USDTtoETHSwap

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "contracts/USDTtoETHSwap.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.28;\r
\r
/**\r
 * ============================================================\r
 * |            USDT → ETH                                    |\r
 * |            Network: Ethereum Mainnet                     |\r
 * |            Router:  ISwapRouter                          |\r
 * |            Author:  ETH HOST                             |\r
 * ============================================================\r
 */\r
\r
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";\r
\r
\r
interface ISwapRouter {\r
    struct ExactInputSingleParams {\r
        address tokenIn;\r
        address tokenOut;\r
        uint24  fee;\r
        address recipient;\r
        uint256 deadline;\r
        uint256 amountIn;\r
        uint256 amountOutMinimum;\r
        uint160 sqrtPriceLimitX96;\r
    }\r
\r
    function exactInputSingle(ExactInputSingleParams calldata params)\r
        external\r
        payable\r
        returns (uint256 amountOut);\r
}\r
\r
contract USDTtoETHSwap is Ownable {\r
    \r
    address public constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;\r
    address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;\r
    ISwapRouter public constant UNISWAP_ROUTER =\r
        ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);\r
\r
    uint24 public poolFee = 3000;\r
\r
    event Swapped(address indexed user, address indexed recipient, uint256 amountIn, uint256 amountOut);\r
    event Rescue(address indexed token, uint256 amount);\r
    event RescueETH(uint256 amount, address to);\r
    event PoolFeeChanged(uint24 newFee);\r
\r
    constructor(address owner_) Ownable(owner_) {}\r
\r
    /**\r
     * @notice Swap USDT → ETH\r
     * @param amountIn   USDT (6 decimals)\r
     * @param recipient  ETH\r
     * @param minETHOut  min ETH (slippage protection)\r
     */\r
    function swapUSDTforETH(uint256 amountIn, address recipient, uint256 minETHOut)\r
        external\r
        returns (uint256 amountOut)\r
    {\r
        require(amountIn > 0, "amountIn=0");\r
        require(recipient != address(0), "recipient=0");\r
\r
        \r
        IERC20(USDT).transferFrom(msg.sender, address(this), amountIn);\r
\r
        \r
        IERC20(USDT).approve(address(UNISWAP_ROUTER), 0);\r
        IERC20(USDT).approve(address(UNISWAP_ROUTER), amountIn);\r
\r
        \r
        ISwapRouter.ExactInputSingleParams memory params = ISwapRouter.ExactInputSingleParams({\r
            tokenIn: USDT,\r
            tokenOut: WETH,\r
            fee: poolFee,\r
            recipient: address(this),\r
            deadline: block.timestamp + 300,\r
            amountIn: amountIn,\r
            amountOutMinimum: minETHOut,\r
            sqrtPriceLimitX96: 0\r
        });\r
\r
        \r
        amountOut = UNISWAP_ROUTER.exactInputSingle(params);\r
        require(amountOut > 0, "no output");\r
\r
        \r
        (bool unwrapOk, ) = WETH.call(abi.encodeWithSignature("withdraw(uint256)", amountOut));\r
        require(unwrapOk, "unwrap failed");\r
\r
        \r
        (bool sent, ) = payable(recipient).call{value: amountOut}("");\r
        require(sent, "send failed");\r
\r
        emit Swapped(msg.sender, recipient, amountIn, amountOut);\r
    }\r
\r
    \r
    function setPoolFee(uint24 newFee) external onlyOwner {\r
        require(newFee == 500 || newFee == 3000 || newFee == 10000, "invalid fee");\r
        poolFee = newFee;\r
        emit PoolFeeChanged(newFee);\r
    }\r
\r
    \r
    function rescueToken(address token, uint256 amount) external onlyOwner {\r
        IERC20(token).transfer(owner(), amount);\r
        emit Rescue(token, amount);\r
    }\r
\r
    \r
    function rescueETH(uint256 amount) external onlyOwner {\r
        require(address(this).balance >= amount, "insufficient ETH");\r
        payable(owner()).transfer(amount);\r
        emit RescueETH(amount, owner());\r
    }\r
\r
    receive() external payable {}\r
}\r
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}