Contract 0x1a3acf6d19267e2d3e7f898f42803e90c9219062

 
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x81f440b9d3acc55e2f632df77809732aaa352e44f23a46a0c9ad89418badb99eApprove240885932022-01-24 2:39:015 hrs 12 mins ago0x4423ac71f53ca92e2f2be5917a9c2468e7412f4a IN  Frax Finance: FXS Token0 MATIC0.008104650464 174.020365119
0x89d8e1f54328e6e40897d3851fa76b13469c7052c2a9edec3a5fc3df29aaa3e4Transfer240884602022-01-24 2:34:275 hrs 17 mins ago0xd6fc210686d22d0f2e9303700a9e44bc6527b105 IN  Frax Finance: FXS Token0 MATIC0.002416055784 46.610509979
0x53f1fb599faffa3f1a4218db98dc888a7485566781437c5d80a905b65980cf3fExchange Canonic...240716892022-01-23 16:39:2815 hrs 12 mins ago0x5d4614b4e5e21d7344b369e09b9be2bb8241a307 IN  Frax Finance: FXS Token0 MATIC0.010478236808 118.833206414
0xbb5af4bece8b066f33aeb77dfe664310452e6e93dfcbebb045d9aeafddc3132fExchange Old For...240716562022-01-23 16:38:1815 hrs 13 mins ago0x5d4614b4e5e21d7344b369e09b9be2bb8241a307 IN  Frax Finance: FXS Token0 MATIC0.01232473245 118.703359886
0x3461d19ed1c30cd9c2320547b63f02d6e9c8f6871f68b48e1422672f52706ea5Approve240648432022-01-23 12:04:5319 hrs 46 mins ago0x827eb4260508f8ce4d97847c7cfa13f6521f0e06 IN  Frax Finance: FXS Token0 MATIC0.004093999182 87.904991777
0xd1ef74eee1127fd432b0bab783c5e86b6123b56bd05d2a5df9f907dfd7f0902fApprove240620672022-01-23 10:20:2321 hrs 31 mins ago0xb481465614689230cd0863f8d9a9ac9439dfe79a IN  Frax Finance: FXS Token0 MATIC0.003925424053 84.285402568
0x5a17f3367f43c552b2efccf8b0421ac9fe3afdad9baf3b9c5e8a3981c2c572a8Exchange Old For...240620362022-01-23 10:18:1921 hrs 33 mins ago0xb481465614689230cd0863f8d9a9ac9439dfe79a IN  Frax Finance: FXS Token0 MATIC0.005521216219 63.661288385
0x7b4dfcdf7caf7711e8d3a75684368d739fad93ef696ac10ef204080f037c00f0Exchange Old For...240369892022-01-22 19:23:281 day 12 hrs ago0xcfcca7aea9e403744858c53e13adf8975db9038b IN  Frax Finance: FXS Token0 MATIC0.015340391057 333.995015406
0x82a476f37d9fd72058832aad1e0ce31ee1b85ab6a5476473b380330fbccbb9b2Exchange Old For...240369242022-01-22 19:21:081 day 12 hrs ago0xcfcca7aea9e403744858c53e13adf8975db9038b IN  Frax Finance: FXS Token0 MATIC0.05495621847 529.300559298
0x872fd3f7272dc4e99a29176d8ab78e8c4631679ea29e204cadf4b8b731ae4ebfTransfer240250322022-01-22 12:14:221 day 19 hrs ago0xe7e0e94c62dc0efc45ce8858b2fa5207b4d8a06e IN  Frax Finance: FXS Token0 MATIC0.00830162187 176.363830607
0x94232f53c2d3f5439cebd8f1834da7a305bf4acca8b562e4088a3d190039db11Transfer240250122022-01-22 12:13:341 day 19 hrs ago0xe7e0e94c62dc0efc45ce8858b2fa5207b4d8a06e IN  Frax Finance: FXS Token0 MATIC0.008070475746 183.31158286
0x0b04c0e88ad295a5ee80ad8089bd110e1486b497390ec56bdc58d5a622ef3245Exchange Old For...240222362022-01-22 10:30:021 day 21 hrs ago0xf29bc8c205f8b40691278722e54a14d904180766 IN  Frax Finance: FXS Token0 MATIC0.110849027066 1,067.745117002
0x6a930753fda492c3d7d4d24d40ae135f15df2e03db241c6b6a0dcde84a70f6b1Approve240204492022-01-22 9:22:081 day 22 hrs ago0x6d910dca36a49b348f387ab0975e9ccd1ea7d843 IN  Frax Finance: FXS Token0 MATIC0.006473647139
0xb3de8948cd5ca6f12e5c538e46b0e81d4e62ec3e007b07b95a9a21f768222178Exchange Canonic...240192082022-01-22 8:35:321 day 23 hrs ago0x6d910dca36a49b348f387ab0975e9ccd1ea7d843 IN  Frax Finance: FXS Token0 MATIC0.015632447008 203.53158618
0x81c9a351f1faeff7b6309d722c1d4e3256bcf15232f5c849767c5fc15e8f1b74Approve240187342022-01-22 8:18:541 day 23 hrs ago0xc45d45b54045074ed12d1fe127f714f8ace46f8c IN  Frax Finance: FXS Token0 MATIC0.011368049466 244.090985471
0x8e1b51161deb6de2d0431760f275316dbcdd7c87daf9f9b465139df054bc5bc0Exchange Canonic...240176402022-01-22 7:41:162 days 10 mins ago0x6d910dca36a49b348f387ab0975e9ccd1ea7d843 IN  Frax Finance: FXS Token0 MATIC0.131570310469 1,401.085239169
0xf3184c84fbe8a9cd10c0d13d47ad9dcf3bfe3d7132090364dffb31c1cdbf70a9Approve240148542022-01-22 5:56:572 days 1 hr ago0xe49c043ff0c6393bd9c192b11a3f4898d4e302ad IN  Frax Finance: FXS Token0 MATIC0.050621147243 1,086.92047417
0x8c22cfc9902f97a0017d4cfb13de83abeb69fc386b29a41d3a469ffe0de7bd20Exchange Old For...240122772022-01-22 4:23:592 days 3 hrs ago0xf2603761eb165cc8f955aebb8e44f6eb3ea2e168 IN  Frax Finance: FXS Token0 MATIC0.004364240192 44.070769807
0x13a570635a4ff381829f9440b0cce96b7fa1f4de5eed1f90e63f0dab63baab2aTransfer240120652022-01-22 4:16:432 days 3 hrs ago0xf2603761eb165cc8f955aebb8e44f6eb3ea2e168 IN  Frax Finance: FXS Token0 MATIC0.005688327589120.907339253
0xc4e3fbf67492acc220106a1edee785ae1ec3e9f23a8261ba409b16f727085deeExchange Old For...240120272022-01-22 4:15:232 days 3 hrs ago0xf2603761eb165cc8f955aebb8e44f6eb3ea2e168 IN  Frax Finance: FXS Token0 MATIC0.005550708481 56.051909378
0xe9598d9c6691c6c1b9bbcabc02cadb778d076bd84389c6da5a7a9d50a6a03180Approve240076632022-01-22 1:40:372 days 6 hrs ago0xc3e1fe5a748313c4118efbb08bdca23f19f382e3 IN  Frax Finance: FXS Token0 MATIC0.004603691093 98.848927342
0xa3f5cdf05abf3d2e06a2f33c919a36ee327d80e3f4bc7c9e4bca6cd15da4d1aaApprove240034262022-01-21 23:14:512 days 8 hrs ago0x1eac72aad0566d209ce60028fac10b634d23519d IN  Frax Finance: FXS Token0 MATIC0.065295806863 1,402.009895512
0x598ea82fa957daf7a6b0fedbde6a13016cf37a425147955c6b201924cd9b5069Exchange Old For...240032542022-01-21 23:08:552 days 8 hrs ago0x31fce7fd6931f7b5a6a756a219496f1eb0fdc54e IN  Frax Finance: FXS Token0 MATIC0.063123617515 637.43201433
0xcb9cc24e934f674b08f23bcbb0271d803ecc5d0395b08522133fe87310a6cd9fExchange Old For...240030742022-01-21 23:02:472 days 8 hrs ago0x31fce7fd6931f7b5a6a756a219496f1eb0fdc54e IN  Frax Finance: FXS Token0 MATIC0.130377462645 1,316.571703415
0x0817040464faf76a0a5c26b51e8242a591b72cf632ef34b15fe027ed10702723Approve240023852022-01-21 22:38:542 days 9 hrs ago0xca7c7a4497c506dd498944b13234ead90c55bab0 IN  Frax Finance: FXS Token0 MATIC0.022784967456 489.231259678
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OVERVIEW

FXS is the value accrual and governance token of the entire Frax ecosystem. Frax is a fractional-algorithmic stablecoin protocol. It aims to provide highly scalable, decentralized, algorithmic money in place of fixed-supply assets like BTC.

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Contract Source Code Verified (Exact Match)

Contract Name:
CrossChainCanonicalFXS

Compiler Version
v0.8.6+commit.11564f7e

Optimization Enabled:
Yes with 100000 runs

Other Settings:
default evmVersion, GNU GPLv2 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-09-21
*/

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// Sources flattened with hardhat v2.6.2 https://hardhat.org

// File contracts/Common/Context.sol


/*
 * @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 GSN 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 payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


// File contracts/Math/SafeMath.sol


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


// File contracts/ERC20/IERC20.sol



/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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 contracts/Utils/Address.sol


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

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts/ERC20/ERC20.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 {ERC20Mintable}.
 *
 * 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 guidelines: functions revert instead
 * of 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 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory __name, string memory __symbol) public {
        _name = __name;
        _symbol = __symbol;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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.approve(address spender, uint256 amount)
     */
    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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(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
     *
     * - `to` 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for `accounts`'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(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);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is 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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal virtual {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }

    /**
     * @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 to 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:using-hooks.adoc[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


// File contracts/ERC20/ERC20Permit/IERC20Permit.sol



/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}


// File contracts/ERC20/ERC20Permit/ECDSA.sol



/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}


// File contracts/ERC20/ERC20Permit/EIP712.sol



/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}


// File contracts/ERC20/ERC20Permit/Counters.sol



/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}


// File contracts/ERC20/ERC20Permit/ERC20Permit.sol







/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    constructor(string memory name) EIP712(name, "1") {}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    function PERMIT_TYPEHASH() external view returns (bytes32) {
        return _PERMIT_TYPEHASH;
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}


// File contracts/Uniswap/TransferHelper.sol


// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}


// File contracts/Staking/Owned.sol


// https://docs.synthetix.io/contracts/Owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor (address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        require(msg.sender == owner, "Only the contract owner may perform this action");
        _;
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// File contracts/Utils/ReentrancyGuard.sol


/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


// File contracts/ERC20/__CROSSCHAIN/CrossChainCanonical.sol


// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================== CrossChainCanonical =======================
// ====================================================================
// Cross-chain / non mainnet canonical token contract.
// Can accept any number of old non-canonical tokens. These will be 
// withdrawable by the owner so they can de-bridge it and get back mainnet 'real' tokens
// Does not include any spurious mainnet logic

// Frax Finance: https://github.com/FraxFinance

// Primary Author(s)
// Travis Moore: https://github.com/FortisFortuna

// Reviewer(s) / Contributor(s)
// Jason Huan: https://github.com/jasonhuan
// Sam Kazemian: https://github.com/samkazemian
// Dennis: github.com/denett





contract CrossChainCanonical is ERC20Permit, Owned, ReentrancyGuard {
    using SafeMath for uint256;

    /* ========== STATE VARIABLES ========== */

    // Core
    address public timelock_address; // Governance timelock address
    address public custodian_address; 

    // Misc
    uint256 public mint_cap;
    mapping(address => uint256[2]) public swap_fees;
    mapping(address => bool) public fee_exempt_list;

    // Acceptable old tokens
    address[] public bridge_tokens_array;
    mapping(address => bool) public bridge_tokens;

    // The addresses in this array are able to mint tokens
    address[] public minters_array;
    mapping(address => bool) public minters; // Mapping is also used for faster verification

    // Constants for various precisions
    uint256 private constant PRICE_PRECISION = 1e6;

    // Administrative booleans
    bool public exchangesPaused; // Pause old token exchanges in case of an emergency
    mapping(address => bool) public canSwap;

    /* ========== MODIFIERS ========== */

    modifier onlyByOwnGov() {
        require(msg.sender == timelock_address || msg.sender == owner, "Not owner or timelock");
        _;
    }

    modifier onlyByOwnGovCust() {
        require(msg.sender == timelock_address || msg.sender == owner || msg.sender == custodian_address, "Not owner, tlck, or custd");
        _;
    }

    modifier onlyMinters() {
       require(minters[msg.sender], "Not a minter");
        _;
    } 

    modifier onlyMintersOwnGov() {
       require(_isMinterOwnGov(msg.sender), "Not minter, owner, or tlck");
        _;
    } 

    modifier validBridgeToken(address token_address) {
       require(bridge_tokens[token_address], "Invalid old token");
        _;
    } 

    /* ========== CONSTRUCTOR ========== */

    constructor (
        string memory _name,
        string memory _symbol,
        address _creator_address,
        uint256 _initial_mint_amt,
        address _custodian_address,
        address[] memory _bridge_tokens
    ) ERC20(_name, _symbol) ERC20Permit(_name) Owned(_creator_address) {
        custodian_address = _custodian_address;

        // Initialize the starting old tokens
        for (uint256 i = 0; i < _bridge_tokens.length; i++){ 
            // Mark as accepted
            bridge_tokens[_bridge_tokens[i]] = true;

            // Add to the array
            bridge_tokens_array.push(_bridge_tokens[i]);

            // Set a small swap fee initially of 0.04%
            swap_fees[_bridge_tokens[i]] = [400, 400];

            // Make sure swapping is on
            canSwap[_bridge_tokens[i]] = true;
        }

        // Set the mint cap to the initial mint amount
        mint_cap = _initial_mint_amt;

        // Mint some canonical tokens to the creator
        super._mint(_creator_address, _initial_mint_amt);


    }

    /* ========== VIEWS ========== */

    // Helpful for UIs
    function allBridgeTokens() external view returns (address[] memory) {
        return bridge_tokens_array;
    }

    function _isMinterOwnGov(address the_address) internal view returns (bool) {
        return (the_address == timelock_address || the_address == owner || minters[the_address]);
    }

    function _isFeeExempt(address the_address) internal view returns (bool) {
        return (_isMinterOwnGov(the_address) || fee_exempt_list[the_address]);
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    // Enforce a minting cap
    function _mint_capped(address account, uint256 amount) internal {
        require(totalSupply() + amount <= mint_cap, "Mint cap");
        super._mint(account, amount);
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // Exchange old tokens for these canonical tokens
    function exchangeOldForCanonical(address bridge_token_address, uint256 token_amount) external nonReentrant validBridgeToken(bridge_token_address) returns (uint256 canonical_tokens_out) {
        require(!exchangesPaused && canSwap[bridge_token_address], "Exchanges paused");

        // Pull in the old tokens
        TransferHelper.safeTransferFrom(bridge_token_address, msg.sender, address(this), token_amount);

        // Handle the fee, if applicable
        canonical_tokens_out = token_amount;
        if (!_isFeeExempt(msg.sender)) {
            canonical_tokens_out -= ((canonical_tokens_out * swap_fees[bridge_token_address][0]) / PRICE_PRECISION);
        }

        // Mint canonical tokens and give it to the sender
        _mint_capped(msg.sender, canonical_tokens_out);
    }

    // Exchange canonical tokens for old tokens
    function exchangeCanonicalForOld(address bridge_token_address, uint256 token_amount) external nonReentrant validBridgeToken(bridge_token_address) returns (uint256 bridge_tokens_out) {
        require(!exchangesPaused && canSwap[bridge_token_address], "Exchanges paused");
        
        // Burn the canonical tokens
        super._burn(msg.sender, token_amount);

        // Handle the fee, if applicable
        bridge_tokens_out = token_amount;
        if (!_isFeeExempt(msg.sender)) {
            bridge_tokens_out -= ((bridge_tokens_out * swap_fees[bridge_token_address][1]) / PRICE_PRECISION);
        }

        // Give old tokens to the sender
        TransferHelper.safeTransfer(bridge_token_address, msg.sender, bridge_tokens_out);
    }

    /* ========== MINTERS OR GOVERNANCE FUNCTIONS ========== */

    // Collect old tokens so you can de-bridge them back on mainnet
    function withdrawBridgeTokens(address bridge_token_address, uint256 bridge_token_amount) external onlyMintersOwnGov validBridgeToken(bridge_token_address) {
        TransferHelper.safeTransfer(bridge_token_address, msg.sender, bridge_token_amount);
    }

    /* ========== MINTERS ONLY ========== */

    // This function is what other minters will call to mint new tokens 
    function minter_mint(address m_address, uint256 m_amount) external onlyMinters {
        _mint_capped(m_address, m_amount);
        emit TokenMinted(msg.sender, m_address, m_amount);
    }

    // This function is what other minters will call to burn tokens
    function minter_burn(uint256 amount) external onlyMinters {
        super._burn(msg.sender, amount);
        emit TokenBurned(msg.sender, amount);
    }

    /* ========== RESTRICTED FUNCTIONS, BUT CUSTODIAN CAN CALL TOO ========== */

    function toggleExchanges() external onlyByOwnGovCust {
        exchangesPaused = !exchangesPaused;
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function addBridgeToken(address bridge_token_address) external onlyByOwnGov {
        // Make sure the token is not already present
        for (uint i = 0; i < bridge_tokens_array.length; i++){ 
            if (bridge_tokens_array[i] == bridge_token_address){
                revert("Token already present");
            }
        }

        // Add the old token
        bridge_tokens[bridge_token_address] = true;
        bridge_tokens_array.push(bridge_token_address);

        // Turn swapping on
        canSwap[bridge_token_address] = true;

        emit BridgeTokenAdded(bridge_token_address);
    }

    function toggleBridgeToken(address bridge_token_address) external onlyByOwnGov {
        bridge_tokens[bridge_token_address] = !bridge_tokens[bridge_token_address];

        // Toggle swapping
        canSwap[bridge_token_address] = !canSwap[bridge_token_address];

        emit BridgeTokenToggled(bridge_token_address, !bridge_tokens[bridge_token_address]);
    }

    // Adds a minter address
    function addMinter(address minter_address) external onlyByOwnGov {
        require(minter_address != address(0), "Zero address detected");

        require(minters[minter_address] == false, "Address already exists");
        minters[minter_address] = true; 
        minters_array.push(minter_address);

        emit MinterAdded(minter_address);
    }

    // Remove a minter 
    function removeMinter(address minter_address) external onlyByOwnGov {
        require(minter_address != address(0), "Zero address detected");
        require(minters[minter_address] == true, "Address nonexistant");
        
        // Delete from the mapping
        delete minters[minter_address];

        // 'Delete' from the array by setting the address to 0x0
        for (uint i = 0; i < minters_array.length; i++){ 
            if (minters_array[i] == minter_address) {
                minters_array[i] = address(0); // This will leave a null in the array and keep the indices the same
                break;
            }
        }

        emit MinterRemoved(minter_address);
    }

    function setMintCap(uint256 _mint_cap) external onlyByOwnGov {
        mint_cap = _mint_cap;

        emit MintCapSet(_mint_cap);
    }

    function setSwapFees(address bridge_token_address, uint256 _bridge_to_canonical, uint256 _canonical_to_old) external onlyByOwnGov {
        swap_fees[bridge_token_address] = [_bridge_to_canonical, _canonical_to_old];
    }

    function toggleFeesForAddress(address the_address) external onlyByOwnGov {
        fee_exempt_list[the_address] = !fee_exempt_list[the_address];
    }

    function setTimelock(address new_timelock) external onlyByOwnGov {
        require(new_timelock != address(0), "Zero address detected");
        timelock_address = new_timelock;

        emit TimelockSet(new_timelock);
    }

    function setCustodian(address _custodian_address) external onlyByOwnGov {
        require(_custodian_address != address(0), "Zero address detected");
        custodian_address = _custodian_address;

        emit CustodianSet(_custodian_address);
    }

    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyByOwnGov {
        TransferHelper.safeTransfer(address(tokenAddress), msg.sender, tokenAmount);
    }

    // Generic proxy
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external onlyByOwnGov returns (bool, bytes memory) {
        (bool success, bytes memory result) = _to.call{value:_value}(_data);
        return (success, result);
    }

    /* ========== EVENTS ========== */

    event TokenBurned(address indexed from, uint256 amount);
    event TokenMinted(address indexed from, address indexed to, uint256 amount);
    event BridgeTokenAdded(address indexed bridge_token_address);
    event BridgeTokenToggled(address indexed bridge_token_address, bool state);
    event CollateralRatioRefreshed(uint256 global_collateral_ratio);
    event MinterAdded(address pool_address);
    event MinterRemoved(address pool_address);
    event MintCapSet(uint256 new_mint_cap);
    event TimelockSet(address new_timelock);
    event CustodianSet(address custodian_address);
}


// File contracts/ERC20/__CROSSCHAIN/CrossChainCanonicalFXS.sol


contract CrossChainCanonicalFXS is CrossChainCanonical {
    constructor (
        string memory _name,
        string memory _symbol,
        address _creator_address,
        uint256 _initial_mint_amt,
        address _custodian_address,
        address[] memory _bridge_tokens
    ) 
    CrossChainCanonical(_name, _symbol, _creator_address, _initial_mint_amt, _custodian_address, _bridge_tokens)
    {}
}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _name (string): Frax Share
Arg [1] : _symbol (string): FXS
Arg [2] : _creator_address (address): 0xedcc5884c5a8a0d2a37ffdcea589807792ca0b4c
Arg [3] : _initial_mint_amt (uint256): 250000000000000000000000
Arg [4] : _custodian_address (address): 0x058b3fa36471cd10a73355fe84f7d4ed7ba4607e
Arg [5] : _bridge_tokens (address[]): 0x3e121107f6f22da4911079845a470757af4e1a1b

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [2] : 000000000000000000000000edcc5884c5a8a0d2a37ffdcea589807792ca0b4c
Arg [3] : 0000000000000000000000000000000000000000000034f086f3b33b68400000
Arg [4] : 000000000000000000000000058b3fa36471cd10a73355fe84f7d4ed7ba4607e
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [7] : 4672617820536861726500000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [9] : 4658530000000000000000000000000000000000000000000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [11] : 0000000000000000000000003e121107f6f22da4911079845a470757af4e1a1b


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://508d7388d7b94133e1850ed1eee1c01e38af937c158f9f04c47e8cd02ab2a08c
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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