Token Dola USD Stablecoin

 

Overview [ERC-20]

Price
$0.99 @ 0.000343 Eth (-0.46%)
Fully Diluted Market Cap
Max Total Supply:
55,776,798.631193084915228745 DOLA

Holders:
2,573 ( 0.155%)

Transfers:
-

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OVERVIEW

DOLA is a decentralized USD stablecoin governed by Inverse Finance DAO.

Market

Volume (24H):$23,255,830.00
Market Capitalization:$77,094,942.00
Circulating Supply:77,581,829.00 DOLA
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X085780639CC2CACD35E474E71F4D000E2405D8F6$0.9944
0.0003456 Eth
$9,325,108.0000
9,449,458.436 0X865377367054516E17014CCDED1E7D814EDC9CE4
40.2833%
2
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X3175DF0976DFA876431C2E9EE6BC45B65D3473CC$0.9930
0.0003451 Eth
$5,873,512.0000
5,891,401.927 0X865377367054516E17014CCDED1E7D814EDC9CE4
25.1152%
3
Balancer V2
0X865377367054516E17014CCDED1E7D814EDC9CE4-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$0.9992
0.0003451 Eth
$4,629,496.0000
4,630,884.682 0X865377367054516E17014CCDED1E7D814EDC9CE4
19.7416%
4
Aerodrome (Base)
0X4621B7A9C75199271F773EBD9A499DBD165C3191-0X833589FCD6EDB6E08F4C7C32D4F71B54BDA02913$0.9944
0.0003453 Eth
$1,364,409.0000
1,366,641.991 0X4621B7A9C75199271F773EBD9A499DBD165C3191
5.8260%
5
Aerodrome (Base)
0X4621B7A9C75199271F773EBD9A499DBD165C3191-0XB79DD08EA68A908A97220C76D19A6AA9CBDE4376$0.9992
0.0003470 Eth
$1,148,449.0000
1,154,604.044 0X4621B7A9C75199271F773EBD9A499DBD165C3191
4.9221%
6
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0XF939E0A03FB07F59A73314E73794BE0E57AC1B4E$0.9936
0.0003453 Eth
$451,044.0000
453,782.525 0X865377367054516E17014CCDED1E7D814EDC9CE4
1.9345%
7
Aerodrome (Base)
0X4621B7A9C75199271F773EBD9A499DBD165C3191-0XD9AAEC86B65D86F6A7B5B1B0C42FFA531710B6CA$0.9995
0.0003471 Eth
$347,640.0000
348,101.993 0X4621B7A9C75199271F773EBD9A499DBD165C3191
1.4840%
8
Velodrome Finance v2
0X0B2C639C533813F4AA9D7837CAF62653D097FF85-0X8AE125E8653821E851F12A49F7765DB9A9CE7384$1.0030
0.0003466 Eth
$71,803.0000
71,739.380 0X0B2C639C533813F4AA9D7837CAF62653D097FF85
0.3058%
9
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68$1.0150
0.0003528 Eth
$40,628.0000
41,156.915 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.1755%
10
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X6C3F90F043A72FA612CBAC8115EE7E52BDE6E490$0.9997
0.0003452 Eth
$14,838.4800
16,797.867 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0716%
11
Uniswap V3 (Ethereum)
0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68-0X865377367054516E17014CCDED1E7D814EDC9CE4$0.9997
0.0003452 Eth
$12,409.2000
270.786 0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68
0.0012%
12
Velodrome Finance
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0X7F5C764CBC14F9669B88837CA1490CCA17C31607$0.9962
0.0003462 Eth
$6,364.1800
6,388.705 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0272%
13
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0XAD038EB671C44B853887A7E32528FAB35DC5D710$0.9936
0.0003453 Eth
$5,740.8800
5,816.537 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0248%
14
Aerodrome (Base)
0X4621B7A9C75199271F773EBD9A499DBD165C3191-0XBF1AEA8670D2528E08334083616DD9C5F3B087AE$0.9984
0.0003467 Eth
$5,317.0800
5,309.067 0X4621B7A9C75199271F773EBD9A499DBD165C3191
0.0226%
15
Velodrome Finance v2
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0X7F5C764CBC14F9669B88837CA1490CCA17C31607$1.0000
0.0003453 Eth
$5,118.1900
5,118.680 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0218%
16
Uniswap V2 (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$1.0010
0.0003459 Eth
$4,089.8000
4,004.817 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0171%
17
Balancer V2
0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68-0X865377367054516E17014CCDED1E7D814EDC9CE4$0.9985
0.0003436 Eth
$2,801.0400
58.800 0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68
0.0003%
18
Ramses
0X6A7661795C374C0BFC635934EFADDFF3A7EE23B6-0X17FC002B466EEC40DAE837FC4BE5C67993DDBD6F$0.9926
0.0003428 Eth
$2,705.9400
2,725.166 0X6A7661795C374C0BFC635934EFADDFF3A7EE23B6
0.0116%
19
Velodrome Finance v2
0X2E3D870790DC77A83DD1D18184ACC7439A53F475-0X8AE125E8653821E851F12A49F7765DB9A9CE7384$1.0030
0.0003466 Eth
$2,312.8500
2,320.002 0X2E3D870790DC77A83DD1D18184ACC7439A53F475
0.0099%
20
Uniswap V3 (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$0.9985
0.0003436 Eth
$513.7400
514.504 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0022%
21
Velodrome Finance v2
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0XDFA46478F9E5EA86D57387849598DBFB2E964B02$1.0030
0.0003466 Eth
$164.1600
162.172 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0007%
22
Sushiswap
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X41D5D79431A913C4AE7D69A668ECDFE5FF9DFB68$0.9397
0.0003266 Eth
$163.3000
173.777 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0007%
23
Velodrome Finance v2
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0XCB8FA9A76B8E203D8C3797BF438D8FB81EA3326A$1.0040
0.0003453 Eth
$69.0200
68.983 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0003%
24
Curve (Ethereum)
0X865377367054516E17014CCDED1E7D814EDC9CE4-0X6C3F90F043A72FA612CBAC8115EE7E52BDE6E490$0.9887
0.0003266 Eth
$43.4000
43.890 0X865377367054516E17014CCDED1E7D814EDC9CE4
0.0002%
25
Velodrome Finance
0X73CB180BF0521828D8849BC8CF2B920918E23032-0X8AE125E8653821E851F12A49F7765DB9A9CE7384$0.9962
0.0003462 Eth
$30.0900
30.238 0X73CB180BF0521828D8849BC8CF2B920918E23032
0.0001%
26
Velodrome Finance v2
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0XC5B001DC33727F8F26880B184090D3E252470D45$1.0010
0.0003455 Eth
$24.1100
24.116 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0001%
27
Aerodrome (Base)
0X4621B7A9C75199271F773EBD9A499DBD165C3191-0X85483696CC9970AD9EDD786B2C5EF735F38D156F$1.0040
0.0003300 Eth
$2.8000
2.794 0X4621B7A9C75199271F773EBD9A499DBD165C3191
0.0000%
28
Velodrome Finance v2
0X73CB180BF0521828D8849BC8CF2B920918E23032-0X8AE125E8653821E851F12A49F7765DB9A9CE7384$1.0030
0.0003279 Eth
$1.2700
1.273 0X73CB180BF0521828D8849BC8CF2B920918E23032
0.0000%
29
Velodrome Finance
0X8AE125E8653821E851F12A49F7765DB9A9CE7384-0X7F5C764CBC14F9669B88837CA1490CCA17C31607$1.0010
0.0003262 Eth
$1.1300
1.135 0X8AE125E8653821E851F12A49F7765DB9A9CE7384
0.0000%

Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x50c5725949a6f0c72e6c4a641f24049a917db0cb
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
OptimismMintableERC20

Compiler Version
v0.8.15+commit.e14f2714

Optimization Enabled:
Yes with 999999 runs

Other Settings:
london EvmVersion
File 1 of 9 : OptimismMintableERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import { ILegacyMintableERC20, IOptimismMintableERC20 } from "./IOptimismMintableERC20.sol";
import { Semver } from "../universal/Semver.sol";

/**
 * @title OptimismMintableERC20
 * @notice OptimismMintableERC20 is a standard extension of the base ERC20 token contract designed
 *         to allow the StandardBridge contracts to mint and burn tokens. This makes it possible to
 *         use an OptimismMintablERC20 as the L2 representation of an L1 token, or vice-versa.
 *         Designed to be backwards compatible with the older StandardL2ERC20 token which was only
 *         meant for use on L2.
 */
contract OptimismMintableERC20 is IOptimismMintableERC20, ILegacyMintableERC20, ERC20, Semver {
    /**
     * @notice Address of the corresponding version of this token on the remote chain.
     */
    address public immutable REMOTE_TOKEN;

    /**
     * @notice Address of the StandardBridge on this network.
     */
    address public immutable BRIDGE;

    /**
     * @notice Emitted whenever tokens are minted for an account.
     *
     * @param account Address of the account tokens are being minted for.
     * @param amount  Amount of tokens minted.
     */
    event Mint(address indexed account, uint256 amount);

    /**
     * @notice Emitted whenever tokens are burned from an account.
     *
     * @param account Address of the account tokens are being burned from.
     * @param amount  Amount of tokens burned.
     */
    event Burn(address indexed account, uint256 amount);

    /**
     * @notice A modifier that only allows the bridge to call
     */
    modifier onlyBridge() {
        require(msg.sender == BRIDGE, "OptimismMintableERC20: only bridge can mint and burn");
        _;
    }

    /**
     * @custom:semver 1.0.0
     *
     * @param _bridge      Address of the L2 standard bridge.
     * @param _remoteToken Address of the corresponding L1 token.
     * @param _name        ERC20 name.
     * @param _symbol      ERC20 symbol.
     */
    constructor(
        address _bridge,
        address _remoteToken,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol) Semver(1, 0, 0) {
        REMOTE_TOKEN = _remoteToken;
        BRIDGE = _bridge;
    }

    /**
     * @notice Allows the StandardBridge on this network to mint tokens.
     *
     * @param _to     Address to mint tokens to.
     * @param _amount Amount of tokens to mint.
     */
    function mint(address _to, uint256 _amount)
        external
        virtual
        override(IOptimismMintableERC20, ILegacyMintableERC20)
        onlyBridge
    {
        _mint(_to, _amount);
        emit Mint(_to, _amount);
    }

    /**
     * @notice Allows the StandardBridge on this network to burn tokens.
     *
     * @param _from   Address to burn tokens from.
     * @param _amount Amount of tokens to burn.
     */
    function burn(address _from, uint256 _amount)
        external
        virtual
        override(IOptimismMintableERC20, ILegacyMintableERC20)
        onlyBridge
    {
        _burn(_from, _amount);
        emit Burn(_from, _amount);
    }

    /**
     * @notice ERC165 interface check function.
     *
     * @param _interfaceId Interface ID to check.
     *
     * @return Whether or not the interface is supported by this contract.
     */
    function supportsInterface(bytes4 _interfaceId) external pure returns (bool) {
        bytes4 iface1 = type(IERC165).interfaceId;
        // Interface corresponding to the legacy L2StandardERC20.
        bytes4 iface2 = type(ILegacyMintableERC20).interfaceId;
        // Interface corresponding to the updated OptimismMintableERC20 (this contract).
        bytes4 iface3 = type(IOptimismMintableERC20).interfaceId;
        return _interfaceId == iface1 || _interfaceId == iface2 || _interfaceId == iface3;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for the remote token. Use REMOTE_TOKEN going forward.
     */
    function l1Token() public view returns (address) {
        return REMOTE_TOKEN;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for the bridge. Use BRIDGE going forward.
     */
    function l2Bridge() public view returns (address) {
        return BRIDGE;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for REMOTE_TOKEN.
     */
    function remoteToken() public view returns (address) {
        return REMOTE_TOKEN;
    }

    /**
     * @custom:legacy
     * @notice Legacy getter for BRIDGE.
     */
    function bridge() public view returns (address) {
        return BRIDGE;
    }
}

File 2 of 9 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

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:
     *
     * - `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;
        }
        _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;
        _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 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 3 of 9 : IERC165.sol
// SPDX-License-Identifier: MIT
// 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 4 of 9 : IOptimismMintableERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

/**
 * @title IOptimismMintableERC20
 * @notice This interface is available on the OptimismMintableERC20 contract. We declare it as a
 *         separate interface so that it can be used in custom implementations of
 *         OptimismMintableERC20.
 */
interface IOptimismMintableERC20 is IERC165 {
    function remoteToken() external returns (address);

    function bridge() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;
}

/**
 * @custom:legacy
 * @title ILegacyMintableERC20
 * @notice This interface was available on the legacy L2StandardERC20 contract. It remains available
 *         on the OptimismMintableERC20 contract for backwards compatibility.
 */
interface ILegacyMintableERC20 is IERC165 {
    function l1Token() external returns (address);

    function mint(address _to, uint256 _amount) external;

    function burn(address _from, uint256 _amount) external;
}

File 5 of 9 : Semver.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";

/**
 * @title Semver
 * @notice Semver is a simple contract for managing contract versions.
 */
contract Semver {
    /**
     * @notice Contract version number (major).
     */
    uint256 private immutable MAJOR_VERSION;

    /**
     * @notice Contract version number (minor).
     */
    uint256 private immutable MINOR_VERSION;

    /**
     * @notice Contract version number (patch).
     */
    uint256 private immutable PATCH_VERSION;

    /**
     * @param _major Version number (major).
     * @param _minor Version number (minor).
     * @param _patch Version number (patch).
     */
    constructor(
        uint256 _major,
        uint256 _minor,
        uint256 _patch
    ) {
        MAJOR_VERSION = _major;
        MINOR_VERSION = _minor;
        PATCH_VERSION = _patch;
    }

    /**
     * @notice Returns the full semver contract version.
     *
     * @return Semver contract version as a string.
     */
    function version() public view returns (string memory) {
        return
            string(
                abi.encodePacked(
                    Strings.toString(MAJOR_VERSION),
                    ".",
                    Strings.toString(MINOR_VERSION),
                    ".",
                    Strings.toString(PATCH_VERSION)
                )
            );
    }
}

File 6 of 9 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 7 of 9 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

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 8 of 9 : 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 9 of 9 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

Settings
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    "@rari-capital/=node_modules/@rari-capital/",
    "@rari-capital/solmate/=node_modules/@rari-capital/solmate/",
    "ds-test/=node_modules/ds-test/src/",
    "forge-std/=node_modules/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
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      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

Contract Security Audit

Contract ABI

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":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]

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