Contract 0x9e1028f5f1d5ede59748ffcee5532509976840e0 18

 
Txn Hash Method
Block
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Value
0x1115e72bc465bd75b2d6fbec9577884849142f0e89501bce10c016ddff90049dApprove1180575932024-03-29 12:06:032 hrs 42 mins ago0x0ab24cab9988ff6e8479a7cb9c3c6b2a71d00e11 IN  Perpetual Protocol: PERP Token0 ETH0.0000058233570.030132403
0x65fd62e50d557fa53f2e881a9f9200c67aad13a5d0284c1cacf853b599a4208aApprove1180560372024-03-29 11:14:113 hrs 34 mins ago0xd2af0b9446abf5e2987113bf539fe05baf52de5d IN  Perpetual Protocol: PERP Token0 ETH0.0000021571770.031534682
0x3850c18ca8ab085373ac12eea439a212e1f20028597115e01b0987a468a5929dApprove1180558092024-03-29 11:06:353 hrs 42 mins ago0xfe2623b65c3433f4a1ea810e29bc6cb040a9c94a IN  Perpetual Protocol: PERP Token0 ETH0.000001997070.030342883
0x0227e21b0c877012c02d78b6f6ad160c23d3ea18b4ae964b715eb3c571707279Approve1180556952024-03-29 11:02:473 hrs 45 mins ago0xeb8f7b8c27732e00bef318441422000d8ccd1e54 IN  Perpetual Protocol: PERP Token0 ETH0.000001997230.030429564
0x544ea185d4c49744263eb5a25e2c31d656dae05c8a6ed4fdfe71b82c44b1017bApprove1180530162024-03-29 9:33:295 hrs 15 mins ago0x28228caabe68d0886cb31cb2fce954ae057658ee IN  Perpetual Protocol: PERP Token0 ETH0.0000021165030.031515238
0x7dfc92e223b1e77feaa49f9e3da495500610ebbe429fcba95991470584f1f27aApprove1180519652024-03-29 8:58:275 hrs 50 mins ago0xa7a2e2644a60aab51a978bed6a4e9956f1bee4af IN  Perpetual Protocol: PERP Token0 ETH0.0000023138850.030439304
0x36348ce1494823d790a91789f4cf026c1fd97c60387d76c9b8a751d5eac0657bApprove1180468372024-03-29 6:07:318 hrs 41 mins ago0xcc34a385bfdf725987e3c83720866581974d5df5 IN  Perpetual Protocol: PERP Token0 ETH0.0000020730210.0310997
0x045a78d07ecef3d08386256df23fb8a043287781f48e3c4a1480927da97d8693Approve1180449642024-03-29 5:05:059 hrs 43 mins ago0x73892a3a82048dee71ac7b1eed555511b69d7067 IN  Perpetual Protocol: PERP Token0 ETH0.0000033498560.030598066
0x5f21a542eecbd582303331f94aa67a473772ca8327442acb3f9345528583dc26Approve1180422302024-03-29 3:33:5711 hrs 14 mins ago0xb498df7db00b2dfa5f0db39c3c6399e7c643d8aa IN  Perpetual Protocol: PERP Token0 ETH0.0000096917980.03123863
0x6cee1e06c0dd9a9ec5b1a5cfae97b4abeb73b6933f62b0c0ee3d40db96998ddbApprove1180412072024-03-29 2:59:5111 hrs 48 mins ago0x33b2ad24a6130e7a76f09ac9a79519b08576e17a IN  Perpetual Protocol: PERP Token0 ETH0.0000064137590.030183887
0xf2de86db8f436d503ce8bb500ea3066c5c7fce2657415a243ebfbf4cf74e5a64Approve1180407042024-03-29 2:43:0512 hrs 5 mins ago0x0e3bf75acf392f60cd78896dd09937d3d8a4c5bd IN  Perpetual Protocol: PERP Token0 ETH0.0000041538230.030486667
0xd9026eb6fd6deb16ba27d33112673d784125f973f4b761ea2f2f63c5807dc91bApprove1180356482024-03-28 23:54:3314 hrs 54 mins ago0x1de571f1f064b9d02d9ba50688b2cb026aee6e8e IN  Perpetual Protocol: PERP Token0 ETH0.0000041560950.030340712
0x22d099d1906a080897225675ae1275fc3bba1e86bc447ad5e99d62ca12c1e7e8Approve1180306992024-03-28 21:09:3517 hrs 39 mins ago0x85c10a8d6e154ed51ab0a20f9ae02996c40a3266 IN  Perpetual Protocol: PERP Token0 ETH0.0000019219540.030050472
0x5499ccbd8e22fc1508f197a14651e8e9af25d50fab1e967cabe4f85aefc5806bApprove1180306792024-03-28 21:08:5517 hrs 39 mins ago0xbbac64be7f5c9d11edd754813e1717570c51fe83 IN  Perpetual Protocol: PERP Token0 ETH0.0000019505930.031536464
0x3aea06a0ce7369eae6e43684c3097f3453ebe8faa42ce77478e33f14a9db41bcApprove1180217982024-03-28 16:12:5322 hrs 35 mins ago0x592fd5d5709baddba2986bfcd62995f45e0ed957 IN  Perpetual Protocol: PERP Token0 ETH0.0000100882040.030357517
0x31386d4c8a956db9709fcb141b7b69f9c0133d066efbc37a865a3c480c390200Approve1180153072024-03-28 12:36:311 day 2 hrs ago0xc19b286f632658400a7d8e6793dc866fc1ede2de IN  Perpetual Protocol: PERP Token0 ETH0.0000024761230.029853236
0x8089f020751f941e35b565c8eb3f239926b83d5835a3952ee432b61351e7b658Approve1180120432024-03-28 10:47:431 day 4 hrs ago0x43924ead91525457d86c5556b8eaa5676ae593d9 IN  Perpetual Protocol: PERP Token0 ETH0.000003634150.029332687
0x1365c68b0eca9877ec421ee169f67f756a6181254cc9537d161b10b9aaa6274aApprove1180112872024-03-28 10:22:311 day 4 hrs ago0x636027d143979ef62308aa605b4169d2875f8a81 IN  Perpetual Protocol: PERP Token0 ETH0.0000035166570.029035954
0x9ee3be499e161a18158089adac3f5e2cb77cb0a112e8175ae6597105a11530f2Approve1180083662024-03-28 8:45:091 day 6 hrs ago0x53d8931f5b6071d85bbf871253d5767756edf0c2 IN  Perpetual Protocol: PERP Token0 ETH0.0000088619680.045440657
0xbd999ce1c2c987fee54d289c671f1e9701af4115a2084ffeef4cf29bdedede1aApprove1180073182024-03-28 8:10:131 day 6 hrs ago0xcd3c1e044bd11c4bac04017b02427c3872361190 IN  Perpetual Protocol: PERP Token0 ETH0.0000070068050.045444861
0xc42917fe3f9c9c73de3cb7bb5ae947050c14378bb18c75283824631e59baa9b2Approve1180067642024-03-28 7:51:451 day 6 hrs ago0x58ee104c00effd107263b446c2557659800fa155 IN  Perpetual Protocol: PERP Token0 ETH0.0000052435380.044406336
0xc97f56fdade9f78a2ffd29e4ef668456e2f499a4d10951054ae812d069c82c2dApprove1180064942024-03-28 7:42:451 day 7 hrs ago0x81aea4e70d57f07bfce3afc9781aa22ba19f1f38 IN  Perpetual Protocol: PERP Token0 ETH0.0000054562230.028509214
0x49418852753407db73d9981db36328f6f2860193fc540d8e31a8bb64e13c2148Approve1180060132024-03-28 7:26:431 day 7 hrs ago0x5d32e91be8ef9fdf1ce926f63db341418093851e IN  Perpetual Protocol: PERP Token0 ETH0.0000045491940.03403
0x0c123a328867d0d0d58818e1f698ffa5e474ca9f54e280f8f82f30792d547e16Approve1180025882024-03-28 5:32:331 day 9 hrs ago0x4f99900569fbc18c5d6a1da65eede8b8925230e8 IN  Perpetual Protocol: PERP Token0 ETH0.0000040617320.028958925
0xdd5121e6a719c0725002230341e86eff719008e2b6dcf6f7ec9f4ecd3c1fad2cApprove1179947232024-03-28 1:10:231 day 13 hrs ago0xebe27a2f1dc18a233a845ebb506c4d34324e783c IN  Perpetual Protocol: PERP Token0 ETH0.0000020819790.029313255
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OVERVIEW

On-chain derivative DEX with liquidity provisioning and up to 10x leverage for makers and takers.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xd2ada8694f66ededd611097d231a6c5a6d5c4286b9f3600a87be48ce1552e1221075566262023-07-30 10:13:49243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0xd2ada8694f66ededd611097d231a6c5a6d5c4286b9f3600a87be48ce1552e1221075566262023-07-30 10:13:49243 days 4 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 Perpetual Protocol: PERP Token0 ETH
0xd2ada8694f66ededd611097d231a6c5a6d5c4286b9f3600a87be48ce1552e1221075566262023-07-30 10:13:49243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0xd2ada8694f66ededd611097d231a6c5a6d5c4286b9f3600a87be48ce1552e1221075566262023-07-30 10:13:49243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x850b628b2d01df4c2d71b73ef6e1f8aa9225b9d5703cf40f727660f56f59795e1075566192023-07-30 10:13:35243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0xba07469023ecb4418767102e88670254a9164a9481f4ddad1fe993d33aff7f0e1075564212023-07-30 10:06:59243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0xba07469023ecb4418767102e88670254a9164a9481f4ddad1fe993d33aff7f0e1075564212023-07-30 10:06:59243 days 4 hrs ago 0xc160e4fe967f8ada7b58d9c578267ebbec1e7a63 Perpetual Protocol: PERP Token0 ETH
0xba07469023ecb4418767102e88670254a9164a9481f4ddad1fe993d33aff7f0e1075564212023-07-30 10:06:59243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0xba07469023ecb4418767102e88670254a9164a9481f4ddad1fe993d33aff7f0e1075564212023-07-30 10:06:59243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x51f150a0f250809d7c46f8334a92165bea89807a Perpetual Protocol: PERP Token0 ETH
0x479f1ecf2db109806a647a2a983cc967d1efc259205fcc24d671709b335eed1d1075564132023-07-30 10:06:43243 days 4 hrs ago 0x535541f1aa08416e69dc4d610131099fa2ae7222 Perpetual Protocol: PERP Token0 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x7c6b91d9be155a6db01f749217d76ff02a7227f2
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
L2StandardERC20

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2021-11-28
*/

// File @openzeppelin/contracts/token/ERC20/[email protected]

// SPDX-License-Identifier: MIT

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 @openzeppelin/contracts/token/ERC20/extensions/[email protected]

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/utils/[email protected]

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/[email protected]

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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * 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}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * 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 value {ERC20} uses, unless this function is
     * 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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - 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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, 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;
        _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;
        }
        _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 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 @openzeppelin/contracts/utils/introspection/[email protected]

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 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 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");
        _;
    }

    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;
    }

    function mint(address _to, uint256 _amount) public virtual onlyL2Bridge {
        _mint(_to, _amount);

        emit Mint(_to, _amount);
    }

    function burn(address _from, uint256 _amount) public virtual onlyL2Bridge {
        _burn(_from, _amount);

        emit Burn(_from, _amount);
    }
}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Swarm Source

ipfs://cf6f2a647337a3023928b1f0a8286454f8c5755dd6ed9bb72c21a4693b3d555b
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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