IERC165 OFT Interface Ids

Use these interface ids to determine which version of OFT is deployed.

• OFT(v1): 0x14e4ceea
• OFTV2: 0x1f7ecdf7
• OFTWithFee: 0x6984a9e8

interface ERC165 {
    /// @notice Query if a contract implements an interface
    /// @param interfaceID The interface identifier, as specified in ERC-165
    /// @dev Interface identification is specified in ERC-165. This function
    ///  uses less than 30,000 gas.
    /// @return `true` if the contract implements `interfaceID` and
    ///  `interfaceID` is not 0xffffffff, `false` otherwise
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}

info

This method is no longer directly available within LayerZero V2 OFTs. Instead, a custom versioning has been applied within both V2 OApp and OFT.

Example Hardhat Task

module.exports = async function (taskArgs) {
  const OFTInterfaceId = 0x14e4ceea;
  const OFTV2InterfaceId = 0x1f7ecdf7;
  const OFTWithFeeInterfaceId = 0x6984a9e8;

  const ERC165ABI = ['function supportsInterface(bytes4) public view returns (bool)'];

  try {
    const contract = await ethers.getContractAt(ERC165ABI, taskArgs.address);
    const isOFT = await contract.supportsInterface(OFTInterfaceId);
    const isOFTV2 = await contract.supportsInterface(OFTV2InterfaceId);
    const isOFTWithFee = await contract.supportsInterface(OFTWithFeeInterfaceId);

    if (isOFT) {
      console.log(`address: ${taskArgs.address} is OFT(v1)`);
    } else if (isOFTV2) {
      console.log(`address: ${taskArgs.address} is OFTV2`);
    } else if (isOFTWithFee) {
      console.log(`address: ${taskArgs.address} is OFTWithFee`);
    } else {
      console.log(`address: ${taskArgs.address} is not an OFT`);
    }
  } catch (e) {
    console.log('supportsInterface not implemented');
  }
};