Address Details
contract

0x612cF8a29A9c8965a5fE512b7463165861c07EAa

Contract Name
ERC20FeeProxy
Creator
0x8b4b31–3cca2f at 0x86403b–b14ef8
Balance
0 CELO ( )
Locked CELO Balance
0.00 CELO
Voting CELO Balance
0.00 CELO
Pending Unlocked Gold
0.00 CELO
Tokens
Fetching tokens...
Transactions
0 Transactions
Transfers
0 Transfers
Gas Used
Fetching gas used...
Last Balance Update
19657503
This contract has been verified via Sourcify. View contract in Sourcify repository
Contract name:
ERC20FeeProxy




Optimization enabled
true
Compiler version
v0.5.17+commit.d19bba13




Optimization runs
200
EVM Version
istanbul




Verified at
2021-06-03T16:09:26.909414Z

Contract source code

pragma solidity ^0.5.0;


/**
 * @title ERC20FeeProxy
 * @notice This contract performs an ERC20 token transfer, with a Fee sent to a third address and stores a reference
 */
contract ERC20FeeProxy {
  // Event to declare a transfer with a reference
  event TransferWithReferenceAndFee(
    address tokenAddress,
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  // Fallback function returns funds to the sender
  function() external payable {
    revert("not payable fallback");
  }

  /**
    * @notice Performs a ERC20 token transfer with a reference and a transfer to a second address for the payment of a fee
    * @param _tokenAddress Address of the ERC20 token smart contract
    * @param _to Transfer recipient
    * @param _amount Amount to transfer
    * @param _paymentReference Reference of the payment related
    * @param _feeAmount The amount of the payment fee
    * @param _feeAddress The fee recipient
    */
  function transferFromWithReferenceAndFee(
    address _tokenAddress,
    address _to,
    uint256 _amount,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address _feeAddress
    ) external
    {
    require(safeTransferFrom(_tokenAddress, _to, _amount), "payment transferFrom() failed");
    if (_feeAmount > 0 && _feeAddress != address(0)) {
      require(safeTransferFrom(_tokenAddress, _feeAddress, _feeAmount), "fee transferFrom() failed");
    }
    emit TransferWithReferenceAndFee(
      _tokenAddress,
      _to,
      _amount,
      _paymentReference,
      _feeAmount,
      _feeAddress
    );
  }

  /**
   * @notice Call transferFrom ERC20 function and validates the return data of a ERC20 contract call.
   * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
   * @return The return value of the ERC20 call, returning true for non-standard tokens
   */
  function safeTransferFrom(address _tokenAddress, address _to, uint256 _amount) internal returns (bool result) {
    /* solium-disable security/no-inline-assembly */
    // check if the address is a contract
    assembly {
      if iszero(extcodesize(_tokenAddress)) { revert(0, 0) }
    }
    
    // solium-disable-next-line security/no-low-level-calls
    (bool success, ) = _tokenAddress.call(abi.encodeWithSignature(
      "transferFrom(address,address,uint256)",
      msg.sender,
      _to,
      _amount
    ));

    assembly {
        switch returndatasize()
        case 0 { // not a standard erc20
            result := 1
        }
        case 32 { // standard erc20
            returndatacopy(0, 0, 32)
            result := mload(0)
        }
        default { // anything else, should revert for safety
            revert(0, 0)
        }
    }

    require(success, "transferFrom() has been reverted");

    /* solium-enable security/no-inline-assembly */
    return result;
  }
}

Contract ABI

[{"type":"event","name":"TransferWithReferenceAndFee","inputs":[{"type":"address","name":"tokenAddress","internalType":"address","indexed":false},{"type":"address","name":"to","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false},{"type":"bytes","name":"paymentReference","internalType":"bytes","indexed":true},{"type":"uint256","name":"feeAmount","internalType":"uint256","indexed":false},{"type":"address","name":"feeAddress","internalType":"address","indexed":false}],"anonymous":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferFromWithReferenceAndFee","inputs":[{"type":"address","name":"_tokenAddress","internalType":"address"},{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"},{"type":"bytes","name":"_paymentReference","internalType":"bytes"},{"type":"uint256","name":"_feeAmount","internalType":"uint256"},{"type":"address","name":"_feeAddress","internalType":"address"}],"constant":false}]

Contract Creation Code

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Deployed ByteCode

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