ETH Price: $1,811.24 (+10.76%)

Contract

0xf1C374D065719Ce1Fdc63E2c5C13146813c0A83b
 
Transaction Hash
Method
Block
From
To
Onswap181853832025-04-20 20:23:012 days ago1745180581IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000460.00080519
Onswap178759312025-04-13 16:27:579 days ago1744561677IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000780.00110444
Onswap178340442025-04-12 17:11:4310 days ago1744477903IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000001230.00214953
Onswap177153182025-04-09 23:14:1113 days ago1744240451IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000080.0001443
Onswap176251622025-04-07 21:08:5915 days ago1744060139IN
0xf1C374D0...813c0A83b
0.00015 ETH00.00000064
Onswap176153272025-04-07 15:41:0915 days ago1744040469IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000110.000212
Onswap176152962025-04-07 15:40:0715 days ago1744040407IN
0xf1C374D0...813c0A83b
0.00015 ETH00.00000228
Onswap175872102025-04-07 0:03:5516 days ago1743984235IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000002280.00499483
Onswap175871592025-04-07 0:02:1316 days ago1743984133IN
0xf1C374D0...813c0A83b
0.0578 ETH0.00000190.00498778
Onswap175867722025-04-06 23:49:1916 days ago1743983359IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000004650.00497336
Onswap175005182025-04-04 23:54:1118 days ago1743810851IN
0xf1C374D0...813c0A83b
0.025157 ETH0.000000080.000232
Onswap174995952025-04-04 23:23:2518 days ago1743809005IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000080.00020756
Onswap174995212025-04-04 23:20:5718 days ago1743808857IN
0xf1C374D0...813c0A83b
0.00015 ETH0.00000010.00020342
Onswap174942882025-04-04 20:26:3118 days ago1743798391IN
0xf1C374D0...813c0A83b
0.0024 ETH0.000000540.0013076
Onswap174941492025-04-04 20:21:5318 days ago1743798113IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000540.0013076
Onswap174938642025-04-04 20:12:2318 days ago1743797543IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000380.00130561
Onswap174577542025-04-04 0:08:4319 days ago1743725323IN
0xf1C374D0...813c0A83b
0.0445 ETH0.000001370.00100794
Onswap174389022025-04-03 13:40:1919 days ago1743687619IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000170.00048787
Onswap174044182025-04-02 18:30:5120 days ago1743618651IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000030.00007135
Onswap172669532025-03-30 14:08:4123 days ago1743343721IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000001480.00100232
Onswap172669332025-03-30 14:08:0123 days ago1743343681IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000490.00100227
Onswap171490932025-03-27 20:40:0126 days ago1743108001IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000430.00104568
Onswap171300422025-03-27 10:04:5927 days ago1743069899IN
0xf1C374D0...813c0A83b
0.00015 ETH0.000000010.00002296
Onswap171063882025-03-26 20:56:3127 days ago1743022591IN
0xf1C374D0...813c0A83b
0.00015 ETH0.0000010.00099745
Onswap170244422025-03-24 23:24:5929 days ago1742858699IN
0xf1C374D0...813c0A83b
0.02 ETH0.000000960.00196752
View all transactions

Latest 25 internal transactions (View All)

Parent Transaction Hash Block From To
175871592025-04-07 0:02:1316 days ago1743984133
0xf1C374D0...813c0A83b
0.05765 ETH
175005182025-04-04 23:54:1118 days ago1743810851
0xf1C374D0...813c0A83b
0.025007 ETH
174942882025-04-04 20:26:3118 days ago1743798391
0xf1C374D0...813c0A83b
0.00225 ETH
174577542025-04-04 0:08:4319 days ago1743725323
0xf1C374D0...813c0A83b
0.04435 ETH
173067502025-03-31 12:15:1523 days ago1743423315
0xf1C374D0...813c0A83b
0.0036 ETH
170244422025-03-24 23:24:5929 days ago1742858699
0xf1C374D0...813c0A83b
0.01985 ETH
170088242025-03-24 14:44:2329 days ago1742827463
0xf1C374D0...813c0A83b
0.15085 ETH
169711472025-03-23 17:48:2930 days ago1742752109
0xf1C374D0...813c0A83b
0.14985 ETH
168795282025-03-21 14:54:3132 days ago1742568871
0xf1C374D0...813c0A83b
0.002635 ETH
166107382025-03-15 9:34:5139 days ago1742031291
0xf1C374D0...813c0A83b
0.000844 ETH
165841292025-03-14 18:47:5339 days ago1741978073
0xf1C374D0...813c0A83b
0.006664 ETH
163270632025-03-08 19:59:0145 days ago1741463941
0xf1C374D0...813c0A83b
0.003432 ETH
161320942025-03-04 7:40:0350 days ago1741074003
0xf1C374D0...813c0A83b
0.008465 ETH
160956572025-03-03 11:25:2951 days ago1741001129
0xf1C374D0...813c0A83b
0.0072 ETH
160608812025-03-02 16:06:1751 days ago1740931577
0xf1C374D0...813c0A83b
0.002606 ETH
155382482025-02-18 13:45:1163 days ago1739886311
0xf1C374D0...813c0A83b
0.0018 ETH
155380382025-02-18 13:38:1163 days ago1739885891
0xf1C374D0...813c0A83b
0.00105 ETH
154430002025-02-16 8:50:1566 days ago1739695815
0xf1C374D0...813c0A83b
0.14874 ETH
153605482025-02-14 11:01:5168 days ago1739530911
0xf1C374D0...813c0A83b
0.00348 ETH
153605222025-02-14 11:00:5968 days ago1739530859
0xf1C374D0...813c0A83b
0.00348 ETH
152289222025-02-11 9:54:1971 days ago1739267659
0xf1C374D0...813c0A83b
0.00045 ETH
151297862025-02-09 2:49:4773 days ago1739069387
0xf1C374D0...813c0A83b
0.00985 ETH
151210572025-02-08 21:58:4973 days ago1739051929
0xf1C374D0...813c0A83b
0.000348 ETH
150979332025-02-08 9:08:0174 days ago1739005681
0xf1C374D0...813c0A83b
0.008903 ETH
150883592025-02-08 3:48:5374 days ago1738986533
0xf1C374D0...813c0A83b
0.001355 ETH
View All Internal Transactions

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Contract Source Code Verified (Exact Match)

Contract Name:
OnchainSwapV3

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 2000 runs

Other Settings:
default evmVersion
File 1 of 7 : OnchainSwapV3.sol
// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./OnchainGateway.sol";
import '@openzeppelin/contracts/access/Ownable.sol';



contract OnchainSwapV3  is Context, Ownable{

    uint256 public fee = 0.05 ether;

    event ClaimedTokens(address to, uint256 balance);
    event OnchainSwap(address token, uint256 amount, uint256 fee);

    OnchainGateway public onchainGateway;

    constructor() {
        onchainGateway = new OnchainGateway(address(this));
    }

    modifier hasFee() {
        require(msg.value >= fee);
        _;
    }

    function onswap(
        address token,
        uint256 amount,
        address dex,
        address dexgateway,
        bytes memory calldata_
    ) external payable hasFee {

        if(token!=address(0)) {
            onchainGateway.claimTokens(
                token,
                _msgSender(),
                amount
            );

            if (dexgateway == address(0)) {
                forceApprove(token, dex, amount);
            } else {
                forceApprove(token, dexgateway, amount);
            }
        }

        require(dex != address(onchainGateway), "OnchainSwap: call to onchain gateway");

        {
            uint256 size;
            address toCheck = dex;

            assembly {
                size := extcodesize(toCheck)
            }

            require(size != 0, "OnchainSwap: call for a non-contract account");
        }


        (bool swapPassed, ) = dex.call{value: msg.value - fee}(
            calldata_
        );

        require(swapPassed, "OnchainSwap: Fail to call");
        emit OnchainSwap(token, amount, fee);
    }

    function changeFee(uint256 _newFee) public onlyOwner {
        fee = _newFee;
    }

    function claimTokens(address _to) public onlyOwner {
        uint256 balance = address(this).balance;
        (bool sent, ) = _to.call{value: balance}("");
        require(sent, "Failed to send Ether");
        emit ClaimedTokens(_to, balance);
    }

    function forceApprove(address _token, address _recipient, uint256 _value) internal {
        IERC20 erc20token = IERC20(_token);
        if (erc20token.allowance(address(this), _recipient) < _value) {
            SafeERC20.safeApprove(erc20token, _recipient, 0);
            SafeERC20.safeApprove(erc20token, _recipient, type(uint256).max);
        }
    }
}

File 2 of 7 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}

File 3 of 7 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

File 4 of 7 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 5 of 7 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 6 of 7 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

File 7 of 7 : OnchainGateway.sol
// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract OnchainGateway {
    address public onchainSwap;

    modifier onlyOnchainSwap() {
        require(onchainSwap == msg.sender, "Symb: caller is not the onchainSwap");
        _;
    }

    constructor(address _onchainSwap) {
        onchainSwap = _onchainSwap;
    }

    function claimTokens(
        address _token,
        address _from,
        uint256 _amount
    ) external onlyOnchainSwap {
        SafeERC20.safeTransferFrom(IERC20(_token), _from, onchainSwap, _amount);
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"ClaimedTokens","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"OnchainSwap","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"uint256","name":"_newFee","type":"uint256"}],"name":"changeFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"claimTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"onchainGateway","outputs":[{"internalType":"contract OnchainGateway","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"dex","type":"address"},{"internalType":"address","name":"dexgateway","type":"address"},{"internalType":"bytes","name":"calldata_","type":"bytes"}],"name":"onswap","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.