Address Details
contract
proxy

0x190480908c11Efca37EDEA4405f4cE1703b68b23

Contract Name
ExchangeProxy
Creator
0x0cc59e–f1502d at 0xc5dccd–52e610
Implementation
0x247c0533bb47aeb3633336982ed3478dab1ea616
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
232,517 Transactions
Transfers
175,384 Transfers
Gas Used
38,812,803,156
Last Balance Update
19159320
Contract name:
ExchangeProxy




Optimization enabled
false
Is a Proxy?
true




Implementation Name:
Exchange
Compiler version
v0.5.8+commit.23d335f2




Verified at
2020-08-11T19:10:47.570525Z

Contract source code

pragma solidity ^0.5.3;


library Address {
    
    function isContract(address account) internal view returns (bool) {
        
        
        
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    
    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");
    }
}

contract Proxy {
  
  bytes32 private constant OWNER_POSITION = bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1);
  
  bytes32 private constant IMPLEMENTATION_POSITION = bytes32(
    uint256(keccak256("eip1967.proxy.implementation")) - 1
  );

  event OwnerSet(address indexed owner);
  event ImplementationSet(address indexed implementation);

  constructor() public {
    _setOwner(msg.sender);
  }

  
  modifier onlyOwner() {
    require(msg.sender == _getOwner(), "sender was not owner");
    _;
  }

  
  function() external payable {
    bytes32 implementationPosition = IMPLEMENTATION_POSITION;

    address implementationAddress;

    
    assembly {
      implementationAddress := sload(implementationPosition)
    }

    
    
    require(implementationAddress != address(0), "No Implementation set");
    require(Address.isContract(implementationAddress), "Invalid contract address");

    assembly {
      
      let newCallDataPosition := mload(0x40)
      mstore(0x40, add(newCallDataPosition, calldatasize))
      calldatacopy(newCallDataPosition, 0, calldatasize)

      
      
      let delegatecallSuccess := delegatecall(
        gas,
        implementationAddress,
        newCallDataPosition,
        calldatasize,
        0,
        0
      )

      
      let returnDataSize := returndatasize
      let returnDataPosition := mload(0x40)
      mstore(0x40, add(returnDataPosition, returnDataSize))
      returndatacopy(returnDataPosition, 0, returnDataSize)

      
      switch delegatecallSuccess
        case 0 {
          revert(returnDataPosition, returnDataSize)
        }
        default {
          return(returnDataPosition, returnDataSize)
        }
    }
  }

  
  function _transferOwnership(address newOwner) external onlyOwner {
    _setOwner(newOwner);
  }

  
  function _setAndInitializeImplementation(address implementation, bytes calldata callbackData)
    external
    payable
    onlyOwner
  {
    _setImplementation(implementation);
    bool success;
    bytes memory returnValue;
    (success, returnValue) = implementation.delegatecall(callbackData);
    require(success, "initialization callback failed");
  }

  
  function _getImplementation() external view returns (address implementation) {
    bytes32 implementationPosition = IMPLEMENTATION_POSITION;
    
    assembly {
      implementation := sload(implementationPosition)
    }
  }

  
  function _setImplementation(address implementation) public onlyOwner {
    bytes32 implementationPosition = IMPLEMENTATION_POSITION;

    require(Address.isContract(implementation), "Invalid contract address");

    
    assembly {
      sstore(implementationPosition, implementation)
    }

    emit ImplementationSet(implementation);
  }

  
  function _getOwner() public view returns (address owner) {
    bytes32 position = OWNER_POSITION;
    
    assembly {
      owner := sload(position)
    }
  }

  function _setOwner(address newOwner) private {
    require(newOwner != address(0), "owner cannot be 0");
    bytes32 position = OWNER_POSITION;
    
    assembly {
      sstore(position, newOwner)
    }
    emit OwnerSet(newOwner);
  }
}

contract ExchangeProxy is Proxy {}

Contract ABI

[{"type":"function","stateMutability":"payable","payable":true,"outputs":[],"name":"_setAndInitializeImplementation","inputs":[{"type":"address","name":"implementation"},{"type":"bytes","name":"callbackData"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"implementation"}],"name":"_getImplementation","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"_setImplementation","inputs":[{"type":"address","name":"implementation"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"_transferOwnership","inputs":[{"type":"address","name":"newOwner"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"owner"}],"name":"_getOwner","inputs":[],"constant":true},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"event","name":"OwnerSet","inputs":[{"type":"address","name":"owner","indexed":true}],"anonymous":false},{"type":"event","name":"ImplementationSet","inputs":[{"type":"address","name":"implementation","indexed":true}],"anonymous":false}]

Contract Creation Code

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Deployed ByteCode

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