Token UMA Voting Token v1

 

Overview [ERC-20]

Price
$2.11 @ 0.001258 Eth (+2.81%)
Fully Diluted Market Cap
Max Total Supply:
67.5252281 UMA

Holders:
3 (0.00%)

Transfers:
-

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Market

Volume (24H):$10,548,021.00
Market Capitalization:$146,733,921.00
Circulating Supply:69,301,494.00 UMA
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BtcTurk PRO
UMA-TRY$2.1300
0.0012684 Eth
$1,574,679.0000
738,700.160 UMA
13.7751%
2
CoinDCX
UMA-USDT$2.1100
0.0012579 Eth
$1,287,199.0000
608,698.049 UMA
11.3508%
3
Binance
UMA-USDT$2.1100
0.0012578 Eth
$1,287,048.0000
608,571.016 UMA
11.3485%
4
LBank
UMA-USDT$2.1200
0.0012591 Eth
$856,470.0000
404,628.260 UMA
7.5454%
5
Huobi
UMA-USDT$2.1100
0.0012579 Eth
$611,895.0000
289,349.563 UMA
5.3957%
6
OKX
UMA-USDT$2.1200
0.0012592 Eth
$577,436.0000
272,798.114 UMA
5.0871%
7
Coinbase Exchange
UMA-USD$2.1100
0.0012531 Eth
$571,444.0000
271,340.845 UMA
5.0599%
8
DigiFinex
UMA-USDT$2.1100
0.0012574 Eth
$547,652.0000
259,140.331 UMA
4.8324%
9
Binance
UMA-TRY$2.1300
0.0012720 Eth
$421,581.0000
197,713.984 UMA
3.6869%
10
Bibox
UMA-ETH$2.1300
0.0012681 Eth
$397,059.0000
186,214.000 UMA
3.4725%
11
Deepcoin
UMA-USDT$2.1100
0.0012577 Eth
$344,343.0000
167,331.000 UMA
3.1203%
12
Paribu
UMA-TRY$2.1400
0.0012752 Eth
$310,421.0000
144,837.918 UMA
2.7009%
13
Binance
UMA-BUSD$2.1100
0.0012574 Eth
$239,778.0000
113,781.235 UMA
2.1218%
14
Bitrue
UMA-BUSD$2.1100
0.0012574 Eth
$220,436.0000
104,282.800 UMA
1.9446%
15
Phemex
UMA-USDT$2.1200
0.0012592 Eth
$199,179.0000
94,089.870 UMA
1.7546%
16
Dcoin
UMA-USDT$2.1100
0.0012567 Eth
$171,972.0000
81,385.000 UMA
1.5176%
17
Bitget
UMA-USDT$2.1100
0.0012579 Eth
$136,952.0000
64,767.973 UMA
1.2078%
18
BKEX
UMA-USDT$2.1100
0.0012579 Eth
$112,135.0000
53,067.369 UMA
0.9896%
19
Bilaxy
UMA-USDT$2.1100
0.0012565 Eth
$111,283.0000
52,670.000 UMA
0.9822%
20
Bithumb
UMA-KRW$2.1500
0.0012791 Eth
$93,386.0000
43,417.303 UMA
0.8096%
21
BingX
UMA-USDT$2.1100
0.0012572 Eth
$88,823.0000
42,033.009 UMA
0.7838%
22
MEXC Global
UMA-USDT$2.1100
0.0012555 Eth
$86,450.0000
40,958.700 UMA
0.7638%
23
BitMart
UMA-USDT$2.1100
0.0012571 Eth
$85,620.0000
40,508.025 UMA
0.7554%
24
BtcTurk PRO
UMA-USDT$2.1100
0.0012553 Eth
$83,388.0000
39,523.670 UMA
0.7370%
25
Binance
UMA-BTC$2.1200
0.0012589 Eth
$77,617.0000
36,667.452 UMA
0.6838%
26
CoinDCX
UMA-BTC$2.1200
0.0012590 Eth
$77,610.0000
36,667.452 UMA
0.6838%
27
Bibox
UMA-USDT$2.1200
0.0012630 Eth
$73,369.0000
34,550.000 UMA
0.6443%
28
Bitrue
UMA-USDT$2.1100
0.0012580 Eth
$69,263.0000
32,758.500 UMA
0.6109%
29
XT.COM
UMA-USDT$1.9300
0.0011517 Eth
$62,624.0000
32,465.070 UMA
0.6054%
30
Coinbase Exchange
UMA-GBP$2.1000
0.0012519 Eth
$53,292.0000
25,329.028 UMA
0.4723%
31
Coinbase Exchange
UMA-EUR$2.1100
0.0012547 Eth
$52,787.0000
25,034.213 UMA
0.4668%
32
KuCoin
UMA-USDT$2.1200
0.0012591 Eth
$51,496.0000
24,328.635 UMA
0.4537%
33
Bitvavo
UMA-EUR$2.1100
0.0012524 Eth
$49,971.0000
23,729.374 UMA
0.4425%
34
WhiteBIT
UMA-USDT$2.1100
0.0012564 Eth
$41,244.0000
19,531.744 UMA
0.3642%
35
LATOKEN
UMA-USDT$2.1200
0.0012585 Eth
$36,439.0000
17,223.484 UMA
0.3212%
36
Hotbit
UMA-BTC$2.1200
0.0012598 Eth
$35,030.0000
16,535.840 UMA
0.3084%
37
Gemini
UMA-USD$2.1000
0.0012499 Eth
$27,362.0000
13,019.138 UMA
0.2428%
38
MEXC Global
UMA-ETH$2.1300
0.0012641 Eth
$25,778.0000
12,129.550 UMA
0.2262%
39
ProBit Global
UMA-BTC$2.1200
0.0012592 Eth
$24,104.0000
11,389.850 UMA
0.2124%
40
Gate.io
UMA-USDT$2.1200
0.0012610 Eth
$23,155.0000
10,962.292 UMA
0.2044%
41
ProBit Global
UMA-USDT$2.1200
0.0012598 Eth
$21,122.0000
9,975.750 UMA
0.1860%
42
Pionex
UMA-USDT$2.1100
0.0012565 Eth
$20,664.0000
9,777.386 UMA
0.1823%
43
Sushiswap
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.1200
0.0012612 Eth
$18,985.5000
8,812.210 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.1643%
44
Hotbit
UMA-USDT$2.1200
0.0012590 Eth
$17,685.8300
8,354.160 UMA
0.1558%
45
CoinDCX
UMA-INR$2.2200
0.0013236 Eth
$13,811.3000
6,225.772 UMA
0.1161%
46
LATOKEN
UMA-BTC$2.1200
0.0012592 Eth
$9,745.7300
4,605.154 UMA
0.0859%
47
CoinEx
UMA-USDT$2.1000
0.0012507 Eth
$7,051.5100
3,343.415 UMA
0.0623%
48
Currency.com
UMA-USDT$2.1200
0.0012585 Eth
$5,189.7600
2,453.000 UMA
0.0457%
49
TokoCrypto
UMA-USDT$2.1100
0.0012574 Eth
$4,294.0800
2,036.216 UMA
0.0380%
50
Crypto.com Exchange
UMA-USDT$2.1100
0.0012526 Eth
$4,069.0000
1,932.800 UMA
0.0360%
51
Bybit
UMA-USDT$2.1000
0.0012469 Eth
$3,818.0300
1,821.057 UMA
0.0340%
52
Kraken
UMA-USD$2.1100
0.0012575 Eth
$3,808.5600
1,807.576 UMA
0.0337%
53
Coinbase Exchange
UMA-BTC$2.1300
0.0012678 Eth
$2,624.4900
1,231.785 UMA
0.0230%
54
Bitstamp
UMA-EUR$2.1100
0.0012562 Eth
$2,521.4800
1,197.621 UMA
0.0223%
55
WazirX
UMA-INR$2.1700
0.0012891 Eth
$2,518.7200
1,161.942 UMA
0.0217%
56
CoinEx
UMA-USDC$2.1300
0.0012642 Eth
$2,252.7100
1,064.021 UMA
0.0198%
57
Kraken
UMA-EUR$2.1000
0.0012520 Eth
$2,000.5900
950.742 UMA
0.0177%
58
Crypto.com Exchange
UMA-USD$2.1200
0.0012596 Eth
$1,779.1300
840.400 UMA
0.0157%
59
Nominex
UMA-USDT$2.1100
0.0012593 Eth
$1,069.3300
506.640 UMA
0.0094%
60
Tokenize
UMA-USD$2.1000
0.0012509 Eth
$856.1200
407.000 UMA
0.0076%
61
Uniswap (v2)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.1200
0.0012618 Eth
$669.3000
305.783 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0057%
62
Gate.io
UMA-TRY$2.1300
0.0012695 Eth
$644.5400
301.733 UMA
0.0056%
63
Zipmex
UMA-IDR$2.1000
0.0012479 Eth
$450.4200
214.702 UMA
0.0040%
64
Zipmex
UMA-USDT$2.1200
0.0012638 Eth
$429.1300
201.971 UMA
0.0038%
65
Nominex
UMA-TRY$2.1300
0.0012708 Eth
$372.8700
174.866 UMA
0.0033%
66
Nominex
UMA-BTC$2.1000
0.0012544 Eth
$356.4300
169.424 UMA
0.0032%
67
Coinone
UMA-KRW$2.4900
0.0014794 Eth
$293.6900
118.087 UMA
0.0022%
68
WazirX
UMA-USDT$2.1700
0.0012923 Eth
$277.9400
127.904 UMA
0.0024%
69
Currency.com
UMA-USD$2.1100
0.0012539 Eth
$252.9700
120.000 UMA
0.0022%
70
Tokenize
UMA-SGD$2.1100
0.0012541 Eth
$247.3500
117.292 UMA
0.0022%
71
Balancer (v1)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-DAI$2.1400
0.0013001 Eth
$220.9900
103.291 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0019%
72
Balancer (v1)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-USDC$1.9700
0.0012414 Eth
$207.8200
105.605 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0020%
73
DeFi Swap
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.0600
0.0012539 Eth
$200.7200
97.399 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0018%
74
Indodax
UMA-IDR$2.1400
0.0012731 Eth
$174.3200
81.443 UMA
0.0015%
75
Balancer (v1)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-ETH$1.9300
0.0012203 Eth
$139.3900
72.101 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0013%
76
Bittrex
UMA-USD$2.0100
0.0012223 Eth
$100.5000
50.000 UMA
0.0009%
77
Bitstamp
UMA-USD$1.9800
0.0012149 Eth
$67.3100
33.996 UMA
0.0006%
78
Huobi
UMA-BTC$2.1300
0.0012649 Eth
$54.7500
25.994 UMA
0.0005%
79
Bittrex
UMA-BTC$2.1200
0.0012599 Eth
$40.2100
18.984 UMA
0.0004%
80
Bittrex
UMA-ETH$1.9500
0.0012272 Eth
$30.6500
15.750 UMA
0.0003%
81
Balancer (v2)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-USDC$2.1700
0.0012912 Eth
$15.8700
7.311 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0001%
82
CEX.IO
UMA-USD$1.8300
0.0010884 Eth
$13.2800
7.257 UMA
0.0001%
83
Nominex
UMA-BUSD$2.1100
0.0012580 Eth
$10.0300
4.756 UMA
0.0001%
84
HitBTC
UMA-BTC$2.0200
0.0012766 Eth
$7.0400
3.480 UMA
0.0001%
85
Uniswap (v3)
0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.0400
0.0012908 Eth
$5.7500
2.820 0X04FA0D235C4ABF4BCF4787AF4CF447DE572EF828
0.0001%
86
Blockchain.com
UMA-USD$2.1200
0.0012595 Eth
$4.0700
1.921 UMA
0.0000%
87
Bittrex
UMA-USDT$1.9600
0.0012368 Eth
$3.9000
1.990 UMA
0.0000%
88
TokoCrypto
UMA-BTC$2.1200
0.0012928 Eth
$2.5500
1.205 UMA
0.0000%
89
HitBTC
UMA-USDT$2.1000
0.0012507 Eth
$1.8300
0.860 UMA
0.0000%
90
HitBTC
UMA-USDC$2.1400
0.0012711 Eth
$1.7500
0.820 UMA
0.0000%
91
Poloniex
UMA-USDT$2.0900
0.0012454 Eth
$1.7200
0.820 UMA
0.0000%

Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x023F34ce25758d4BC8FaC68e7472545D6b86d4Ea

Contract Name:
L2StandardERC20

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion
File 1 of 7 : L2StandardERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./IL2StandardERC20.sol";

contract L2StandardERC20 is IL2StandardERC20, ERC20 {
    address public l1Token;
    address public l2Bridge;
    uint8 private immutable _decimals;

    /**
     * @param _l2Bridge Address of the L2 standard bridge.
     * @param _l1Token Address of the corresponding L1 token.
     * @param _name ERC20 name.
     * @param _symbol ERC20 symbol.
     * @param decimals_ ERC20 decimals.
     */
    constructor(
        address _l2Bridge,
        address _l1Token,
        string memory _name,
        string memory _symbol,
        uint8 decimals_
    ) ERC20(_name, _symbol) {
        l1Token = _l1Token;
        l2Bridge = _l2Bridge;
        _decimals = decimals_;
    }

    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);
    }

    function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }
}

File 2 of 7 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @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 3 of 7 : IL2StandardERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

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 4 of 7 : IERC20.sol
// 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 5 of 7 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @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 6 of 7 : Context.sol
// SPDX-License-Identifier: MIT

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 : IERC165.sol
// SPDX-License-Identifier: MIT

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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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