FlashLoanExample

{{
  "language": "Solidity",
  "sources": {
    "contracts/Flash Loan Chat GPT.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
/*\r
 * Minimal educational flash-loan template\r
 * (structure only – not profitable or production-ready)\r
 */\r
\r
interface IERC20 {\r
    function balanceOf(address) external view returns (uint256);\r
    function allowance(address, address) external view returns (uint256);\r
    function approve(address, uint256) external returns (bool);\r
}\r
\r
interface IAavePool {\r
    function flashLoanSimple(\r
        address receiver,\r
        address asset,\r
        uint256 amount,\r
        bytes calldata params,\r
        uint16 referralCode\r
    ) external;\r
}\r
\r
interface IFlashLoanSimpleReceiver {\r
    function executeOperation(\r
        address asset,\r
        uint256 amount,\r
        uint256 premium,\r
        address initiator,\r
        bytes calldata params\r
    ) external returns (bool);\r
}\r
\r
contract FlashLoanExample is IFlashLoanSimpleReceiver {\r
    address public immutable owner;\r
    IAavePool public immutable pool;\r
    IERC20 public immutable token;\r
\r
    modifier onlyOwner() {\r
        require(msg.sender == owner, "not owner");\r
        _;\r
    }\r
\r
    constructor(address _pool, address _token) {\r
        owner = msg.sender;\r
        pool = IAavePool(_pool);\r
        token = IERC20(_token);\r
    }\r
\r
    function initiate(uint256 amount) external onlyOwner {\r
        bytes memory params = ""; // no parameters\r
        pool.flashLoanSimple(address(this), address(token), amount, params, 0);\r
    }\r
\r
    function executeOperation(\r
        address asset,\r
        uint256 amount,\r
        uint256 premium,\r
        address initiator,\r
        bytes calldata /*params*/\r
    ) external override returns (bool) {\r
        require(msg.sender == address(pool), "bad caller");\r
        require(initiator == address(this), "bad initiator");\r
        require(asset == address(token), "asset mismatch");\r
\r
        // your logic here (e.g. trades)\r
\r
        // repay the loan + fee\r
        uint256 totalOwed = amount + premium;\r
        token.approve(address(pool), totalOwed);\r
        return true;\r
    }\r
}\r
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}