Contract 0xa3BeD4E1c75D00fa6f4E5E6922DB7261B5E9AcD2 5

 
 
Txn Hash
Method
Block
From
To
Value
0x8d84b3a15d2e1c84560a981411169b6420164503efcfefd63d23ac39d0bf915cApprove153262472022-08-12 9:32:559 hrs 44 mins ago0x8f2ab364dc8f0b49af8e97356028c47647d48352 IN  mStable: MTA Token0 Ether0.‍00053258 11.‍5174188
0x4e70ce9385ad32272329b003606d7aa3c2d7d1e0270cc64e6b2081664e297c9eApprove153255612022-08-12 6:57:3012 hrs 20 mins ago0xc1791da88cc94c9a39e606d8760183d21268dcbb IN  mStable: MTA Token0 Ether0.‍00049422 10.‍6270402
0xb14c4d6aa93bef95617425d2e4c4d3b668b3b6927bdffd3e2157cf94d34c11fdApprove153241982022-08-12 1:43:3217 hrs 34 mins ago0xc69adca4485c0c494f34e9aa6b0a31f343f76411 IN  mStable: MTA Token0 Ether0.‍00076225 16.‍39052289
0xe67a1fe59b860f06232a261305e026d327aff75a290b2200a4493ad68317cb40Transfer153241922022-08-12 1:42:1917 hrs 35 mins ago0x94c5a4b47f49afdddda4c781a5b3e47882c05bbf IN  mStable: MTA Token0 Ether0.‍00063805 13.‍60951423
0xfe3ef10f6b9ae7f4582c5f13e3c8787ed410e00f5e204839632ff64dd5d31ca5Transfer153217102022-08-11 16:17:261 day 3 hrs agoGate.io IN  mStable: MTA Token0 Ether0.‍00192381 37.‍23191532
0x7db2707d3f1ca8da5c56383f24762771d30be6e05f96343ad421f2a20f68d1bdApprove153209852022-08-11 13:31:181 day 5 hrs ago0xc8c393189a1dffbb098ecdefc44506502b2d8e4d IN  mStable: MTA Token0 Ether0.‍00202295 43.‍49872425
0x52132dc47411887e363c7852a787a09152bb180128084119081c0d5762b28146Transfer153201492022-08-11 10:20:401 day 8 hrs ago0x8dc8ab6b9c45fe50c328a69920a7418065bef7b5 IN  mStable: MTA Token0 Ether0.‍000627313.‍38370987
0xe3b62056c5c7a622abfb458863b5ef3a53c83f5eb6df7055bd47a2a9a333bc6eTransfer153191982022-08-11 6:39:381 day 12 hrs agoCoinone IN  mStable: MTA Token0 Ether0.‍00049168 14.‍22240346
0x3f03a841b563bf6e94ac35dd764d1dc41f481b4acad7d4dd24b06e60a1bfab71Approve153188752022-08-11 5:28:191 day 13 hrs ago0x0f04011187406d76a8fa6f86b0b87c6724cd6a5d IN  mStable: MTA Token0 Ether0.‍00045727 18.‍87869692
0xdfd58ea77c15d17e0c18013eb5e78181105c6328556cbc6728aa035913547e98Transfer153181552022-08-11 2:40:551 day 16 hrs ago0xd9408f29026e32852aff8c5c9c8ea834b44b4e1c IN  mStable: MTA Token0 Ether0.‍0004799416.‍10828563
0xa3c435523e4040294fabd4694d302e20d84683f1eeb85c6c02773da88c1bcf87Transfer153181402022-08-11 2:37:531 day 16 hrs agoMEXC: Mexc.com IN  mStable: MTA Token0 Ether0.‍0007420721.‍46534123
0x1c0116f562ebb63ab5a61d67d30c235303e0d3fffb7c04ef94412ab7ca798559Approve153147112022-08-10 13:52:122 days 5 hrs ago0xcf63e1c31805254b6fb3ed7829206c2b2505e3a7 IN  mStable: MTA Token0 Ether0.‍00240617 52.‍06139913
0xc202d9b997717f61c34f549c31da7a2452901cafc6db36588b5c7d11e8444f3bApprove153146522022-08-10 13:39:182 days 5 hrs agoENS Name paradigmxyz.eth IN  mStable: MTA Token0 Ether0.‍00125532 26.‍99265351
0x6d283441a379ece6af25be02ffd57f05695062ebdca5b507e553d5d0bbcb3c1eTransfer153145942022-08-10 13:26:112 days 5 hrs ago0xd663eb208f69dd8e939327472feddd3e9f58b34b IN  mStable: MTA Token0 Ether0.‍00175043 37.‍32664769
0x063a61dbfc12756adeb0ebedf6ec864bd6147d5fe6b561551f61de5719181635Transfer153144642022-08-10 12:58:522 days 6 hrs agoMEXC: Mexc.com IN  mStable: MTA Token0 Ether0.‍0034118766
0xe935470e62c3572cf17bd91c08844a9554631cf835d07a0cbaaebbd8e5742705Transfer153128662022-08-10 6:49:292 days 12 hrs agoCoinone IN  mStable: MTA Token0 Ether0.‍00061836 11.‍96451513
0x38b551a55a5e94c97776bb3f8f60b6a689ad06d525a674250177ccb0026a8ec9Transfer153120632022-08-10 3:44:272 days 15 hrs agoHuobi 10 IN  mStable: MTA Token0 Ether0.‍0010374930
0x01037d88afb44384e958dc86b10ed2ec53d8931ea7618317ae8929c1e28a7a73Approve153114852022-08-10 1:32:372 days 17 hrs ago0xd7a0732c09712379a7d7ab888b91eeda420b61ee IN  mStable: MTA Token0 Ether0.‍00037392 8.‍0925905
0xfad8b87f44802e5f0a0fb13a63d73780c57f4fd9f18392c47e2631ded7124dc7Approve153104472022-08-09 21:40:292 days 21 hrs ago0x1329717299243171ac96bc070fd172c64f13e72e IN  mStable: MTA Token0 Ether0.‍00048153 10.‍35418881
0xefa8b7596cf2f3e9c87cba0893002a478632f85161443d35e07a2490059e54a4Transfer153104272022-08-09 21:36:182 days 21 hrs ago0xaae493e652fa191983a18cede5563e2e28f9ec0a IN  mStable: MTA Token0 Ether0.‍00189943 63.‍75
0x16e99c6a6a0d055925d6a98dcb4d6878534beef2782a2797fed3ff6049d34093Transfer153104222022-08-09 21:35:052 days 21 hrs ago0xaae493e652fa191983a18cede5563e2e28f9ec0a IN  mStable: MTA Token0 Ether0.‍00068013 13.‍16272328
0x43b14661b734d761de8be9d3ae2cab051a63743d21e101587ce572eeb21c08b0Approve153104032022-08-09 21:30:462 days 21 hrs ago0x537f83ea54e89c967cef5fc313c9160ed2a4ae5c IN  mStable: MTA Token0 Ether0.‍00036002 14.‍8634134
0x080ce50c91ff789e8a7e17d34b9e22de1fdf1e180cce01ab0cc3fe7b3cdac568Approve153092512022-08-09 17:18:133 days 1 hr ago0x6a634f1bec0e530c41cb81241acc74fd0e3acb11 IN  mStable: MTA Token0 Ether0.‍00131576 28.‍46130071
0x29cced82bb26fc09c222041d7091c79f13dff21dfc4046e413db9e4b71dae84aTransfer From153080642022-08-09 12:45:353 days 6 hrs agoCEX.IO IN  mStable: MTA Token0 Ether0.‍000451612
0x845dc8b84e6481458b706a8475d100a907e9d7056b9ebd70c51e90b69eaf76eaApprove153080452022-08-09 12:39:553 days 6 hrs ago0xc9897253b51ca78f0a92d6fb4c30a1d8d863f328 IN  mStable: MTA Token0 Ether0.‍0005580712
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OVERVIEW

mStable is a protocol that unites stablecoins, lending, and swapping into one robust and easy to use standard.

Latest 1 internal transaction
Parent Txn Hash Block From To Value
0x9373c12b57114805eda96acad0d5cf01de6fd23e705e36531c75c403f43b7e87106680352020-08-16 1:05:13726 days 18 hrs ago 0x66bd73b2262afc1d19158e4e0191fdffb0b030e0 mStable: MTA Token0.‍109 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
MetaToken

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, GNU AGPLv3 license, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2021-09-29
*/

pragma solidity 0.5.16;


contract ModuleKeys {

    // Governance
    // ===========
                                                // Phases
    // keccak256("Governance");                 // 2.x
    bytes32 internal constant KEY_GOVERNANCE = 0x9409903de1e6fd852dfc61c9dacb48196c48535b60e25abf92acc92dd689078d;
    //keccak256("Staking");                     // 1.2
    bytes32 internal constant KEY_STAKING = 0x1df41cd916959d1163dc8f0671a666ea8a3e434c13e40faef527133b5d167034;
    //keccak256("ProxyAdmin");                  // 1.0
    bytes32 internal constant KEY_PROXY_ADMIN = 0x96ed0203eb7e975a4cbcaa23951943fa35c5d8288117d50c12b3d48b0fab48d1;

    // mStable
    // =======
    // keccak256("OracleHub");                  // 1.2
    bytes32 internal constant KEY_ORACLE_HUB = 0x8ae3a082c61a7379e2280f3356a5131507d9829d222d853bfa7c9fe1200dd040;
    // keccak256("Manager");                    // 1.2
    bytes32 internal constant KEY_MANAGER = 0x6d439300980e333f0256d64be2c9f67e86f4493ce25f82498d6db7f4be3d9e6f;
    //keccak256("Recollateraliser");            // 2.x
    bytes32 internal constant KEY_RECOLLATERALISER = 0x39e3ed1fc335ce346a8cbe3e64dd525cf22b37f1e2104a755e761c3c1eb4734f;
    //keccak256("MetaToken");                   // 1.1
    bytes32 internal constant KEY_META_TOKEN = 0xea7469b14936af748ee93c53b2fe510b9928edbdccac3963321efca7eb1a57a2;
    // keccak256("SavingsManager");             // 1.0
    bytes32 internal constant KEY_SAVINGS_MANAGER = 0x12fe936c77a1e196473c4314f3bed8eeac1d757b319abb85bdda70df35511bf1;
}

interface INexus {
    function governor() external view returns (address);
    function getModule(bytes32 key) external view returns (address);

    function proposeModule(bytes32 _key, address _addr) external;
    function cancelProposedModule(bytes32 _key) external;
    function acceptProposedModule(bytes32 _key) external;
    function acceptProposedModules(bytes32[] calldata _keys) external;

    function requestLockModule(bytes32 _key) external;
    function cancelLockModule(bytes32 _key) external;
    function lockModule(bytes32 _key) external;
}

contract Module is ModuleKeys {

    INexus public nexus;

    /**
     * @dev Initialises the Module by setting publisher addresses,
     *      and reading all available system module information
     */
    constructor(address _nexus) internal {
        require(_nexus != address(0), "Nexus is zero address");
        nexus = INexus(_nexus);
    }

    /**
     * @dev Modifier to allow function calls only from the Governor.
     */
    modifier onlyGovernor() {
        require(msg.sender == _governor(), "Only governor can execute");
        _;
    }

    /**
     * @dev Modifier to allow function calls only from the Governance.
     *      Governance is either Governor address or Governance address.
     */
    modifier onlyGovernance() {
        require(
            msg.sender == _governor() || msg.sender == _governance(),
            "Only governance can execute"
        );
        _;
    }

    /**
     * @dev Modifier to allow function calls only from the ProxyAdmin.
     */
    modifier onlyProxyAdmin() {
        require(
            msg.sender == _proxyAdmin(), "Only ProxyAdmin can execute"
        );
        _;
    }

    /**
     * @dev Modifier to allow function calls only from the Manager.
     */
    modifier onlyManager() {
        require(msg.sender == _manager(), "Only manager can execute");
        _;
    }

    /**
     * @dev Returns Governor address from the Nexus
     * @return Address of Governor Contract
     */
    function _governor() internal view returns (address) {
        return nexus.governor();
    }

    /**
     * @dev Returns Governance Module address from the Nexus
     * @return Address of the Governance (Phase 2)
     */
    function _governance() internal view returns (address) {
        return nexus.getModule(KEY_GOVERNANCE);
    }

    /**
     * @dev Return Staking Module address from the Nexus
     * @return Address of the Staking Module contract
     */
    function _staking() internal view returns (address) {
        return nexus.getModule(KEY_STAKING);
    }

    /**
     * @dev Return ProxyAdmin Module address from the Nexus
     * @return Address of the ProxyAdmin Module contract
     */
    function _proxyAdmin() internal view returns (address) {
        return nexus.getModule(KEY_PROXY_ADMIN);
    }

    /**
     * @dev Return MetaToken Module address from the Nexus
     * @return Address of the MetaToken Module contract
     */
    function _metaToken() internal view returns (address) {
        return nexus.getModule(KEY_META_TOKEN);
    }

    /**
     * @dev Return OracleHub Module address from the Nexus
     * @return Address of the OracleHub Module contract
     */
    function _oracleHub() internal view returns (address) {
        return nexus.getModule(KEY_ORACLE_HUB);
    }

    /**
     * @dev Return Manager Module address from the Nexus
     * @return Address of the Manager Module contract
     */
    function _manager() internal view returns (address) {
        return nexus.getModule(KEY_MANAGER);
    }

    /**
     * @dev Return SavingsManager Module address from the Nexus
     * @return Address of the SavingsManager Module contract
     */
    function _savingsManager() internal view returns (address) {
        return nexus.getModule(KEY_SAVINGS_MANAGER);
    }

    /**
     * @dev Return Recollateraliser Module address from the Nexus
     * @return  Address of the Recollateraliser Module contract (Phase 2)
     */
    function _recollateraliser() internal view returns (address) {
        return nexus.getModule(KEY_RECOLLATERALISER);
    }
}

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

/**
 * @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);
}

/**
 * @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;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _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 {
        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 {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

contract GovernedMinterRole is Module {

    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor(address _nexus) internal Module(_nexus) {
    }

    modifier onlyMinter() {
        require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyGovernor {
        _addMinter(account);
    }

    function removeMinter(address account) public onlyGovernor {
        _removeMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(msg.sender);
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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 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 ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev See {ERC20-_burnFrom}.
     */
    function burnFrom(address account, uint256 amount) public {
        _burnFrom(account, amount);
    }
}

/**
 * @title  MetaToken
 * @dev    MetaToken is an ERC20 token, with mint privileges governed by mStable
 * governors
 */
contract MetaToken is
    ERC20,
    GovernedMinterRole,
    ERC20Detailed,
    ERC20Burnable
{

    /**
     * @dev MetaToken simply implements a detailed ERC20 token,
     * and a governed list of minters
     */
    constructor(
        address _nexus,
        address _initialRecipient
    )
        public
        GovernedMinterRole(_nexus)
        ERC20Detailed(
            "Meta",
            "MTA",
            18
        )
    {
        // 100m initial supply
        _mint(_initialRecipient, 100000000 * (10 ** 18));
    }

    // Forked from @openzeppelin
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
}

Contract Security Audit

Contract ABI

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INexus","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"removeMinter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceMinter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000afce80b19a8ce13dec0739a1aab7a028d6845eb300000000000000000000000019f12c947d25ff8a3b748829d8001ca09a28d46d

-----Decoded View---------------
Arg [0] : _nexus (address): 0xafce80b19a8ce13dec0739a1aab7a028d6845eb3
Arg [1] : _initialRecipient (address): 0x19f12c947d25ff8a3b748829d8001ca09a28d46d

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000afce80b19a8ce13dec0739a1aab7a028d6845eb3
Arg [1] : 00000000000000000000000019f12c947d25ff8a3b748829d8001ca09a28d46d


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://5f452136b332eb8154c56b969385146fa5ee7de26f7049025c4a823eb7eb1663
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.