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Overview
POL Balance
POL Value
$0.00Token Holdings
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- ERC-20 Tokens (23)9,650 Access Airdrop Link [zksyon.one]ERC-20: ! Airdrop... (Access...)5,400 5400$ claim mantra-ethen.topERC-20: MANTRA (5400$ ...)7,864 TokenERC-20 TOKEN*[Suspicious]724,900 TokenERC-20 TOKEN*[Suspicious]7,800 TokenERC-20 TOKEN*[Suspicious]9,543 TokenERC-20 TOKEN*[Suspicious]7,800 TokenERC-20 TOKEN*[Suspicious]1 TokenERC-20 TOKEN*[Suspicious]1 TokenERC-20 TOKEN*[Suspicious]550,000 TokenERC-20 TOKEN*[Spam]987,921 TokenERC-20 TOKEN*[Spam]22,400 TokenERC-20 TOKEN*[Spam]4,376 TokenERC-20 TOKEN*[Spam]85,600 TokenERC-20 TOKEN*[Spam]175,900 TokenERC-20 TOKEN*[Spam]10,000 TokenERC-20 TOKEN*[Spam]14,888 TokenERC-20 TOKEN*[Spam]15,500 TokenERC-20 TOKEN*[Spam]1 TokenERC-20 TOKEN*[Spam]1 TokenERC-20 TOKEN*[Spam]1 TokenERC-20 TOKEN*[Spam]1 TokenERC-20 TOKEN*[Spam]1 TokenERC-20 TOKEN*[Spam]NFT Tokens (15)drops-usdc.com$1000 drops-usdc.comERC-1155drop-usdt.xyz2000$ RewardERC-1155WSTWst memesx2ERC-721ERC-1155 TOKEN*[Suspicious]ERC-1155 TOKEN*[Suspicious]ERC-1155 TOKEN*x2 [Suspicious]
Latest 25 from a total of 52 transactions
Transaction Hash MethodBlockFromToCancel 65198721 2024-12-07 16:08:58 5 days ago 1733587738 IN 0 POL$0.00 0.00139305 30.00020475 Cancel 65198672 2024-12-07 16:07:14 5 days ago 1733587634 IN 0 POL$0.00 0.00139306 30.000294 Cancel 65194663 2024-12-07 13:40:02 5 days ago 1733578802 IN 0 POL$0.00 0.00668663 143.99999648 Cancel 59993965 2024-07-30 15:58:28 135 days ago 1722355108 IN 0 POL$0.00 0.00139305 30.00000016 Swap Any Sender 57708103 2024-06-03 5:14:18 193 days ago 1717391658 IN 0 POL$0.00 0.00453009 30.00000005 Cancel 56154567 2024-04-23 7:36:24 234 days ago 1713857784 IN 0 POL$0.00 0.01118146 240.79820374 Swap Any Sender 55737860 2024-04-12 12:45:51 244 days ago 1712925951 IN 0 POL$0.00 0.04881006 287.60865853 Swap Any Sender 54776166 2024-03-17 19:17:43 270 days ago 1710703063 IN 0 POL$0.00 0.00522215 30.77325031 Cancel 53407667 2024-02-11 22:05:43 305 days ago 1707689143 IN 0 POL$0.00 0.00140653 30.29032601 Cancel 53367588 2024-02-10 22:09:40 306 days ago 1707602980 IN 0 POL$0.00 0.00139305 30.00000012 Swap 53155315 2024-02-05 14:15:57 311 days ago 1707142557 IN 0 POL$0.00 0.01991121 142.01805979 Swap 52966791 2024-01-31 15:58:46 316 days ago 1706716726 IN 0 POL$0.00 0.01730061 119.29320786 Swap 52965191 2024-01-31 14:56:46 316 days ago 1706713006 IN 0 POL$0.00 0.02386884 143.01116765 Swap 52962788 2024-01-31 13:23:37 316 days ago 1706707417 IN 0 POL$0.00 0.01844866 96.36080131 Swap 52926911 2024-01-30 14:25:16 317 days ago 1706624716 IN 0 POL$0.00 0.02940813 176.87510502 Cancel 52615664 2024-01-22 9:55:11 325 days ago 1705917311 IN 0 POL$0.00 0.00195027 42 Swap Any Sender 52129375 2024-01-09 17:13:22 338 days ago 1704820402 IN 0 POL$0.00 0.00776245 45.73950143 Cancel 52021653 2024-01-06 21:57:56 341 days ago 1704578276 IN 0 POL$0.00 0.00146084 31.4600228 Cancel 52021487 2024-01-06 21:52:00 341 days ago 1704577920 IN 0 POL$0.00 0.00169519 36.50682127 Cancel 52021441 2024-01-06 21:50:24 341 days ago 1704577824 IN 0 POL$0.00 0.00143943 30.99890482 Cancel 51999743 2024-01-06 8:17:47 342 days ago 1704529067 IN 0 POL$0.00 0.00236986 51.03614284 Cancel 51999704 2024-01-06 8:16:25 342 days ago 1704528985 IN 0 POL$0.00 0.00227938 49.08761038 Cancel 51999467 2024-01-06 8:08:01 342 days ago 1704528481 IN 0 POL$0.00 0.00241169 51.93698301 Cancel 51832877 2024-01-02 0:04:25 346 days ago 1704153865 IN 0 POL$0.00 0.00139445 30.03023448 Swap 51558784 2023-12-26 0:57:39 353 days ago 1703552259 IN 0 POL$0.00 0.00470025 35.28854948 Loading...LoadingContract Name:SwapERC20
Compiler Versionv0.8.17+commit.8df45f5f
Optimization Enabled:Yes with 999999 runs
Other Settings:default evmVersionContract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "@openzeppelin/contracts/access/Ownable2Step.sol"; import "@openzeppelin/contracts/utils/cryptography/EIP712.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "./interfaces/ISwapERC20.sol"; /** * @title AirSwap: Atomic ERC20 Token Swap * @notice https://www.airswap.io/ */ contract SwapERC20 is ISwapERC20, Ownable2Step, EIP712 { using SafeERC20 for IERC20; bytes32 public constant ORDER_TYPEHASH = keccak256( abi.encodePacked( "OrderERC20(uint256 nonce,uint256 expiry,address signerWallet,address signerToken,uint256 signerAmount,", "uint256 protocolFee,address senderWallet,address senderToken,uint256 senderAmount)" ) ); // Domain name and version for use in EIP712 signatures string public constant DOMAIN_NAME = "SWAP_ERC20"; string public constant DOMAIN_VERSION = "4"; uint256 public immutable DOMAIN_CHAIN_ID; bytes32 public immutable DOMAIN_SEPARATOR; uint256 public constant FEE_DIVISOR = 10000; uint256 internal constant MAX_PERCENTAGE = 100; uint256 internal constant MAX_SCALE = 77; uint256 internal constant MAX_ERROR_COUNT = 9; /** * @notice Double mapping of signers to nonce groups to nonce states * @dev The nonce group is computed as nonce / 256, so each group of 256 sequential nonces uses the same key * @dev The nonce states are encoded as 256 bits, for each nonce in the group 0 means available and 1 means used */ mapping(address => mapping(uint256 => uint256)) internal _nonceGroups; // Mapping of signer to authorized signatory mapping(address => address) public override authorized; uint256 public protocolFee; uint256 public protocolFeeLight; address public protocolFeeWallet; uint256 public rebateScale; uint256 public rebateMax; address public staking; /** * @notice Constructor * @dev Sets domain and version for EIP712 signatures * @param _protocolFee uin256 fee to be assessed on swaps * @param _protocolFeeWallet address destination for fees * @param _rebateScale uin256 scale factor for rebate * @param _rebateMax uint256 max rebate percentage * @param _staking address staking contract address */ constructor( uint256 _protocolFee, uint256 _protocolFeeLight, address _protocolFeeWallet, uint256 _rebateScale, uint256 _rebateMax, address _staking ) EIP712(DOMAIN_NAME, DOMAIN_VERSION) { if (_protocolFee >= FEE_DIVISOR) revert InvalidFee(); if (_protocolFeeLight >= FEE_DIVISOR) revert InvalidFeeLight(); if (_protocolFeeWallet == address(0)) revert InvalidFeeWallet(); if (_rebateScale > MAX_SCALE) revert ScaleTooHigh(); if (_rebateMax > MAX_PERCENTAGE) revert MaxTooHigh(); if (_staking == address(0)) revert InvalidStaking(); DOMAIN_CHAIN_ID = block.chainid; DOMAIN_SEPARATOR = _domainSeparatorV4(); protocolFee = _protocolFee; protocolFeeLight = _protocolFeeLight; protocolFeeWallet = _protocolFeeWallet; rebateScale = _rebateScale; rebateMax = _rebateMax; staking = _staking; } /** * @notice Atomic ERC20 Swap * @param recipient address Wallet to receive sender proceeds * @param nonce uint256 Unique and should be sequential * @param expiry uint256 Expiry in seconds since 1 January 1970 * @param signerWallet address Wallet of the signer * @param signerToken address ERC20 token transferred from the signer * @param signerAmount uint256 Amount transferred from the signer * @param senderToken address ERC20 token transferred from the sender * @param senderAmount uint256 Amount transferred from the sender * @param v uint8 "v" value of the ECDSA signature * @param r bytes32 "r" value of the ECDSA signature * @param s bytes32 "s" value of the ECDSA signature */ function swap( address recipient, uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external override { // Ensure the order is valid for signer and sender _check( nonce, expiry, signerWallet, signerToken, signerAmount, msg.sender, senderToken, senderAmount, v, r, s ); // Transfer token from sender to signer IERC20(senderToken).safeTransferFrom( msg.sender, signerWallet, senderAmount ); // Transfer token from signer to recipient IERC20(signerToken).safeTransferFrom(signerWallet, recipient, signerAmount); // Calculate and transfer protocol fee and any rebate _transferProtocolFee(signerToken, signerWallet, signerAmount); // Emit a Swap event emit SwapERC20( nonce, signerWallet, signerToken, signerAmount, protocolFee, msg.sender, senderToken, senderAmount ); } /** * @notice Atomic ERC20 Swap for Any Sender * @param recipient address Wallet to receive sender proceeds * @param nonce uint256 Unique and should be sequential * @param expiry uint256 Expiry in seconds since 1 January 1970 * @param signerWallet address Wallet of the signer * @param signerToken address ERC20 token transferred from the signer * @param signerAmount uint256 Amount transferred from the signer * @param senderToken address ERC20 token transferred from the sender * @param senderAmount uint256 Amount transferred from the sender * @param v uint8 "v" value of the ECDSA signature * @param r bytes32 "r" value of the ECDSA signature * @param s bytes32 "s" value of the ECDSA signature */ function swapAnySender( address recipient, uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external override { // Ensure the order is valid _check( nonce, expiry, signerWallet, signerToken, signerAmount, address(0), senderToken, senderAmount, v, r, s ); // Transfer token from sender to signer IERC20(senderToken).safeTransferFrom( msg.sender, signerWallet, senderAmount ); // Transfer token from signer to recipient IERC20(signerToken).safeTransferFrom(signerWallet, recipient, signerAmount); // Calculate and transfer protocol fee and any rebate _transferProtocolFee(signerToken, signerWallet, signerAmount); // Emit a Swap event emit SwapERC20( nonce, signerWallet, signerToken, signerAmount, protocolFee, msg.sender, senderToken, senderAmount ); } /** * @notice Swap Atomic ERC20 Swap (Low Gas Usage) * @param nonce uint256 Unique and should be sequential * @param expiry uint256 Expiry in seconds since 1 January 1970 * @param signerWallet address Wallet of the signer * @param signerToken address ERC20 token transferred from the signer * @param signerAmount uint256 Amount transferred from the signer * @param senderToken address ERC20 token transferred from the sender * @param senderAmount uint256 Amount transferred from the sender * @param v uint8 "v" value of the ECDSA signature * @param r bytes32 "r" value of the ECDSA signature * @param s bytes32 "s" value of the ECDSA signature */ function swapLight( uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external override { if (DOMAIN_CHAIN_ID != block.chainid) revert ChainIdChanged(); // Ensure the expiry is not passed if (expiry <= block.timestamp) revert OrderExpired(); // Recover the signatory from the hash and signature (address signatory, ) = ECDSA.tryRecover( keccak256( abi.encodePacked( "\x19\x01", // EIP191: Indicates EIP712 DOMAIN_SEPARATOR, keccak256( abi.encode( ORDER_TYPEHASH, nonce, expiry, signerWallet, signerToken, signerAmount, protocolFeeLight, msg.sender, senderToken, senderAmount ) ) ) ), v, r, s ); // Ensure the signatory is not null if (signatory == address(0)) revert SignatureInvalid(); // Ensure the nonce is not yet used and if not mark it used if (!_markNonceAsUsed(signatory, nonce)) revert NonceAlreadyUsed(nonce); // Ensure signatory is authorized to sign if (authorized[signerWallet] != address(0)) { // If one is set by signer wallet, signatory must be authorized if (signatory != authorized[signerWallet]) revert SignatoryUnauthorized(); } else { // Otherwise, signatory must be signer wallet if (signatory != signerWallet) revert Unauthorized(); } // Transfer token from sender to signer IERC20(senderToken).safeTransferFrom( msg.sender, signerWallet, senderAmount ); // Transfer token from signer to recipient IERC20(signerToken).safeTransferFrom( signerWallet, msg.sender, signerAmount ); // Transfer fee from signer to feeWallet IERC20(signerToken).safeTransferFrom( signerWallet, protocolFeeWallet, (signerAmount * protocolFeeLight) / FEE_DIVISOR ); // Emit a Swap event emit SwapERC20( nonce, signerWallet, signerToken, signerAmount, protocolFeeLight, msg.sender, senderToken, senderAmount ); } /** * @notice Set the fee * @param _protocolFee uint256 Value of the fee in basis points */ function setProtocolFee(uint256 _protocolFee) external onlyOwner { // Ensure the fee is less than divisor if (_protocolFee >= FEE_DIVISOR) revert InvalidFee(); protocolFee = _protocolFee; emit SetProtocolFee(_protocolFee); } /** * @notice Set the light fee * @param _protocolFeeLight uint256 Value of the fee in basis points */ function setProtocolFeeLight(uint256 _protocolFeeLight) external onlyOwner { // Ensure the fee is less than divisor if (_protocolFeeLight >= FEE_DIVISOR) revert InvalidFeeLight(); protocolFeeLight = _protocolFeeLight; emit SetProtocolFeeLight(_protocolFeeLight); } /** * @notice Set the fee wallet * @param _protocolFeeWallet address Wallet to transfer fee to */ function setProtocolFeeWallet(address _protocolFeeWallet) external onlyOwner { // Ensure the new fee wallet is not null if (_protocolFeeWallet == address(0)) revert InvalidFeeWallet(); protocolFeeWallet = _protocolFeeWallet; emit SetProtocolFeeWallet(_protocolFeeWallet); } /** * @notice Set scale * @dev Only owner * @param _rebateScale uint256 */ function setRebateScale(uint256 _rebateScale) external onlyOwner { if (_rebateScale > MAX_SCALE) revert ScaleTooHigh(); rebateScale = _rebateScale; emit SetRebateScale(_rebateScale); } /** * @notice Set max * @dev Only owner * @param _rebateMax uint256 */ function setRebateMax(uint256 _rebateMax) external onlyOwner { if (_rebateMax > MAX_PERCENTAGE) revert MaxTooHigh(); rebateMax = _rebateMax; emit SetRebateMax(_rebateMax); } /** * @notice Set the staking token * @param newstaking address Token to check balances on */ function setStaking(address newstaking) external onlyOwner { // Ensure the new staking token is not null if (newstaking == address(0)) revert InvalidStaking(); staking = newstaking; emit SetStaking(newstaking); } /** * @notice Authorize a signatory * @param signatory address Wallet of the signatory to authorize * @dev Emits an Authorize event */ function authorize(address signatory) external override { if (signatory == address(0)) revert SignatoryInvalid(); authorized[msg.sender] = signatory; emit Authorize(signatory, msg.sender); } /** * @notice Revoke the signatory * @dev Emits a Revoke event */ function revoke() external override { address tmp = authorized[msg.sender]; delete authorized[msg.sender]; emit Revoke(tmp, msg.sender); } /** * @notice Cancel one or more nonces * @dev Cancelled nonces are marked as used * @dev Emits a Cancel event * @dev Out of gas may occur in arrays of length > 400 * @param nonces uint256[] List of nonces to cancel */ function cancel(uint256[] calldata nonces) external override { for (uint256 i = 0; i < nonces.length; i++) { uint256 nonce = nonces[i]; if (_markNonceAsUsed(msg.sender, nonce)) { emit Cancel(nonce, msg.sender); } } } /** * @notice Checks order and returns list of errors * @param senderWallet address Wallet that would send the order * @param nonce uint256 Unique and should be sequential * @param expiry uint256 Expiry in seconds since 1 January 1970 * @param signerWallet address Wallet of the signer * @param signerToken address ERC20 token transferred from the signer * @param signerAmount uint256 Amount transferred from the signer * @param senderToken address ERC20 token transferred from the sender * @param senderAmount uint256 Amount transferred from the sender * @param v uint8 "v" value of the ECDSA signature * @param r bytes32 "r" value of the ECDSA signature * @param s bytes32 "s" value of the ECDSA signature * @return tuple of error count and bytes32[] memory array of error messages */ function check( address senderWallet, uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) public view returns (uint256, bytes32[] memory) { bytes32[] memory errors = new bytes32[](MAX_ERROR_COUNT); OrderERC20 memory order; uint256 errCount; order.nonce = nonce; order.expiry = expiry; order.signerWallet = signerWallet; order.signerToken = signerToken; order.signerAmount = signerAmount; order.senderToken = senderToken; order.senderAmount = senderAmount; order.v = v; order.r = r; order.s = s; order.senderWallet = senderWallet; address signatory = ecrecover( _getOrderHash( order.nonce, order.expiry, order.signerWallet, order.signerToken, order.signerAmount, order.senderWallet, order.senderToken, order.senderAmount ), order.v, order.r, order.s ); if (signatory == address(0)) { errors[errCount] = "SignatureInvalid"; errCount++; } else { if ( authorized[order.signerWallet] != address(0) && signatory != authorized[order.signerWallet] ) { errors[errCount] = "SignatoryUnauthorized"; errCount++; } else if ( authorized[order.signerWallet] == address(0) && signatory != order.signerWallet ) { errors[errCount] = "Unauthorized"; errCount++; } else if (nonceUsed(signatory, order.nonce)) { errors[errCount] = "NonceAlreadyUsed"; errCount++; } } if (order.expiry < block.timestamp) { errors[errCount] = "OrderExpired"; errCount++; } if (order.senderWallet != address(0)) { uint256 senderBalance = IERC20(order.senderToken).balanceOf( order.senderWallet ); uint256 senderAllowance = IERC20(order.senderToken).allowance( order.senderWallet, address(this) ); if (senderAllowance < order.senderAmount) { errors[errCount] = "SenderAllowanceLow"; errCount++; } if (senderBalance < order.senderAmount) { errors[errCount] = "SenderBalanceLow"; errCount++; } } uint256 signerBalance = IERC20(order.signerToken).balanceOf( order.signerWallet ); uint256 signerAllowance = IERC20(order.signerToken).allowance( order.signerWallet, address(this) ); uint256 signerFeeAmount = (order.signerAmount * protocolFee) / FEE_DIVISOR; if (signerAllowance < order.signerAmount + signerFeeAmount) { errors[errCount] = "SignerAllowanceLow"; errCount++; } if (signerBalance < order.signerAmount + signerFeeAmount) { errors[errCount] = "SignerBalanceLow"; errCount++; } return (errCount, errors); } /** * @notice Calculate output amount for an input score * @param stakingBalance uint256 * @param feeAmount uint256 */ function calculateDiscount( uint256 stakingBalance, uint256 feeAmount ) public view returns (uint256) { uint256 divisor = (uint256(10) ** rebateScale) + stakingBalance; return (rebateMax * stakingBalance * feeAmount) / divisor / 100; } /** * @notice Calculates and refers fee amount * @param wallet address * @param amount uint256 */ function calculateProtocolFee( address wallet, uint256 amount ) public view override returns (uint256) { // Transfer fee from signer to feeWallet uint256 feeAmount = (amount * protocolFee) / FEE_DIVISOR; if (feeAmount > 0) { uint256 discountAmount = calculateDiscount( IERC20(staking).balanceOf(wallet), feeAmount ); return feeAmount - discountAmount; } return feeAmount; } /** * @notice Returns true if the nonce has been used * @param signer address Address of the signer * @param nonce uint256 Nonce being checked */ function nonceUsed( address signer, uint256 nonce ) public view override returns (bool) { uint256 groupKey = nonce / 256; uint256 indexInGroup = nonce % 256; return (_nonceGroups[signer][groupKey] >> indexInGroup) & 1 == 1; } /** * @notice Marks a nonce as used for the given signer * @param signer address Address of the signer for which to mark the nonce as used * @param nonce uint256 Nonce to be marked as used * @return bool True if the nonce was not marked as used already */ function _markNonceAsUsed( address signer, uint256 nonce ) internal returns (bool) { uint256 groupKey = nonce / 256; uint256 indexInGroup = nonce % 256; uint256 group = _nonceGroups[signer][groupKey]; // If it is already used, return false if ((group >> indexInGroup) & 1 == 1) { return false; } _nonceGroups[signer][groupKey] = group | (uint256(1) << indexInGroup); return true; } /** * @notice Checks order and reverts on error * @param nonce uint256 Unique and should be sequential * @param expiry uint256 Expiry in seconds since 1 January 1970 * @param signerWallet address Wallet of the signer * @param signerToken address ERC20 token transferred from the signer * @param signerAmount uint256 Amount transferred from the signer * @param senderToken address ERC20 token transferred from the sender * @param senderAmount uint256 Amount transferred from the sender * @param v uint8 "v" value of the ECDSA signature * @param r bytes32 "r" value of the ECDSA signature * @param s bytes32 "s" value of the ECDSA signature */ function _check( uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderWallet, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) internal { // Ensure execution on the intended chain if (DOMAIN_CHAIN_ID != block.chainid) revert ChainIdChanged(); // Ensure the expiry is not passed if (expiry <= block.timestamp) revert OrderExpired(); // Recover the signatory from the hash and signature (address signatory, ) = ECDSA.tryRecover( _getOrderHash( nonce, expiry, signerWallet, signerToken, signerAmount, senderWallet, senderToken, senderAmount ), v, r, s ); // Ensure the signatory is not null if (signatory == address(0)) revert SignatureInvalid(); // Ensure signatory is authorized to sign if (authorized[signerWallet] != address(0)) { // If one is set by signer wallet, signatory must be authorized if (signatory != authorized[signerWallet]) revert SignatoryUnauthorized(); } else { // Otherwise, signatory must be signer wallet if (signatory != signerWallet) revert Unauthorized(); } // Ensure the nonce is not yet used and if not mark it used if (!_markNonceAsUsed(signatory, nonce)) revert NonceAlreadyUsed(nonce); } /** * @notice Hash order parameters * @param nonce uint256 * @param expiry uint256 * @param signerWallet address * @param signerToken address * @param signerAmount uint256 * @param senderToken address * @param senderAmount uint256 * @return bytes32 */ function _getOrderHash( uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderWallet, address senderToken, uint256 senderAmount ) internal view returns (bytes32) { return keccak256( abi.encodePacked( "\x19\x01", // EIP191: Indicates EIP712 DOMAIN_SEPARATOR, keccak256( abi.encode( ORDER_TYPEHASH, nonce, expiry, signerWallet, signerToken, signerAmount, protocolFee, senderWallet, senderToken, senderAmount ) ) ) ); } /** * @notice Calculates and transfers protocol fee and rebate * @param sourceToken address * @param sourceWallet address * @param amount uint256 */ function _transferProtocolFee( address sourceToken, address sourceWallet, uint256 amount ) internal { // Transfer fee from signer to feeWallet uint256 feeAmount = (amount * protocolFee) / FEE_DIVISOR; if (feeAmount > 0) { uint256 discountAmount = calculateDiscount( IERC20(staking).balanceOf(msg.sender), feeAmount ); if (discountAmount > 0) { // Transfer fee from signer to sender IERC20(sourceToken).safeTransferFrom( sourceWallet, msg.sender, discountAmount ); // Transfer fee from signer to feeWallet IERC20(sourceToken).safeTransferFrom( sourceWallet, protocolFeeWallet, feeAmount - discountAmount ); } else { IERC20(sourceToken).safeTransferFrom( sourceWallet, protocolFeeWallet, feeAmount ); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol) pragma solidity ^0.8.0; import "./Ownable.sol"; /** * @dev Contract module which provides access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership} and {acceptOwnership}. * * This module is used through inheritance. It will make available all functions * from parent (Ownable). */ abstract contract Ownable2Step is Ownable { address private _pendingOwner; event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner); /** * @dev Returns the address of the pending owner. */ function pendingOwner() public view virtual returns (address) { return _pendingOwner; } /** * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one. * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual override onlyOwner { _pendingOwner = newOwner; emit OwnershipTransferStarted(owner(), newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner. * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual override { delete _pendingOwner; super._transferOwnership(newOwner); } /** * @dev The new owner accepts the ownership transfer. */ function acceptOwnership() external { address sender = _msgSender(); require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner"); _transferOwnership(sender); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; 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)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://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 functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV // Deprecated in v4.8 } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. /// @solidity memory-safe-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/EIP712.sol) pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; address private immutable _CACHED_THIS; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _CACHED_THIS = address(this); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @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. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; interface ISwapERC20 { struct OrderERC20 { uint256 nonce; // Unique number per signatory per order uint256 expiry; // Expiry time (seconds since unix epoch) address signerWallet; // Party to the swap that sets terms address signerToken; // ERC20 token address transferred from signer uint256 signerAmount; // Amount of tokens transferred from signer address senderWallet; // Party to the swap that accepts terms address senderToken; // ERC20 token address transferred from sender uint256 senderAmount; // Amount of tokens transferred from sender uint8 v; // ECDSA bytes32 r; bytes32 s; } event SwapERC20( uint256 indexed nonce, address indexed signerWallet, address signerToken, uint256 signerAmount, uint256 protocolFee, address indexed senderWallet, address senderToken, uint256 senderAmount ); event Cancel(uint256 indexed nonce, address indexed signerWallet); event Authorize(address indexed signer, address indexed signerWallet); event Revoke(address indexed signer, address indexed signerWallet); event SetProtocolFee(uint256 protocolFee); event SetProtocolFeeLight(uint256 protocolFeeLight); event SetProtocolFeeWallet(address indexed feeWallet); event SetRebateScale(uint256 rebateScale); event SetRebateMax(uint256 rebateMax); event SetStaking(address indexed staking); error ChainIdChanged(); error InvalidFee(); error InvalidFeeLight(); error InvalidFeeWallet(); error InvalidStaking(); error OrderExpired(); error MaxTooHigh(); error NonceAlreadyUsed(uint256); error ScaleTooHigh(); error SignatureInvalid(); error SignatoryInvalid(); error SignatoryUnauthorized(); error Unauthorized(); function swap( address recipient, uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external; function swapAnySender( address recipient, uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external; function swapLight( uint256 nonce, uint256 expiry, address signerWallet, address signerToken, uint256 signerAmount, address senderToken, uint256 senderAmount, uint8 v, bytes32 r, bytes32 s ) external; function authorize(address sender) external; function revoke() external; function cancel(uint256[] calldata nonces) external; function nonceUsed(address, uint256) external view returns (bool); function authorized(address) external view returns (address); function calculateProtocolFee( address, uint256 ) external view returns (uint256); }
{ "optimizer": { "enabled": true, "runs": 999999 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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Contract ABI
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"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"swap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"address","name":"signerWallet","type":"address"},{"internalType":"address","name":"signerToken","type":"address"},{"internalType":"uint256","name":"signerAmount","type":"uint256"},{"internalType":"address","name":"senderToken","type":"address"},{"internalType":"uint256","name":"senderAmount","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"swapAnySender","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"address","name":"signerWallet","type":"address"},{"internalType":"address","name":"signerToken","type":"address"},{"internalType":"uint256","name":"signerAmount","type":"uint256"},{"internalType":"address","name":"senderToken","type":"address"},{"internalType":"uint256","name":"senderAmount","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"swapLight","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000007000000000000000000000000b1b586afa8a2aab42826fb2ab9896cd0c686d0f4000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000006400000000000000000000000071070c5607358fc25e3b4aaf4fb0a580c190252a
-----Decoded View---------------
Arg [0] : _protocolFee (uint256): 7
Arg [1] : _protocolFeeLight (uint256): 7
Arg [2] : _protocolFeeWallet (address): 0xb1B586AfA8a2AaB42826Fb2Ab9896CD0c686d0F4
Arg [3] : _rebateScale (uint256): 10
Arg [4] : _rebateMax (uint256): 100
Arg [5] : _staking (address): 0x71070c5607358fc25E3B4aaf4FB0a580c190252a
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [2] : 000000000000000000000000b1b586afa8a2aab42826fb2ab9896cd0c686d0f4
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [5] : 00000000000000000000000071070c5607358fc25e3b4aaf4fb0a580c190252aLoading...LoadingLoading...Loading
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Loading...LoadingLoading...LoadingLoading...LoadingLoading...LoadingLoading...LoadingMultichain Portfolio | 30 Chains
Chain Token Portfolio % Price Amount Value [ Download: CSV Export ]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.
Address QR Code
My Address - Private Name Tag or Note
My Name Tag:
Private Name Tags (up to 35 characters) can be used for easy identification of addressesPrivate Note:
A private note (up to 500 characters) can be attached to this address.
Please DO NOT store any passwords or private keys here.Compiler specific version warnings:
The compiled contract might be susceptible to VerbatimInvalidDeduplication (low-severity), FullInlinerNonExpressionSplitArgumentEvaluationOrder (low-severity), MissingSideEffectsOnSelectorAccess (low-severity) Solidity Compiler Bugs.
Connect a Wallet
Connecting wallet for read function is optional, useful if you want to call certain functions or simply use your wallet's node.Connect a Wallet
Connecting wallet for read function is optional, useful if you want to call certain functions or simply use your wallet's node.Connect a Wallet
Connecting wallet for read function is optional, useful if you want to call certain functions or simply use your wallet's node.Before You Copy
Transaction Private Note
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