Contract 0x3e5d9d8a63cc8a88748f229999cf59487e90721e 15

 
Txn Hash Method
Block
From
To
Value
0xdc6de7976152be977b0202483b1dc0173757283918e7dc1cbee47879c8ded4c3Approve1130830442023-12-05 8:27:453 days 11 hrs ago0x90d20fda272f341b1a0b3a5dd6ee21f5a8626904 IN  MetalSwap: XMT Token0 ETH0.000077559810.00955869
0xd8ff94c6ac06c53de18a4f8e6e1bf924e6eff1412444c0da32faa365fd943838Transfer1130829792023-12-05 8:25:353 days 11 hrs ago0xfb4a9d03592ed490992523ec551ba9290bfc4a08 IN  MetalSwap: XMT Token0 ETH0.0000803426360.009590849
0xb7213a71c06340bfadb3a8d63edd332b8c81869816b609314039296fcaefbd3eTransfer1130828902023-12-05 8:22:373 days 11 hrs ago0x6bd0483b78af6ddbb2fa6d001977de16fb648519 IN  MetalSwap: XMT Token0 ETH0.0000775860210.011625811
0x4a957a0323c1fa33f0a68532d285f77634c05e9d3f008e7606800dd0932ad27dTransfer1130828772023-12-05 8:22:113 days 11 hrs ago0xc83e45fd750ab004b303a88b5c84303a1e2e1e82 IN  MetalSwap: XMT Token0 ETH0.0000798501570.009287475
0xed7ff3a2688837cf5109dceca9b5b880c510f58e2a1f80165ca59e72ea0a7364Transfer1130828642023-12-05 8:21:453 days 11 hrs ago0xf90b30d09e3cf991198261ec90e3fd35ad6a7fd7 IN  MetalSwap: XMT Token0 ETH0.0000738316440.009060815
0x00eea1ed9e26743c128735a3a1ee12ef9763633fd8fb8597991114f8d38280b4Approve1118690212023-11-07 6:00:1931 days 13 hrs ago0xf63d00f6ea6c1158d05abd4fc2d3676604db54c3 IN  MetalSwap: XMT Token0 ETH0.000040316210.011559287
0xee948c49df6fbde18e6c4cc6ab41587b85ac66911c36d610cad60fa869fe4f83Approve1118680032023-11-07 5:26:2331 days 14 hrs ago0xf63d00f6ea6c1158d05abd4fc2d3676604db54c3 IN  MetalSwap: XMT Token0 ETH0.0000388853180.011208955
0x169f5fdce1a778819fb3b72d2b6d22a7e4982d359690faa2bf2efa2112351fb4Approve1116632242023-11-02 11:40:2536 days 8 hrs ago0x90d20fda272f341b1a0b3a5dd6ee21f5a8626904 IN  MetalSwap: XMT Token0 ETH0.0000387478370.009097824
0x89135596460c5128650bd7bf1edb8b539155daa10113b6a0acafd75400f12b6eTransfer1116630592023-11-02 11:34:5536 days 8 hrs ago0x313bdcecfd0cd794195b5022932913c476a939d4 IN  MetalSwap: XMT Token0 ETH0.0000506338270.009492464
0xdc062f48ff4b305d42510ac8e7f247373f7402146d3de3849c54111467bf76a5Transfer1116630292023-11-02 11:33:5536 days 8 hrs ago0xfb4a9d03592ed490992523ec551ba9290bfc4a08 IN  MetalSwap: XMT Token0 ETH0.0000538288230.009716031
0x244ecc636bc8f78d917a9dd01f0638c7eebf1dfc5f55a1d0227345f5b5a19f16Transfer1116630182023-11-02 11:33:3336 days 8 hrs ago0xab5eb14857cbcabbad63549ce6dc62bce165ede7 IN  MetalSwap: XMT Token0 ETH0.0000578159560.010029482
0x14681cca6bc3832439de400acdb3753529cfb2d5da3e523e36e68082cce67fe2Transfer1116630062023-11-02 11:33:0936 days 8 hrs ago0x6bd0483b78af6ddbb2fa6d001977de16fb648519 IN  MetalSwap: XMT Token0 ETH0.0000545100270.009242452
0x346ab3ff2b21f48a8afdb30a8c683f6e660dfcdb57804bb3b675403210e97543Transfer1116629922023-11-02 11:32:4136 days 8 hrs ago0xc83e45fd750ab004b303a88b5c84303a1e2e1e82 IN  MetalSwap: XMT Token0 ETH0.0000581191870.009901729
0x24b42f9264a8e81fb8740300e43357dca289798a1fbf9835b661658c1c2d0062Transfer1116629762023-11-02 11:32:0936 days 8 hrs ago0xf90b30d09e3cf991198261ec90e3fd35ad6a7fd7 IN  MetalSwap: XMT Token0 ETH0.000049363410.009516643
0xfd0f9b6c5a0fe6ac4232c3df25550801dc5029eb4285a56d980f933684da3f29Transfer1116247352023-11-01 14:17:2737 days 5 hrs ago0xf2ab089a4aee12d57c2c4cde00cbc56f5a9a0e16 IN  MetalSwap: XMT Token0 ETH0.0000516726480.010595313
0x6e465a8782ac7b6df2dbbdbffe606164190afc1ec9d82f7e2d8a6221c4b720c2Transfer1111518882023-10-21 15:35:5348 days 4 hrs ago0x759230a3dbf6c59527372f4eaf5627fc357937d1 IN  MetalSwap: XMT Token0 ETH0.0000183156020.010358796
0x79717a42162719ff5bc809b1b2661ee3e290c9f8aa49cd3a68d17976b6e66e4aTransfer1111518022023-10-21 15:33:0148 days 4 hrs ago0x759230a3dbf6c59527372f4eaf5627fc357937d1 IN  MetalSwap: XMT Token0 ETH0.000020891520.010551863
0x18139bc5b07af9b5ed6072605d0bd7ea28a13fa157afccf1f7d24afcd5a2c242Approve1109692002023-10-17 10:06:1752 days 9 hrs ago0x1716d25030565f290dff775ad19ea377b78ab9bb IN  MetalSwap: XMT Token0 ETH0.0000123270690.011900252
0x366b7de01b2e845f0760bed57f53d7952182623a28acb695e27fb5f6ebc3aec5Transfer1109691382023-10-17 10:04:1352 days 9 hrs ago0x1ec2877f1d81c79f083ba2db9348f2b07b0b6b8f IN  MetalSwap: XMT Token0 ETH0.0000112648170.012011758
0xcf9ddc319b69dfa6beec68b66dba6f88018069a5b0d9cbf5cdb49545aca9ae78Approve1109654482023-10-17 8:01:1352 days 11 hrs ago0x1716d25030565f290dff775ad19ea377b78ab9bb IN  MetalSwap: XMT Token0 ETH0.0000129900830.020156745
0xd6aef18ae15a0d44eac6cd4f9cb9b61903d0b9a1b4ae9d69a927c0c03f327bb1Approve1109292732023-10-16 11:55:2353 days 7 hrs ago0x90d20fda272f341b1a0b3a5dd6ee21f5a8626904 IN  MetalSwap: XMT Token0 ETH0.000011230080.015119995
0x7fe8b0c89474be0c6a017135c4bb88d447fba4ec4e7e81553692d1ec7b2699b6Transfer1109290832023-10-16 11:49:0353 days 8 hrs ago0xab5eb14857cbcabbad63549ce6dc62bce165ede7 IN  MetalSwap: XMT Token0 ETH0.0000114638410.016080786
0x5b189e3d0ff6dc0396ba7901f5ac18ff1a606d73e589c8b063cca463bbe1c5dfTransfer1109290512023-10-16 11:47:5953 days 8 hrs ago0x6bd0483b78af6ddbb2fa6d001977de16fb648519 IN  MetalSwap: XMT Token0 ETH0.0000125247790.016045852
0x51a7114b2ea54c53df4113b3fbe409088b0ad09dcc01758459d1fe6a436a95a0Transfer1109290122023-10-16 11:46:4153 days 8 hrs ago0xc83e45fd750ab004b303a88b5c84303a1e2e1e82 IN  MetalSwap: XMT Token0 ETH0.0000120214260.016440409
0xe96bf4e4ac2c70a81f77e1c2f6b40eaf98605171c3fd5ac9f3949fe79e50b964Transfer1109289722023-10-16 11:45:2153 days 8 hrs ago0xf90b30d09e3cf991198261ec90e3fd35ad6a7fd7 IN  MetalSwap: XMT Token0 ETH0.0000128207380.016093129
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OVERVIEW

A decentralized platform that allows hedging swaps on financial markets providing a coverage to those working with commodities and investment opportunities for those who contribute to the shared liquidity of the project.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x212abacb979cdf2532b036fccc59f0ea66e80896fda00cca1e593195f1a043cb1075570272023-07-30 10:27:11131 days 9 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x212abacb979cdf2532b036fccc59f0ea66e80896fda00cca1e593195f1a043cb1075570272023-07-30 10:27:11131 days 9 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x6776283b74f7c8855e1256a612aa4ed438c2046c4a16a84cd2c9fd5f090018391075530742023-07-30 8:15:25131 days 11 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x6776283b74f7c8855e1256a612aa4ed438c2046c4a16a84cd2c9fd5f090018391075530742023-07-30 8:15:25131 days 11 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x4397241a87ee772fa0539421d09d073484125201b5a53108ab5e272f324a76461075470342023-07-30 4:54:05131 days 15 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x4397241a87ee772fa0539421d09d073484125201b5a53108ab5e272f324a76461075470342023-07-30 4:54:05131 days 15 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x39c44b469025ba535c9412e55354d4436a2cd946c40a78786f9f2bffee4e4af61075286882023-07-29 18:42:33132 days 1 hr ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x39c44b469025ba535c9412e55354d4436a2cd946c40a78786f9f2bffee4e4af61075286882023-07-29 18:42:33132 days 1 hr ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x51354f67b5bec21c67447dd68c7ef06dfcf29458a7d9509b77c3c8b3b33cc95d1075280532023-07-29 18:21:23132 days 1 hr ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x51354f67b5bec21c67447dd68c7ef06dfcf29458a7d9509b77c3c8b3b33cc95d1075280532023-07-29 18:21:23132 days 1 hr ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xf3a8923eb0b4bad77823eba8b8b0451b4840770153099e964f9c0c2ad93883941075234342023-07-29 15:47:25132 days 4 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xf3a8923eb0b4bad77823eba8b8b0451b4840770153099e964f9c0c2ad93883941075234342023-07-29 15:47:25132 days 4 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x504ea9f8f5a3ee3552c6aa75ae3c5cc2c8ccae6c769cae47bb4eb6df0ef6038c1075234172023-07-29 15:46:51132 days 4 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x504ea9f8f5a3ee3552c6aa75ae3c5cc2c8ccae6c769cae47bb4eb6df0ef6038c1075234172023-07-29 15:46:51132 days 4 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x44783ae530d7eb4fdab647e8cc6c312717b7635cd2c611f2e1f63cdf9831b0a91075134462023-07-29 10:14:29132 days 9 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x44783ae530d7eb4fdab647e8cc6c312717b7635cd2c611f2e1f63cdf9831b0a91075134462023-07-29 10:14:29132 days 9 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x76c8f974d39b98f0b32af9b39cee2732d902634972c1b0666c61c66f1de2387e1075125892023-07-29 9:45:55132 days 10 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x76c8f974d39b98f0b32af9b39cee2732d902634972c1b0666c61c66f1de2387e1075125892023-07-29 9:45:55132 days 10 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x219103cae238ac6f4b77e98a624758e8458636652dd3214986866d9eff1a2b4a1075087632023-07-29 7:38:23132 days 12 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x219103cae238ac6f4b77e98a624758e8458636652dd3214986866d9eff1a2b4a1075087632023-07-29 7:38:23132 days 12 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xe3ef6388ada9facf089dbee97f7780b38df6609af5ac1a80406685df1b414a5d1075043392023-07-29 5:10:55132 days 14 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xe3ef6388ada9facf089dbee97f7780b38df6609af5ac1a80406685df1b414a5d1075043392023-07-29 5:10:55132 days 14 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xae98f85b80fd6d157380e45ab48e87cc2c0e200ca490823d99d35abb7cae97c61075037362023-07-29 4:50:49132 days 15 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0xae98f85b80fd6d157380e45ab48e87cc2c0e200ca490823d99d35abb7cae97c61075037362023-07-29 4:50:49132 days 15 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
0x6b106f3e430c658a3b708d28987727c1b67bc3a31ff0ae1cc52da28cb0bcf68c1075037262023-07-29 4:50:29132 days 15 hrs ago 0x4d358448863a6a3ee228fb8e1d68697747b7e845 MetalSwap: XMT Token0 ETH
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
MetalSwap

Compiler Version
v0.8.18+commit.87f61d96

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2023-06-02
*/

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/Context.sol


// 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: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// File: https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/standards/IL2StandardERC20.sol


pragma solidity ^0.8.9;



interface IL2StandardERC20 is IERC20, IERC165 {
    function l1Token() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;

    event Mint(address indexed _account, uint256 _amount);
    event Burn(address indexed _account, uint256 _amount);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// File: https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/standards/L2StandardERC20.sol


pragma solidity ^0.8.9;



contract L2StandardERC20 is IL2StandardERC20, ERC20 {
    address public l1Token;
    address public l2Bridge;

    /**
     * @param _l2Bridge Address of the L2 standard bridge.
     * @param _l1Token Address of the corresponding L1 token.
     * @param _name ERC20 name.
     * @param _symbol ERC20 symbol.
     */
    constructor(
        address _l2Bridge,
        address _l1Token,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol) {
        l1Token = _l1Token;
        l2Bridge = _l2Bridge;
    }

    modifier onlyL2Bridge() {
        require(msg.sender == l2Bridge, "Only L2 Bridge can mint and burn");
        _;
    }

    // slither-disable-next-line external-function
    function supportsInterface(bytes4 _interfaceId) public pure returns (bool) {
        bytes4 firstSupportedInterface = bytes4(keccak256("supportsInterface(bytes4)")); // ERC165
        bytes4 secondSupportedInterface = IL2StandardERC20.l1Token.selector ^
            IL2StandardERC20.mint.selector ^
            IL2StandardERC20.burn.selector;
        return _interfaceId == firstSupportedInterface || _interfaceId == secondSupportedInterface;
    }

    // slither-disable-next-line external-function
    function mint(address _to, uint256 _amount) public virtual onlyL2Bridge {
        _mint(_to, _amount);

        emit Mint(_to, _amount);
    }

    // slither-disable-next-line external-function
    function burn(address _from, uint256 _amount) public virtual onlyL2Bridge {
        _burn(_from, _amount);

        emit Burn(_from, _amount);
    }
}

// File: Optimism_Swap_System/contracts/tokens/XMT_OP.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;


contract MetalSwap is L2StandardERC20 {

    constructor () L2StandardERC20(0x4200000000000000000000000000000000000010, 0x3E5D9D8a63CC8a88748f229999CF59487e90721e, "MetalSwap", "XMT") {
        
    }

}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://a5c7429904a771650b0623ef3f23931f3d873d00b0826dbc6903137d0b6deec1
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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