERC20(_token).approve(_stakingToken, type(uint256).max); } //create a new locked state of _secs timelength with a Curve LP token function stakeLockedCurveLp(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant returns (bytes32 kek_id){ if(_liquidity > 0){ //pull tokens from user IERC20(curveLpToken).safeTransferFrom(msg.sender, address(this), _liquidity); //deposit into wrapper IConvexWrapper(stakingToken).deposit(_liquidity, address(this)); //stake kek_id = IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs); } //checkpoint rewards _checkpointRewards(); } //create a new locked state of _secs timelength with a Convex deposit token function stakeLockedConvexToken(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant returns (bytes32 kek_id){ if(_liquidity > 0){ //pull tokens from user IERC20(convexDepositToken).safeTransferFrom(msg.sender, address(this), _liquidity); //stake into wrapper IConvexWrapper(stakingToken).stake(_liquidity, address(this)); //stake into frax kek_id = IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs); } //checkpoint rewards _checkpointRewards(); } //create a new locked state of _secs timelength function stakeLocked(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant returns (bytes32 kek_id){ if(_liquidity > 0){ //pull tokens from user IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), _liquidity); //stake kek_id = IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs); } //checkpoint rewards _checkpointRewards(); } //add to a current lock function lockAdditional(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{ if(_addl_liq > 0){ //pull tokens from user IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), _addl_liq); //add stake IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq); } //checkpoint rewards _checkpointRewards(); } //add to a current lock function lockAdditionalCurveLp(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{ if(_addl_liq > 0){ //pull tokens from user IERC20(curveLpToken).safeTransferFrom(msg.sender, address(this), _addl_liq); //deposit into wrapper IConvexWrapper(stakingToken).deposit(_addl_liq, address(this)); //add stake IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq); } //checkpoint rewards _checkpointRewards(); } //add to a current lock function lockAdditionalConvexToken(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{ if(_addl_liq > 0){ //pull tokens from user IERC20(convexDepositToken).safeTransferFrom(msg.sender, address(this), _addl_liq); //stake into wrapper IConvexWrapper(stakingToken).stake(_addl_liq, address(this)); //add stake IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq); } //checkpoint rewards _checkpointRewards(); } // Extends the lock of an existing stake function lockLonger(bytes32 _kek_id, uint256 new_ending_ts) external onlyOwner nonReentrant{ //update time IFraxFarmERC20(stakingAddress).lockLonger(_kek_id, new_ending_ts); //checkpoint rewards _checkpointRewards(); } //withdraw a staked position //frax farm transfers first before updating farm state so will checkpoint during transfer function withdrawLocked(bytes32 _kek_id) external onlyOwner nonReentrant{ //withdraw directly to owner(msg.sender) IFraxFarmERC20(stakingAddress).withdrawLocked(_kek_id, msg.sender); //checkpoint rewards _checkpointRewards(); } //withdraw a staked position //frax farm transfers first before updating farm state so will checkpoint during transfer function withdrawLockedAndUnwrap(bytes32 _kek_id) external onlyOwner nonReentrant{ //withdraw IFraxFarmERC20(stakingAddress).withdrawLocked(_kek_id, address(this)); //unwrap IConvexWrapper(stakingToken).withdrawAndUnwrap(IERC20(stakingToken).balanceOf(address(this))); IERC20(curveLpToken).transfer(owner,IERC20(curveLpToken).balanceOf(address(this))); //checkpoint rewards _checkpointRewards(); } //helper function to combine earned tokens on staking contract and any tokens that are on this vault function earned() external view override returns (address[] memory token_addresses, uint256[] memory total_earned) { //get list of reward tokens address[] memory rewardTokens = IFraxFarmERC20(stakingAddress).getAllRewardTokens(); uint256[] memory stakedearned = IFraxFarmERC20(stakingAddress).earned(address(this)); IConvexWrapper.EarnedData[] memory convexrewards = IConvexWrapper(stakingToken).earned(address(this)); uint256 extraRewardsLength = IRewards(rewards).rewardTokenLength(); token_addresses = new address[](rewardTokens.length + extraRewardsLength + convexrewards.length); total_earned = new uint256[](rewardTokens.length + extraRewardsLength + convexrewards.length); //add any tokens that happen to be already claimed but sitting on the vault //(ex. withdraw claiming rewards) for(uint256 i = 0; i < rewardTokens.length; i++){ token_addresses[i] = rewardTokens[i]; total_earned[i] = stakedearned[i] + IERC20(rewardTokens[i]).balanceOf(address(this)); } IRewards.EarnedData[] memory extraRewards = IRewards(rewards).claimableRewards(address(this)); for(uint256 i = 0; i < extraRewards.length; i++){ token_addresses[i+rewardTokens.length] = extraRewards[i].token; total_earned[i+rewardTokens.length] = extraRewards[i].amount; } //add convex farm earned tokens for(uint256 i = 0; i < convexrewards.length; i++){ token_addresses[i+rewardTokens.length+extraRewardsLength] = convexrewards[i].token; total_earned[i+rewardTokens.length+extraRewardsLength] = convexrewards[i].amount; } } /* claim flow: claim rewards directly to the vault calculate fees to send to fee deposit send fxs to a holder contract for fees get reward list of tokens that were received send all remaining tokens to owner A slightly less gas intensive approach could be to send rewards directly to a holder contract and have it sort everything out. However that makes the logic a bit more complex as well as runs a few future proofing risks */ function getReward() external override{ getReward(true); } //get reward with claim option. //_claim bool is for the off chance that rewardCollectionPause is true so getReward() fails but //there are tokens on this vault for cases such as withdraw() also calling claim. //can also be used to rescue tokens on the vault function getReward(bool _claim) public override{ //claim if(_claim){ //claim frax farm IFraxFarmERC20(stakingAddress).getReward(address(this)); //claim convex farm and forward to owner IConvexWrapper(stakingToken).getReward(address(this),owner); //double check there have been no crv/cvx claims directly to this address uint256 b = IERC20(crv).balanceOf(address(this)); if(b > 0){ IERC20(crv).safeTransfer(owner, b); } b = IERC20(cvx).balanceOf(address(this)); if(b > 0){ IERC20(cvx).safeTransfer(owner, b); } } //process fxs fees _processFxs(); //get list of reward tokens address[] memory rewardTokens = IFraxFarmERC20(stakingAddress).getAllRewardTokens(); //transfer _transferTokens(rewardTokens); //extra rewards _processExtraRewards(); } //auxiliary function to supply token list(save a bit of gas + dont have to claim everything) //_claim bool is for the off chance that rewardCollectionPause is true so getReward() fails but //there are tokens on this vault for cases such as withdraw() also calling claim. //can also be used to rescue tokens on the vault function getReward(bool _claim, address[] calldata _rewardTokenList) external override{ //claim if(_claim){ //claim frax farm IFraxFarmERC20(stakingAddress).getReward(address(this)); //claim convex farm and forward to owner IConvexWrapper(stakingToken).getReward(address(this),owner); } //process fxs fees _processFxs(); //transfer _transferTokens(_rewardTokenList); //extra rewards _processExtraRewards(); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IRewards{ struct EarnedData { address token; uint256 amount; } function initialize(uint256 _pid, bool _startActive) external; function addReward(address _rewardsToken, address _distributor) external; function approveRewardDistributor( address _rewardsToken, address _distributor, bool _approved ) external; function deposit(address _owner, uint256 _amount) external; function withdraw(address _owner, uint256 _amount) external; function getReward(address _forward) external; function notifyRewardAmount(address _rewardsToken, uint256 _reward) external; function balanceOf(address account) external view returns (uint256); function claimableRewards(address _account) external view returns(EarnedData[] memory userRewards); function rewardTokens(uint256 _rid) external view returns (address); function rewardTokenLength() external view returns(uint256); function active() external view returns(bool); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IProxyVault { enum VaultType{ Erc20Basic, UniV3, Convex, Erc20Joint } function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external; function usingProxy() external returns(address); function owner() external returns(address); function stakingAddress() external returns(address); function rewards() external returns(address); function getReward() external; function getReward(bool _claim) external; function getReward(bool _claim, address[] calldata _rewardTokenList) external; function earned() external view returns (address[] memory token_addresses, uint256[] memory total_earned); }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; interface IFraxFarmERC20 { struct LockedStake { bytes32 kek_id; uint256 start_timestamp; uint256 liquidity; uint256 ending_timestamp; uint256 lock_multiplier; // 6 decimals of precision. 1x = 1000000 } function owner() external view returns (address); function stakingToken() external view returns (address); function fraxPerLPToken() external view returns (uint256); function calcCurCombinedWeight(address account) external view returns ( uint256 old_combined_weight, uint256 new_vefxs_multiplier, uint256 new_combined_weight ); function lockedStakesOf(address account) external view returns (LockedStake[] memory); function lockedStakesOfLength(address account) external view returns (uint256); function lockAdditional(bytes32 kek_id, uint256 addl_liq) external; function lockLonger(bytes32 kek_id, uint256 new_ending_ts) external; function stakeLocked(uint256 liquidity, uint256 secs) external returns (bytes32); function withdrawLocked(bytes32 kek_id, address destination_address) external returns (uint256); function periodFinish() external view returns (uint256); function getAllRewardTokens() external view returns (address[] memory); function earned(address account) external view returns (uint256[] memory new_earned); function totalLiquidityLocked() external view returns (uint256); function lockedLiquidityOf(address account) external view returns (uint256); function totalCombinedWeight() external view returns (uint256); function combinedWeightOf(address account) external view returns (uint256); function lockMultiplier(uint256 secs) external view returns (uint256); function rewardRates(uint256 token_idx) external view returns (uint256 rwd_rate); function userStakedFrax(address account) external view returns (uint256); function proxyStakedFrax(address proxy_address) external view returns (uint256); function maxLPForMaxBoost(address account) external view returns (uint256); function minVeFXSForMaxBoost(address account) external view returns (uint256); function minVeFXSForMaxBoostProxy(address proxy_address) external view returns (uint256); function veFXSMultiplier(address account) external view returns (uint256 vefxs_multiplier); function toggleValidVeFXSProxy(address proxy_address) external; function proxyToggleStaker(address staker_address) external; function stakerSetVeFXSProxy(address proxy_address) external; function getReward(address destination_address) external returns (uint256[] memory); function vefxs_max_multiplier() external view returns(uint256); function vefxs_boost_scale_factor() external view returns(uint256); function vefxs_per_frax_for_max_boost() external view returns(uint256); function getProxyFor(address addr) external view returns (address); function sync() external; }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; interface IFraxFarmBase{ function totalLiquidityLocked() external view returns (uint256); function lockedLiquidityOf(address account) external view returns (uint256); function toggleValidVeFXSProxy(address proxy_address) external; function proxyToggleStaker(address staker_address) external; function stakerSetVeFXSProxy(address proxy_address) external; function getReward(address destination_address) external returns (uint256[] memory); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IFeeRegistry{ function cvxfxsIncentive() external view returns(uint256); function cvxIncentive() external view returns(uint256); function platformIncentive() external view returns(uint256); function totalFees() external view returns(uint256); function maxFees() external view returns(uint256); function feeDeposit() external view returns(address); function getFeeDepositor(address _from) external view returns(address); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface ICurveConvex { function earmarkRewards(uint256 _pid) external returns(bool); function earmarkFees() external returns(bool); function poolInfo(uint256 _pid) external returns(address _lptoken, address _token, address _gauge, address _crvRewards, address _stash, bool _shutdown); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; interface IConvexWrapper{ struct EarnedData { address token; uint256 amount; } function convexPoolId() external view returns(uint256 _poolId); function balanceOf(address _account) external view returns(uint256); function totalBalanceOf(address _account) external view returns(uint256); function deposit(uint256 _amount, address _to) external; function stake(uint256 _amount, address _to) external; function withdraw(uint256 _amount) external; function withdrawAndUnwrap(uint256 _amount) external; function getReward(address _account) external; function getReward(address _account, address _forwardTo) external; function rewardLength() external view returns(uint256); function earned(address _account) external view returns(EarnedData[] memory claimable); function setVault(address _vault) external; function user_checkpoint(address[2] calldata _accounts) external returns(bool); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.10; import "./interfaces/IProxyVault.sol"; import "./interfaces/IFeeRegistry.sol"; import "./interfaces/IFraxFarmBase.sol"; import "./interfaces/IRewards.sol"; import '@openzeppelin/contracts/token/ERC20/IERC20.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; contract StakingProxyBase is IProxyVault{ using SafeERC20 for IERC20; address public constant fxs = address(0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0); address public constant vefxsProxy = address(0x59CFCD384746ec3035299D90782Be065e466800B); address public constant feeRegistry = address(0xC9aCB83ADa68413a6Aa57007BC720EE2E2b3C46D); //fee registry address public owner; //owner of the vault address public stakingAddress; //farming contract address public stakingToken; //farming token address public rewards; //extra rewards on convex address public usingProxy; //address of proxy being used uint256 public constant FEE_DENOMINATOR = 10000; constructor() { } function vaultType() external virtual pure returns(VaultType){ return VaultType.Erc20Basic; } function vaultVersion() external virtual pure returns(uint256){ return 1; } modifier onlyOwner() { require(owner == msg.sender, "!auth"); _; } modifier onlyAdmin() { require(vefxsProxy == msg.sender, "!auth_admin"); _; } //initialize vault function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external virtual{ } function changeRewards(address _rewardsAddress) external onlyAdmin{ //remove from old rewards and claim if(IRewards(rewards).active()){ uint256 bal = IRewards(rewards).balanceOf(address(this)); if(bal > 0){ IRewards(rewards).withdraw(owner, bal); } IRewards(rewards).getReward(owner); } //set to new rewards rewards = _rewardsAddress; //update balance _checkpointRewards(); } //checkpoint weight on farm by calling getReward as its the lowest cost thing to do. function checkpointRewards() external onlyAdmin{ //checkpoint the frax farm _checkpointFarm(); } function _checkpointFarm() internal{ //claim rewards to local vault as a means to checkpoint IFraxFarmBase(stakingAddress).getReward(address(this)); } function setVeFXSProxy(address _proxy) external virtual onlyAdmin{ //set the vefxs proxy _setVeFXSProxy(_proxy); } function _setVeFXSProxy(address _proxyAddress) internal{ //set proxy address on staking contract IFraxFarmBase(stakingAddress).stakerSetVeFXSProxy(_proxyAddress); usingProxy = _proxyAddress; } function getReward() external virtual{} function getReward(bool _claim) external virtual{} function getReward(bool _claim, address[] calldata _rewardTokenList) external virtual{} function earned() external view virtual returns (address[] memory token_addresses, uint256[] memory total_earned){} //checkpoint and add/remove weight to convex rewards contract function _checkpointRewards() internal{ //if rewards are active, checkpoint if(IRewards(rewards).active()){ //using liquidity shares from staking contract will handle rebasing tokens correctly uint256 userLiq = IFraxFarmBase(stakingAddress).lockedLiquidityOf(address(this)); //get current balance of reward contract uint256 bal = IRewards(rewards).balanceOf(address(this)); if(userLiq >= bal){ //add the difference to reward contract IRewards(rewards).deposit(owner, userLiq - bal); }else{ //remove the difference from the reward contract IRewards(rewards).withdraw(owner, bal - userLiq); } } } //apply fees to fxs and send remaining to owner function _processFxs() internal{ //get fee rate from fee registry uint256 totalFees = IFeeRegistry(feeRegistry).totalFees(); //send fxs fees to fee deposit uint256 fxsBalance = IERC20(fxs).balanceOf(address(this)); uint256 sendAmount = fxsBalance * totalFees / FEE_DENOMINATOR; if(sendAmount > 0){ IERC20(fxs).transfer(IFeeRegistry(feeRegistry).getFeeDepositor(usingProxy), sendAmount); } //transfer remaining fxs to owner sendAmount = IERC20(fxs).balanceOf(address(this)); if(sendAmount > 0){ IERC20(fxs).transfer(owner, sendAmount); } } //get extra rewards function _processExtraRewards() internal{ if(IRewards(rewards).active()){ //check if there is a balance because the reward contract could have be activated later //dont use _checkpointRewards since difference of 0 will still call deposit() and cost gas uint256 bal = IRewards(rewards).balanceOf(address(this)); uint256 userLiq = IFraxFarmBase(stakingAddress).lockedLiquidityOf(address(this)); if(bal == 0 && userLiq > 0){ //bal == 0 and liq > 0 can only happen if rewards were turned on after staking IRewards(rewards).deposit(owner,userLiq); } IRewards(rewards).getReward(owner); } } //transfer other reward tokens besides fxs(which needs to have fees applied) function _transferTokens(address[] memory _tokens) internal{ //transfer all tokens for(uint256 i = 0; i < _tokens.length; i++){ if(_tokens[i] != fxs){ uint256 bal = IERC20(_tokens[i]).balanceOf(address(this)); if(bal > 0){ IERC20(_tokens[i]).safeTransfer(owner, bal); } } } } }
// 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; /** * @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; /** * @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" ] } } }
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $1.87 | 0.0912 | $0.1706 |
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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.