Contract 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e80

 
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0x701ea1ddf85ccec85fc684333969433ce4fa2647fd8979c169fb1ee1b0f39d53Set Gov284486572022-10-05 6:36:0166 days 3 hrs agoMycelium: Deployer IN  0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH0.00000681
0xcc376991b60127022232b4ea7061d051336f1ed1d59989ee0519bf1e82e3e2d4Add Vault202099332022-08-14 7:38:37118 days 2 hrs agoMycelium: Deployer IN  0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH0.000048595234 ETH
0x828bd8338ce7245b57f9a8056eadaa8d56cd1132063c3aa6cc13ea460101ce6c0x60806040202098812022-08-14 7:38:35118 days 2 hrs agoMycelium: Deployer IN  Create: USDG0 ETH0.003034956465 ETH
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0x9d7d7efd08eb5517a9180fb64c3a63d6647e7a780819d7d8b0930b50a0992043450435772022-12-10 9:45:0444 secs ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x9d7d7efd08eb5517a9180fb64c3a63d6647e7a780819d7d8b0930b50a0992043450435772022-12-10 9:45:0444 secs ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x49fc2940cb0f3c6dcda05741240160d61fcce0350260ef1840049289ed3c4508450434132022-12-10 9:44:131 min ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x49fc2940cb0f3c6dcda05741240160d61fcce0350260ef1840049289ed3c4508450434132022-12-10 9:44:131 min ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x184287db12aa3e4a499e548f5ec36f3260d2cda7053185f8c0afdf482fc8962b450433922022-12-10 9:44:061 min ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x184287db12aa3e4a499e548f5ec36f3260d2cda7053185f8c0afdf482fc8962b450433922022-12-10 9:44:061 min ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x54e7a61809af2959a5f334b984faf95984a488d63316270408c47471994bb7ad450432942022-12-10 9:43:342 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x54e7a61809af2959a5f334b984faf95984a488d63316270408c47471994bb7ad450432942022-12-10 9:43:342 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x23aea0cdf6e7592eb432621d7fe226999f7ea087754c1dfab5517e04dd4b6757450429672022-12-10 9:41:354 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x23aea0cdf6e7592eb432621d7fe226999f7ea087754c1dfab5517e04dd4b6757450429672022-12-10 9:41:354 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf2d077d53c76d2a08abd6400fc556324bdf671c21bb3be3ef7ab14f9db95065c450428352022-12-10 9:40:544 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf2d077d53c76d2a08abd6400fc556324bdf671c21bb3be3ef7ab14f9db95065c450428352022-12-10 9:40:544 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf238047c3ac2bbf7da442ba98d3da6cd3798cbb2e2fe97ac41885a555a75fd4c450425912022-12-10 9:39:446 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf238047c3ac2bbf7da442ba98d3da6cd3798cbb2e2fe97ac41885a555a75fd4c450425912022-12-10 9:39:446 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf406090dfc4eb3a1b9c36ed2157c3974e48066ef2b8b4147002bec5fb51c0d86450424032022-12-10 9:38:377 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xf406090dfc4eb3a1b9c36ed2157c3974e48066ef2b8b4147002bec5fb51c0d86450424032022-12-10 9:38:377 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x4a35a0b4a0bfe66a6dd04dc9d37ef83e6b11810723457665eeee2fd0f70546d1450423422022-12-10 9:38:187 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x4a35a0b4a0bfe66a6dd04dc9d37ef83e6b11810723457665eeee2fd0f70546d1450423422022-12-10 9:38:187 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x32025c444c1f8418161219063062445e8a2be80323b56ab01ce84b3d468c598e450402032022-12-10 9:26:2419 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x32025c444c1f8418161219063062445e8a2be80323b56ab01ce84b3d468c598e450402032022-12-10 9:26:2419 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xd9450bd383171569224a94ffd54a76bd99d48a33421eace0946dea17e772b55a450253852022-12-10 8:05:351 hr 40 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0xd9450bd383171569224a94ffd54a76bd99d48a33421eace0946dea17e772b55a450253852022-12-10 8:05:351 hr 40 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x25663040583427e099a71f0475c8838daa4128b24746fa32271d9b975389f156450151382022-12-10 7:04:402 hrs 41 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x25663040583427e099a71f0475c8838daa4128b24746fa32271d9b975389f156450151382022-12-10 7:04:402 hrs 41 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
0x72480e48a7385bf534d49e0e412c2e2e627e25616200c96cfb99db1a6a88707e450151342022-12-10 7:04:382 hrs 41 mins ago 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855 0xe61a61b9ce1bd12e17a53aeeee1005ef6c1b2e800 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
USDG

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Arbiscan on 2022-10-05
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IUSDG {
    function addVault(address _vault) external;

    function removeVault(address _vault) external;

    function mint(address _account, uint256 _amount) external;

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

/**
 * @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.
     */
    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.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        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.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @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 v3.3._
     */
    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 v3.3._
     */
    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);
            }
        }
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

interface IYieldTracker {
    function claim(address _account, address _receiver) external returns (uint256);

    function updateRewards(address _account) external;

    function getTokensPerInterval() external view returns (uint256);

    function claimable(address _account) external view returns (uint256);
}

interface IYieldToken {
    function totalStaked() external view returns (uint256);

    function stakedBalance(address _account) external view returns (uint256);

    function removeAdmin(address _account) external;
}

contract YieldToken is IERC20, IYieldToken {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    string public name;
    string public symbol;
    uint8 public constant decimals = 18;

    uint256 public override totalSupply;
    uint256 public nonStakingSupply;

    address public gov;

    mapping(address => uint256) public balances;
    mapping(address => mapping(address => uint256)) public allowances;

    address[] public yieldTrackers;
    mapping(address => bool) public nonStakingAccounts;
    mapping(address => bool) public admins;

    bool public inWhitelistMode;
    mapping(address => bool) public whitelistedHandlers;

    modifier onlyGov() {
        require(msg.sender == gov, "YieldToken: forbidden");
        _;
    }

    modifier onlyAdmin() {
        require(admins[msg.sender], "YieldToken: forbidden");
        _;
    }

    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _initialSupply
    ) public {
        name = _name;
        symbol = _symbol;
        gov = msg.sender;
        admins[msg.sender] = true;
        _mint(msg.sender, _initialSupply);
    }

    function setGov(address _gov) external onlyGov {
        gov = _gov;
    }

    function setInfo(string memory _name, string memory _symbol) external onlyGov {
        name = _name;
        symbol = _symbol;
    }

    function setYieldTrackers(address[] memory _yieldTrackers) external onlyGov {
        yieldTrackers = _yieldTrackers;
    }

    function addAdmin(address _account) external onlyGov {
        admins[_account] = true;
    }

    function removeAdmin(address _account) external override onlyGov {
        admins[_account] = false;
    }

    // to help users who accidentally send their tokens to this contract
    function withdrawToken(
        address _token,
        address _account,
        uint256 _amount
    ) external onlyGov {
        IERC20(_token).safeTransfer(_account, _amount);
    }

    function setInWhitelistMode(bool _inWhitelistMode) external onlyGov {
        inWhitelistMode = _inWhitelistMode;
    }

    function setWhitelistedHandler(address _handler, bool _isWhitelisted) external onlyGov {
        whitelistedHandlers[_handler] = _isWhitelisted;
    }

    function addNonStakingAccount(address _account) external onlyAdmin {
        require(!nonStakingAccounts[_account], "YieldToken: _account already marked");
        _updateRewards(_account);
        nonStakingAccounts[_account] = true;
        nonStakingSupply = nonStakingSupply.add(balances[_account]);
    }

    function removeNonStakingAccount(address _account) external onlyAdmin {
        require(nonStakingAccounts[_account], "YieldToken: _account not marked");
        _updateRewards(_account);
        nonStakingAccounts[_account] = false;
        nonStakingSupply = nonStakingSupply.sub(balances[_account]);
    }

    function recoverClaim(address _account, address _receiver) external onlyAdmin {
        for (uint256 i = 0; i < yieldTrackers.length; i++) {
            address yieldTracker = yieldTrackers[i];
            IYieldTracker(yieldTracker).claim(_account, _receiver);
        }
    }

    function claim(address _receiver) external {
        for (uint256 i = 0; i < yieldTrackers.length; i++) {
            address yieldTracker = yieldTrackers[i];
            IYieldTracker(yieldTracker).claim(msg.sender, _receiver);
        }
    }

    function totalStaked() external view override returns (uint256) {
        return totalSupply.sub(nonStakingSupply);
    }

    function balanceOf(address _account) external view override returns (uint256) {
        return balances[_account];
    }

    function stakedBalance(address _account) external view override returns (uint256) {
        if (nonStakingAccounts[_account]) {
            return 0;
        }
        return balances[_account];
    }

    function transfer(address _recipient, uint256 _amount) external override returns (bool) {
        _transfer(msg.sender, _recipient, _amount);
        return true;
    }

    function allowance(address _owner, address _spender) external view override returns (uint256) {
        return allowances[_owner][_spender];
    }

    function approve(address _spender, uint256 _amount) external override returns (bool) {
        _approve(msg.sender, _spender, _amount);
        return true;
    }

    function transferFrom(
        address _sender,
        address _recipient,
        uint256 _amount
    ) external override returns (bool) {
        uint256 nextAllowance = allowances[_sender][msg.sender].sub(
            _amount,
            "YieldToken: transfer amount exceeds allowance"
        );
        _approve(_sender, msg.sender, nextAllowance);
        _transfer(_sender, _recipient, _amount);
        return true;
    }

    function _mint(address _account, uint256 _amount) internal {
        require(_account != address(0), "YieldToken: mint to the zero address");

        _updateRewards(_account);

        totalSupply = totalSupply.add(_amount);
        balances[_account] = balances[_account].add(_amount);

        if (nonStakingAccounts[_account]) {
            nonStakingSupply = nonStakingSupply.add(_amount);
        }

        emit Transfer(address(0), _account, _amount);
    }

    function _burn(address _account, uint256 _amount) internal {
        require(_account != address(0), "YieldToken: burn from the zero address");

        _updateRewards(_account);

        balances[_account] = balances[_account].sub(_amount, "YieldToken: burn amount exceeds balance");
        totalSupply = totalSupply.sub(_amount);

        if (nonStakingAccounts[_account]) {
            nonStakingSupply = nonStakingSupply.sub(_amount);
        }

        emit Transfer(_account, address(0), _amount);
    }

    function _transfer(
        address _sender,
        address _recipient,
        uint256 _amount
    ) private {
        require(_sender != address(0), "YieldToken: transfer from the zero address");
        require(_recipient != address(0), "YieldToken: transfer to the zero address");

        if (inWhitelistMode) {
            require(whitelistedHandlers[msg.sender], "YieldToken: msg.sender not whitelisted");
        }

        _updateRewards(_sender);
        _updateRewards(_recipient);

        balances[_sender] = balances[_sender].sub(_amount, "YieldToken: transfer amount exceeds balance");
        balances[_recipient] = balances[_recipient].add(_amount);

        if (nonStakingAccounts[_sender]) {
            nonStakingSupply = nonStakingSupply.sub(_amount);
        }
        if (nonStakingAccounts[_recipient]) {
            nonStakingSupply = nonStakingSupply.add(_amount);
        }

        emit Transfer(_sender, _recipient, _amount);
    }

    function _approve(
        address _owner,
        address _spender,
        uint256 _amount
    ) private {
        require(_owner != address(0), "YieldToken: approve from the zero address");
        require(_spender != address(0), "YieldToken: approve to the zero address");

        allowances[_owner][_spender] = _amount;

        emit Approval(_owner, _spender, _amount);
    }

    function _updateRewards(address _account) private {
        for (uint256 i = 0; i < yieldTrackers.length; i++) {
            address yieldTracker = yieldTrackers[i];
            IYieldTracker(yieldTracker).updateRewards(_account);
        }
    }
}

contract USDG is YieldToken, IUSDG {
    mapping(address => bool) public vaults;

    modifier onlyVault() {
        require(vaults[msg.sender], "USDG: forbidden");
        _;
    }

    constructor(address _vault) public YieldToken("USD Gambit", "USDG", 0) {
        vaults[_vault] = true;
    }

    function addVault(address _vault) external override onlyGov {
        vaults[_vault] = true;
    }

    function removeVault(address _vault) external override onlyGov {
        vaults[_vault] = false;
    }

    function mint(address _account, uint256 _amount) external override onlyVault {
        _mint(_account, _amount);
    }

    function burn(address _account, uint256 _amount) external override onlyVault {
        _burn(_account, _amount);
    }
}

Contract ABI

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

000000000000000000000000dfba8ad57d2c62f61f0a60b2c508bcdeb182f855

-----Decoded View---------------
Arg [0] : _vault (address): 0xdfba8ad57d2c62f61f0a60b2c508bcdeb182f855

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dfba8ad57d2c62f61f0a60b2c508bcdeb182f855


Deployed ByteCode Sourcemap

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Metadata Hash

5d66918348cc9906623e2b7ccde9760e8c2432ba79a9773377d44703ad366117
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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