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0x04bEf870dE607519c91d16A23434Ad5745f62A63

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xToken: Deployer at txn 0x835222d63695953433ebd47f7e4b6da5a64b2ec59bb43141aa185e70745c9ec1

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	Transaction Hash	Method	Block		From		To	Value
	0x835222d63695953433ebd47f7e4b6da5a64b2ec59bb43141aa185e70745c9ec1	0x60806040	10970937	2020-10-01 15:28:46	1369 days ago	1601566126	xToken: Deployer	IN	Create: xSNX	0 ETH	0.46617381	114

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xSNX

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v0.5.15+commit.6a57276f

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default evmVersion, None license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2020-10-01
*/

// File: @openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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: @openzeppelin/upgrades/contracts/Initializable.sol

pragma solidity >=0.4.24 <0.7.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    address self = address(this);
    uint256 cs;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol

pragma solidity ^0.5.0;


/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with 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 is Initializable {
    // 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;
    }
}

// File: @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;



/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be aplied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Initializable, Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function initialize(address sender) public initializer {
        _owner = sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * > Note: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    uint256[50] private ______gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @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: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;





/**
 * @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 Initializable, 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"));
    }

    uint256[50] private ______gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;



/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is Initializable, 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.
     */
    function initialize(string memory name, string memory symbol, uint8 decimals) public initializer {
        _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;
    }

    uint256[50] private ______gap;
}

// File: synthetix/contracts/interfaces/ISynth.sol

pragma solidity >=0.4.24;


interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}

// File: synthetix/contracts/interfaces/ISynthetix.sol

pragma solidity >=0.4.24;



interface ISynthetix {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint);

    function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey) external view returns (uint);

    function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) external view returns (uint);

    function transferableSynthetix(address account) external view returns (uint transferable);

    // Mutative Functions
    function burnSynths(uint amount) external;

    function burnSynthsOnBehalf(address burnForAddress, uint amount) external;

    function burnSynthsToTarget() external;

    function burnSynthsToTargetOnBehalf(address burnForAddress) external;

    function exchange(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeOnBehalf(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeWithTracking(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address originator,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeOnBehalfWithTracking(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address originator,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function issueMaxSynths() external;

    function issueMaxSynthsOnBehalf(address issueForAddress) external;

    function issueSynths(uint amount) external;

    function issueSynthsOnBehalf(address issueForAddress, uint amount) external;

    function mint() external returns (bool);

    function settle(bytes32 currencyKey)
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntries
        );

    function liquidateDelinquentAccount(address account, uint susdAmount) external returns (bool);
}

// File: synthetix/contracts/interfaces/IRewardEscrow.sol

pragma solidity >=0.4.24;


interface IRewardEscrow {
    // Views
    function balanceOf(address account) external view returns (uint);

    function numVestingEntries(address account) external view returns (uint);

    function totalEscrowedAccountBalance(address account) external view returns (uint);

    function totalVestedAccountBalance(address account) external view returns (uint);

    // Mutative functions
    function appendVestingEntry(address account, uint quantity) external;

    function vest() external;
}

// File: synthetix/contracts/interfaces/IExchangeRates.sol

pragma solidity >=0.4.24;


// https://docs.synthetix.io/contracts/source/interfaces/IExchangeRates
interface IExchangeRates {
    // Structs
    struct RateAndUpdatedTime {
        uint216 rate;
        uint40 time;
    }

    struct InversePricing {
        uint entryPoint;
        uint upperLimit;
        uint lowerLimit;
        bool frozenAtUpperLimit;
        bool frozenAtLowerLimit;
    }

    // Views
    function aggregators(bytes32 currencyKey) external view returns (address);

    function aggregatorWarningFlags() external view returns (address);

    function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool);

    function canFreezeRate(bytes32 currencyKey) external view returns (bool);

    function currentRoundForRate(bytes32 currencyKey) external view returns (uint);

    function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory);

    function effectiveValue(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external view returns (uint value);

    function effectiveValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveValueAtRound(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        uint roundIdForSrc,
        uint roundIdForDest
    ) external view returns (uint value);

    function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);

    function getLastRoundIdBeforeElapsedSecs(
        bytes32 currencyKey,
        uint startingRoundId,
        uint startingTimestamp,
        uint timediff
    ) external view returns (uint);

    function inversePricing(bytes32 currencyKey)
        external
        view
        returns (
            uint entryPoint,
            uint upperLimit,
            uint lowerLimit,
            bool frozenAtUpperLimit,
            bool frozenAtLowerLimit
        );

    function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256);

    function oracle() external view returns (address);

    function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);

    function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time);

    function rateForCurrency(bytes32 currencyKey) external view returns (uint);

    function rateIsFlagged(bytes32 currencyKey) external view returns (bool);

    function rateIsFrozen(bytes32 currencyKey) external view returns (bool);

    function rateIsInvalid(bytes32 currencyKey) external view returns (bool);

    function rateIsStale(bytes32 currencyKey) external view returns (bool);

    function rateStalePeriod() external view returns (uint);

    function ratesAndUpdatedTimeForCurrencyLastNRounds(bytes32 currencyKey, uint numRounds)
        external
        view
        returns (uint[] memory rates, uint[] memory times);

    function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory rates, bool anyRateInvalid);

    function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory);

    // Mutative functions
    function freezeRate(bytes32 currencyKey) external;
}

// File: synthetix/contracts/interfaces/ISynthetixState.sol

pragma solidity >=0.4.24;


interface ISynthetixState {
    // Views
    function debtLedger(uint index) external view returns (uint);

    function issuanceData(address account) external view returns (uint initialDebtOwnership, uint debtEntryIndex);

    function debtLedgerLength() external view returns (uint);

    function hasIssued(address account) external view returns (bool);

    function lastDebtLedgerEntry() external view returns (uint);

    // Mutative functions
    function incrementTotalIssuerCount() external;

    function decrementTotalIssuerCount() external;

    function setCurrentIssuanceData(address account, uint initialDebtOwnership) external;

    function appendDebtLedgerValue(uint value) external;

    function clearIssuanceData(address account) external;
}

// File: synthetix/contracts/interfaces/IAddressResolver.sol

pragma solidity >=0.4.24;


interface IAddressResolver {
    function getAddress(bytes32 name) external view returns (address);

    function getSynth(bytes32 key) external view returns (address);

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address);
}

// File: contracts/interface/ISystemSettings.sol

pragma solidity 0.5.15;

interface ISystemSettings {
    function issuanceRatio() external view returns(uint);
}

// File: contracts/interface/ICurveFi.sol

pragma solidity 0.5.15;

interface ICurveFi {
  function exchange(
    int128 i,
    int128 j,
    uint256 dx,
    uint256 min_dy
  ) external;
  function exchange_underlying(
    int128 i,
    int128 j,
    uint256 dx,
    uint256 min_dy
  ) external;
  function get_dx_underlying(
    int128 i,
    int128 j,
    uint256 dy
  ) external view returns (uint256);
  function get_dy_underlying(
    int128 i,
    int128 j,
    uint256 dx
  ) external view returns (uint256);
  function get_dx(
    int128 i,
    int128 j,
    uint256 dy
  ) external view returns (uint256);
  function get_dy(
    int128 i,
    int128 j,
    uint256 dx
  ) external view returns (uint256);
  function get_virtual_price() external view returns (uint256);
}

// File: contracts/interface/ISetToken.sol

pragma solidity 0.5.15;

interface ISetToken {
    function unitShares() external view returns(uint);
    function naturalUnit() external view returns(uint);
    function currentSet() external view returns(address);
    // function getUnits() external view returns (uint256[] memory);
}

// File: contracts/interface/IKyberNetworkProxy.sol

pragma solidity 0.5.15;


contract IKyberNetworkProxy {
    function getExpectedRate(ERC20 src, ERC20 dest, uint srcQty) external view returns (uint expectedRate, uint slippageRate);
    function swapEtherToToken(ERC20 token, uint minConversionRate) external payable returns(uint);
    function swapTokenToEther(ERC20 token, uint tokenQty, uint minRate) external payable returns(uint);
    function swapTokenToToken(ERC20 src, uint srcAmount, ERC20 dest, uint minConversionRate) public returns(uint);
}

// File: contracts/interface/ISetAssetBaseCollateral.sol

pragma solidity 0.5.15;

interface ISetAssetBaseCollateral {
    function getComponents() external view returns(address[] memory);
    function naturalUnit() external view returns(uint);
    function getUnits() external view returns (uint256[] memory);
}

// File: contracts/TradeAccounting.sol

pragma solidity 0.5.15;
















/*
	xSNX Target Allocation (assuming 800% C-RATIO)
	----------------------
	Allocation         |  NAV   | % NAV
	--------------------------------------
	800 SNX @ $1/token | $800   | 100%
	100 sUSD Debt	   | ($100)	| (12.5%)
	75 USD equiv Set   | $75    | 9.375%
	25 USD equiv ETH   | $25    | 3.125%
	--------------------------------------
	Total                $800   | 100%
 */

/*
	Conditions for `isRebalanceTowardsHedgeRequired` to return true
	Assuming 5% rebalance threshold

	Allocation         |  NAV   | % NAV
	--------------------------------------
	800 SNX @ $1/token | $800   | 100.63%
	105 sUSD Debt	   | ($105)	| (13.21%)
	75 USD equiv Set   | $75    | 9.43%
	25 USD equiv ETH   | $25    | 3.14%
	--------------------------------------
	Total                $795   | 100%

	Debt value		   | $105
	Hedge Assets	   | $100
	-------------------------
	Debt/hedge ratio   | 105%
  */

/*
	Conditions for `isRebalanceTowardsSnxRequired` to return true
	Assuming 5% rebalance threshold

	Allocation         |  NAV   | % NAV
	--------------------------------------
	800 SNX @ $1/token | $800   | 99.37%
	100 sUSD Debt	   | ($100)	| (12.42%)
	75 USD equiv Set   | $75    | 9.31%
	30 USD equiv ETH   | $30    | 3.72%
	--------------------------------------
	Total                $805   | 100%

	Hedge Assets	   | $105
	Debt value		   | $100
	-------------------------
	Hedge/debt ratio   | 105%
  */

contract TradeAccounting is Ownable {
    using SafeMath for uint256;

    uint256 private constant TEN = 10;
    uint256 private constant DEC_18 = 1e18;
    uint256 private constant PERCENT = 100;
    uint256 private constant ETH_TARGET = 4; // targets 1/4th of hedge portfolio
    uint256 private constant SLIPPAGE_RATE = 99;
    uint256 private constant MAX_UINT = 2**256 - 1;
    uint256 private constant RATE_STALE_TIME = 28800; // 8 hours
    uint256 private constant REBALANCE_THRESHOLD = 105; // 5%
    uint256 private constant INITIAL_SUPPLY_MULTIPLIER = 10;

    int128 usdcIndex;
    int128 susdIndex;

    ICurveFi private curveFi;
    ISynthetixState private synthetixState;
    IAddressResolver private addressResolver;
    IKyberNetworkProxy private kyberNetworkProxy;

    address private xSNXAdminInstance;
    address private addressValidator;

    address private setAddress;
    address private susdAddress;
    address private usdcAddress;

    address private nextCurveAddress;

    bytes32 constant snx = "SNX";
    bytes32 constant susd = "sUSD";
    bytes32 constant seth = "sETH";

    bytes32[2] synthSymbols;

    address[2] setComponentAddresses;

    bytes32 constant rewardEscrowName = "RewardEscrow";
    bytes32 constant exchangeRatesName = "ExchangeRates";
    bytes32 constant synthetixName = "Synthetix";
    bytes32 constant systemSettingsName = "SystemSettings";

    function initialize(
        address _setAddress,
        address _kyberProxyAddress,
        address _addressResolver,
        address _susdAddress,
        address _usdcAddress,
        address _addressValidator,
        bytes32[2] memory _synthSymbols,
        address[2] memory _setComponentAddresses,
        address _ownerAddress
    ) public initializer {
        Ownable.initialize(_ownerAddress);

        setAddress = _setAddress;
        kyberNetworkProxy = IKyberNetworkProxy(_kyberProxyAddress);
        addressResolver = IAddressResolver(_addressResolver);
        susdAddress = _susdAddress;
        usdcAddress = _usdcAddress;
        addressValidator = _addressValidator;
        synthSymbols = _synthSymbols;
        setComponentAddresses = _setComponentAddresses;
    }

    modifier onlyXSNXAdmin {
        require(
            msg.sender == xSNXAdminInstance,
            "Only xSNXAdmin contract can call"
        );
        _;
    }

    /* ========================================================================================= */
    /*                                         Kyber/Curve                                       */
    /* ========================================================================================= */

    /*
     * @dev Function that processes all token to token exchanges,
     * sometimes via Kyber and sometimes via a combination of Kyber & Curve
     * @dev Only callable by xSNXAdmin contract
     */
    function swapTokenToToken(
        address fromToken,
        uint256 amount,
        address toToken,
        uint256 minKyberRate,
        uint256 minCurveReturn
    ) public onlyXSNXAdmin {
        if (fromToken == susdAddress) {
            _exchangeUnderlying(susdIndex, usdcIndex, amount, minCurveReturn);

            if (toToken != usdcAddress) {
                uint256 usdcBal = getUsdcBalance();
                _swapTokenToToken(usdcAddress, usdcBal, toToken, minKyberRate);
            }
        } else if (toToken == susdAddress) {
            if (fromToken != usdcAddress) {
                _swapTokenToToken(fromToken, amount, usdcAddress, minKyberRate);
            }

            uint256 usdcBal = getUsdcBalance();
            _exchangeUnderlying(usdcIndex, susdIndex, usdcBal, minCurveReturn);
        } else {
            _swapTokenToToken(fromToken, amount, toToken, minKyberRate);
        }

        IERC20(toToken).transfer(
            xSNXAdminInstance,
            IERC20(toToken).balanceOf(address(this))
        );
    }

    function _swapTokenToToken(
        address _fromToken,
        uint256 _amount,
        address _toToken,
        uint256 _minKyberRate
    ) private {
        kyberNetworkProxy.swapTokenToToken(
            ERC20(_fromToken),
            _amount,
            ERC20(_toToken),
            _minKyberRate
        );
    }

    /*
     * @dev Function that processes all token to ETH exchanges,
     * sometimes via Kyber and sometimes via a combination of Kyber & Curve
     * @dev Only callable by xSNXAdmin contract
     */
    function swapTokenToEther(
        address fromToken,
        uint256 amount,
        uint256 minKyberRate,
        uint256 minCurveReturn
    ) public onlyXSNXAdmin {
        if (fromToken == susdAddress) {
            _exchangeUnderlying(susdIndex, usdcIndex, amount, minCurveReturn);

            uint256 usdcBal = getUsdcBalance();
            _swapTokenToEther(usdcAddress, usdcBal, minKyberRate);
        } else {
            _swapTokenToEther(fromToken, amount, minKyberRate);
        }

        uint256 ethBal = address(this).balance;
        (bool success, ) = msg.sender.call.value(ethBal)("");
        require(success, "Transfer failed");
    }

    function _swapTokenToEther(
        address _fromToken,
        uint256 _amount,
        uint256 _minKyberRate
    ) private {
        kyberNetworkProxy.swapTokenToEther(
            ERC20(_fromToken),
            _amount,
            _minKyberRate
        );
    }

    function _exchangeUnderlying(
        int128 _inputIndex,
        int128 _outputIndex,
        uint256 _amount,
        uint256 _minReturn
    ) private {
        curveFi.exchange_underlying(
            _inputIndex,
            _outputIndex,
            _amount,
            _minReturn
        );
    }

    function getUsdcBalance() internal view returns (uint256) {
        return IERC20(usdcAddress).balanceOf(address(this));
    }

    /* ========================================================================================= */
    /*                                          NAV                                              */
    /* ========================================================================================= */

    function getEthBalance() public view returns (uint256) {
        return address(xSNXAdminInstance).balance;
    }

    /*
     * @dev Helper function for `xSNX.burn` that outputs NAV
     * redemption value in ETH terms
     * @param totalSupply: xSNX.totalSupply()
     * @param tokensToRedeem: xSNX to burn
     */
    function calculateRedemptionValue(
        uint256 totalSupply,
        uint256 tokensToRedeem
    ) public view returns (uint256 valueToRedeem) {
        uint256 snxBalanceOwned = getSnxBalanceOwned();
        uint256 contractDebtValue = getContractDebtValue();

        uint256 pricePerToken = calculateRedeemTokenPrice(
            totalSupply,
            snxBalanceOwned,
            contractDebtValue
        );

        valueToRedeem = pricePerToken.mul(tokensToRedeem).div(DEC_18);
    }

    /*
     * @dev Helper function for `xSNX.mint` that
     * 1) determines whether ETH contribution should be maintained in ETH or exchanged for SNX and
     * 2) outputs the `nonSnxAssetValue` value to be used in NAV calculation
     * @param totalSupply: xSNX.totalSupply()
     */
    function getMintWithEthUtils(uint256 totalSupply)
        public
        view
        returns (bool allocateToEth, uint256 nonSnxAssetValue)
    {
        uint256 setHoldingsInWei = getSetHoldingsValueInWei();

        // called before eth transferred from xSNX to xSNXAdmin
        uint256 ethBalBefore = getEthBalance();

        allocateToEth = shouldAllocateEthToEthReserve(
            setHoldingsInWei,
            ethBalBefore,
            totalSupply
        );
        nonSnxAssetValue = setHoldingsInWei.add(ethBalBefore);
    }

    /*
     * @notice xSNX system targets 25% of hedge portfolio to be maintained in ETH
     * @dev Function produces binary yes allocate/no allocate decision point
     * determining whether ETH sent on xSNX.mint() is held or exchanged
     * @param setHoldingsInWei: value of Set portfolio in ETH terms
     * @param ethBalBefore: value of ETH reserve prior to tx
     * @param totalSupply: xSNX.totalSupply()
     */
    function shouldAllocateEthToEthReserve(
        uint256 setHoldingsInWei,
        uint256 ethBalBefore,
        uint256 totalSupply
    ) public pure returns (bool allocateToEth) {
        if (totalSupply == 0) return false;

        if (ethBalBefore.mul(ETH_TARGET) < ethBalBefore.add(setHoldingsInWei)) {
            // ETH reserve is under target
            return true;
        }

        return false;
    }

    /*
     * @dev Helper function for calculateIssueTokenPrice
     * @dev Called indirectly by `xSNX.mint` and `xSNX.mintWithSnx`
     * @dev Calculates NAV of the fund, including value of escrowed SNX, in ETH terms
     * @param weiPerOneSnx: SNX price in ETH terms
     * @param snxBalanceBefore: SNX balance pre-mint
     * @param nonSnxAssetValue: NAV of non-SNX slice of fund
     */
    function calculateNetAssetValueOnMint(
        uint256 weiPerOneSnx,
        uint256 snxBalanceBefore,
        uint256 nonSnxAssetValue
    ) internal view returns (uint256) {
        uint256 snxTokenValueInWei = snxBalanceBefore.mul(weiPerOneSnx).div(
            DEC_18
        );
        uint256 contractDebtValue = getContractDebtValue();
        uint256 contractDebtValueInWei = calculateDebtValueInWei(
            contractDebtValue
        );
        return
            snxTokenValueInWei.add(nonSnxAssetValue).sub(
                contractDebtValueInWei
            );
    }

    /*
     * @dev Helper function for calculateRedeemTokenPrice
     * @dev Called indirectly by `xSNX.burn`
     * @dev Calculates NAV of the fund, excluding value of escrowed SNX, in ETH terms
     * @param weiPerOneSnx: SNX price in ETH terms
     * @param snxBalanceOwned: non-escrowed SNX balance
     * @param contractDebtValueInWei: sUSD debt balance of fund in ETH terms
     */
    function calculateNetAssetValueOnRedeem(
        uint256 weiPerOneSnx,
        uint256 snxBalanceOwned,
        uint256 contractDebtValueInWei
    ) internal view returns (uint256) {
        uint256 snxTokenValueInWei = snxBalanceOwned.mul(weiPerOneSnx).div(
            DEC_18
        );
        uint256 nonSnxAssetValue = calculateNonSnxAssetValue();
        return
            snxTokenValueInWei.add(nonSnxAssetValue).sub(
                contractDebtValueInWei
            );
    }

    /*
     * @dev NAV value of non-SNX assets, computed in ETH terms
     */
    function calculateNonSnxAssetValue() internal view returns (uint256) {
        return getSetHoldingsValueInWei().add(getEthBalance());
    }

    /*
     * @dev SNX price in ETH terms, calculated for purposes of redemption NAV
     * @notice Return value discounted slightly to better represent liquidation price
     */
    function getWeiPerOneSnxOnRedeem()
        internal
        view
        returns (uint256 weiPerOneSnx)
    {
        uint256 snxUsdPrice = getSnxPrice();
        uint256 ethUsdPrice = getSynthPrice(seth);
        weiPerOneSnx = snxUsdPrice
            .mul(DEC_18)
            .div(ethUsdPrice)
            .mul(SLIPPAGE_RATE) // used to better represent liquidation price as volume scales
            .div(PERCENT);
    }

    /*
     * @dev Returns Synthetix synth symbol for asset currently held in TokenSet (e.g., sETH for WETH)
     * @notice xSNX contract complex only compatible with Sets that hold a single asset at a time
     */
    function getActiveAssetSynthSymbol()
        internal
        view
        returns (bytes32 synthSymbol)
    {
        synthSymbol = getAssetCurrentlyActiveInSet() == setComponentAddresses[0]
            ? (synthSymbols[0])
            : (synthSymbols[1]);
    }

    /*
     * @dev Returns SNX price in ETH terms, calculated for purposes of issuance NAV (when allocateToEth)
     */
    function getWeiPerOneSnxOnMint() internal view returns (uint256) {
        uint256 snxUsd = getSynthPrice(snx);
        uint256 ethUsd = getSynthPrice(seth);
        return snxUsd.mul(DEC_18).div(ethUsd);
    }

    /*
     * @dev Single use function to define initial xSNX issuance
     */
    function getInitialSupply() internal view returns (uint256) {
        return
            IERC20(addressResolver.getAddress(synthetixName))
                .balanceOf(xSNXAdminInstance)
                .mul(INITIAL_SUPPLY_MULTIPLIER);
    }

    /*
     * @dev Helper function for `xSNX.mint` that calculates token issuance
     * @param snxBalanceBefore: SNX balance pre-mint
     * @param ethContributed: ETH payable on mint, less fees
     * @param nonSnxAssetValue: NAV of non-SNX slice of fund
     * @param totalSupply: xSNX.totalSupply()
     * @param allocateToEth: bool determining whether ETH payable is reserved in ETH or exchanged
     */
    function calculateTokensToMintWithEth(
        uint256 snxBalanceBefore,
        uint256 ethContributed,
        uint256 nonSnxAssetValue,
        uint256 totalSupply,
        bool allocateToEth
    ) public view returns (uint256) {
        if (totalSupply == 0) {
            return getInitialSupply();
        }

        uint256 weiPerOneSnx;
        if (allocateToEth) {
            weiPerOneSnx = getWeiPerOneSnxOnMint();
        } else {
            uint256 snxBalanceAfter = getSnxBalance();
            uint256 snxContributed = snxBalanceAfter.sub(snxBalanceBefore);
            weiPerOneSnx = ethContributed.mul(DEC_18).div(snxContributed);
        }

        uint256 pricePerToken = calculateIssueTokenPrice(
            weiPerOneSnx,
            snxBalanceBefore,
            nonSnxAssetValue,
            totalSupply
        );

        return ethContributed.mul(DEC_18).div(pricePerToken);
    }

    /*
     * @dev Helper function for `xSNX.mintWithSnx` that calculates token issuance
     * @param snxBalanceBefore: SNX balance pre-mint
     * @param snxAddedToBalance: SNX contributed by mint
     * @param totalSupply: xSNX.totalSupply()
     */
    function calculateTokensToMintWithSnx(
        uint256 snxBalanceBefore,
        uint256 snxAddedToBalance,
        uint256 totalSupply
    ) public view returns (uint256) {
        if (totalSupply == 0) {
            return getInitialSupply();
        }

        uint256 weiPerOneSnx = getWeiPerOneSnxOnMint();
        // need to derive snx contribution in eth terms for NAV calc
        uint256 proxyEthContribution = weiPerOneSnx.mul(snxAddedToBalance).div(
            DEC_18
        );
        uint256 nonSnxAssetValue = calculateNonSnxAssetValue();
        uint256 pricePerToken = calculateIssueTokenPrice(
            weiPerOneSnx,
            snxBalanceBefore,
            nonSnxAssetValue,
            totalSupply
        );
        return proxyEthContribution.mul(DEC_18).div(pricePerToken);
    }

    /*
     * @dev Called indirectly by `xSNX.mint` and `xSNX.mintWithSnx`
     * @dev Calculates token price on issuance, including value of escrowed SNX
     * @param weiPerOneSnx: SNX price in ETH terms
     * @param snxBalanceBefore: SNX balance pre-mint
     * @param nonSnxAssetValue: Non-SNX slice of fund
     * @param totalSupply: xSNX.totalSupply()
     */
    function calculateIssueTokenPrice(
        uint256 weiPerOneSnx,
        uint256 snxBalanceBefore,
        uint256 nonSnxAssetValue,
        uint256 totalSupply
    ) public view returns (uint256 pricePerToken) {
        pricePerToken = calculateNetAssetValueOnMint(
            weiPerOneSnx,
            snxBalanceBefore,
            nonSnxAssetValue
        )
            .mul(DEC_18)
            .div(totalSupply);
    }

    /*
     * @dev Called indirectly by `xSNX.burn`
     * @dev Calculates token price on redemption, excluding value of escrowed SNX
     * @param totalSupply: xSNX.totalSupply()
     * @param snxBalanceOwned: non-escrowed SNX balance
     * @param contractDebtValue: sUSD debt in USD terms
     */
    function calculateRedeemTokenPrice(
        uint256 totalSupply,
        uint256 snxBalanceOwned,
        uint256 contractDebtValue
    ) public view returns (uint256 pricePerToken) {
        // SNX won't actually be sold (burns are only distributed in available ETH) but
        // this is a proxy for the return value of SNX that would be sold
        uint256 weiPerOneSnx = getWeiPerOneSnxOnRedeem();

        uint256 debtValueInWei = calculateDebtValueInWei(contractDebtValue);
        pricePerToken = calculateNetAssetValueOnRedeem(
            weiPerOneSnx,
            snxBalanceOwned,
            debtValueInWei
        )
            .mul(DEC_18)
            .div(totalSupply);
    }

    /* ========================================================================================= */
    /*                                          Set                                              */
    /* ========================================================================================= */

    /*
     * @dev Balance of underlying asset "active" in Set (e.g., WETH or USDC)
     */
    function getActiveSetAssetBalance() public view returns (uint256) {
        return
            IERC20(getAssetCurrentlyActiveInSet()).balanceOf(xSNXAdminInstance);
    }

    /*
     * @dev Calculates quantity of Set Token equivalent to quantity of underlying asset token
     * @notice rebalancingSetQuantity return value is reduced slightly to ensure successful execution
     * @param componentQuantity: balance of underlying Set asset, e.g., WETH
     */
    function calculateSetQuantity(uint256 componentQuantity)
        public
        view
        returns (uint256 rebalancingSetQuantity)
    {
        uint256 baseSetNaturalUnit = getBaseSetNaturalUnit();
        uint256 baseSetComponentUnits = getBaseSetComponentUnits();
        uint256 baseSetIssuable = componentQuantity.mul(baseSetNaturalUnit).div(
            baseSetComponentUnits
        );

        uint256 rebalancingSetNaturalUnit = getSetNaturalUnit();
        uint256 unitShares = getSetUnitShares();
        rebalancingSetQuantity = baseSetIssuable
            .mul(rebalancingSetNaturalUnit)
            .div(unitShares)
            .mul(99) // ensure sufficient balance in underlying asset
            .div(100)
            .div(rebalancingSetNaturalUnit)
            .mul(rebalancingSetNaturalUnit);
    }

    /*
     * @dev Calculates mintable quantity of Set Token given asset holdings
     */
    function calculateSetIssuanceQuantity()
        public
        view
        returns (uint256 rebalancingSetIssuable)
    {
        uint256 componentQuantity = getActiveSetAssetBalance();
        rebalancingSetIssuable = calculateSetQuantity(componentQuantity);
    }

    /*
     * @dev Calculates Set token to sell given sUSD burn requirements
     * @param totalSusdToBurn: sUSD to burn to fix ratio or unlock staked SNX
     */
    function calculateSetRedemptionQuantity(uint256 totalSusdToBurn)
        public
        view
        returns (uint256 rebalancingSetRedeemable)
    {
        address currentSetAsset = getAssetCurrentlyActiveInSet();

        bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();
        uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);

        // expectedSetAssetRate = amount of current set asset needed to redeem for 1 sUSD
        uint256 expectedSetAssetRate = DEC_18.mul(DEC_18).div(synthUsd);

        uint256 setAssetCollateralToSell = expectedSetAssetRate
            .mul(totalSusdToBurn)
            .div(DEC_18)
            .mul(103) // err on the high side
            .div(PERCENT);

        uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
        setAssetCollateralToSell = setAssetCollateralToSell.mul(decimals).div(
            DEC_18
        );

        rebalancingSetRedeemable = calculateSetQuantity(
            setAssetCollateralToSell
        );
    }

    /*
     * @dev Calculates value of a single 1e18 Set unit in ETH terms
     */
    function calculateEthValueOfOneSetUnit()
        internal
        view
        returns (uint256 ethValue)
    {
        uint256 unitShares = getSetUnitShares();
        uint256 rebalancingSetNaturalUnit = getSetNaturalUnit();
        uint256 baseSetRequired = DEC_18.mul(unitShares).div(
            rebalancingSetNaturalUnit
        );

        uint256 unitsOfUnderlying = getBaseSetComponentUnits();
        uint256 baseSetNaturalUnit = getBaseSetNaturalUnit();
        uint256 componentRequired = baseSetRequired.mul(unitsOfUnderlying).div(
            baseSetNaturalUnit
        );

        address currentSetAsset = getAssetCurrentlyActiveInSet();
        uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
        componentRequired = componentRequired.mul(DEC_18).div(decimals);

        bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();

        uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);
        uint256 ethUsd = getSynthPrice(seth);
        ethValue = componentRequired.mul(synthUsd).div(ethUsd);
    }

    /*
     * @dev Calculates value of Set Holdings in ETH terms
     */
    function getSetHoldingsValueInWei()
        public
        view
        returns (uint256 setValInWei)
    {
        uint256 setCollateralTokens = getSetCollateralTokens();
        bytes32 synthSymbol = getActiveAssetSynthSymbol();
        address currentSetAsset = getAssetCurrentlyActiveInSet();

        uint256 synthUsd = getSynthPrice(synthSymbol);
        uint256 ethUsd = getSynthPrice(seth);

        uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
        setCollateralTokens = setCollateralTokens.mul(DEC_18).div(decimals);
        setValInWei = setCollateralTokens.mul(synthUsd).div(ethUsd);
    }

    function getBaseSetNaturalUnit() internal view returns (uint256) {
        return getCurrentCollateralSet().naturalUnit();
    }

    /*
     * @dev Outputs current active Set asset
     * @notice xSNX contracts complex only compatible with Sets that hold a single asset at a time
     */
    function getAssetCurrentlyActiveInSet() public view returns (address) {
        address[] memory currentAllocation = getCurrentCollateralSet()
            .getComponents();
        return currentAllocation[0];
    }

    function getCurrentCollateralSet()
        internal
        view
        returns (ISetAssetBaseCollateral)
    {
        return ISetAssetBaseCollateral(getCurrentSet());
    }

    function getCurrentSet() internal view returns (address) {
        return ISetToken(setAddress).currentSet();
    }

    /*
     * @dev Returns the number of underlying tokens in the current Set asset
     * e.g., the contract's Set holdings are collateralized by 10.4 WETH
     */
    function getSetCollateralTokens() internal view returns (uint256) {
        return
            getSetBalanceCollateral().mul(getBaseSetComponentUnits()).div(
                getBaseSetNaturalUnit()
            );
    }

    function getSetBalanceCollateral() internal view returns (uint256) {
        uint256 unitShares = getSetUnitShares();
        uint256 naturalUnit = getSetNaturalUnit();
        return getContractSetBalance().mul(unitShares).div(naturalUnit);
    }

    function getSetUnitShares() internal view returns (uint256) {
        return ISetToken(setAddress).unitShares();
    }

    function getSetNaturalUnit() internal view returns (uint256) {
        return ISetToken(setAddress).naturalUnit();
    }

    function getContractSetBalance() internal view returns (uint256) {
        return IERC20(setAddress).balanceOf(xSNXAdminInstance);
    }

    function getBaseSetComponentUnits() internal view returns (uint256) {
        return ISetAssetBaseCollateral(getCurrentSet()).getUnits()[0];
    }

    /* ========================================================================================= */
    /*                                         Synthetix	                                     */
    /* ========================================================================================= */

    function getSusdBalance() public view returns (uint256) {
        return IERC20(susdAddress).balanceOf(xSNXAdminInstance);
    }

    function getSnxBalance() public view returns (uint256) {
        return getSnxBalanceOwned().add(getSnxBalanceEscrowed());
    }

    function getSnxBalanceOwned() internal view returns (uint256) {
        return
            IERC20(addressResolver.getAddress(synthetixName)).balanceOf(
                xSNXAdminInstance
            );
    }

    function getSnxBalanceEscrowed() internal view returns (uint256) {
        return
            IRewardEscrow(addressResolver.getAddress(rewardEscrowName))
                .balanceOf(xSNXAdminInstance);
    }

    function getContractEscrowedSnxValue() internal view returns (uint256) {
        return getSnxBalanceEscrowed().mul(getSnxPrice()).div(DEC_18);
    }

    function getContractOwnedSnxValue() internal view returns (uint256) {
        return getSnxBalanceOwned().mul(getSnxPrice()).div(DEC_18);
    }

    function getSnxPrice() internal view returns (uint256) {
        (uint256 rate, uint256 time) = IExchangeRates(
            addressResolver.getAddress(exchangeRatesName)
        )
            .rateAndUpdatedTime(snx);
        require(time.add(RATE_STALE_TIME) > block.timestamp, "Rate stale");
        return rate;
    }

    function getSynthPrice(bytes32 synth) internal view returns (uint256) {
        (uint256 rate, uint256 time) = IExchangeRates(
            addressResolver.getAddress(exchangeRatesName)
        )
            .rateAndUpdatedTime(synth);
        if (synth != susd) {
            require(time.add(RATE_STALE_TIME) > block.timestamp, "Rate stale");
        }
        return rate;
    }

    /*
     * @dev Converts sUSD debt value into ETH terms
     * @param debtValue: sUSD-denominated debt value
     */
    function calculateDebtValueInWei(uint256 debtValue)
        internal
        view
        returns (uint256 debtBalanceInWei)
    {
        uint256 ethUsd = getSynthPrice(seth);
        debtBalanceInWei = debtValue.mul(DEC_18).div(ethUsd);
    }

    function getContractDebtValue() internal view returns (uint256) {
        return
            ISynthetix(addressResolver.getAddress(synthetixName)).debtBalanceOf(
                xSNXAdminInstance,
                susd
            );
    }

    /*
     * @notice Returns inverse of target C-RATIO
     */
    function getIssuanceRatio() internal view returns (uint256) {
        return
            ISystemSettings(addressResolver.getAddress(systemSettingsName))
                .issuanceRatio();
    }

    /*
     * @notice Returns NAV contribution of SNX holdings in USD terms
     */
    function getContractSnxValue() internal view returns (uint256) {
        return getSnxBalance().mul(getSnxPrice()).div(DEC_18);
    }

    /* ========================================================================================= */
    /*                                       Burning sUSD                                        */
    /* ========================================================================================= */

    /*
     * @dev Calculates sUSD to burn to restore C-RATIO
     * @param snxValueHeld: USD value of SNX
     * @param contractDebtValue: USD value of sUSD debt
     * @param issuanceRatio: Synthetix C-RATIO requirement
     */
    function calculateSusdToBurnToFixRatio(
        uint256 snxValueHeld,
        uint256 contractDebtValue,
        uint256 issuanceRatio
    ) internal pure returns (uint256) {
        uint256 subtractor = issuanceRatio.mul(snxValueHeld).div(DEC_18);

        if (subtractor > contractDebtValue) return 0;
        return contractDebtValue.sub(subtractor);
    }

    /*
     * @dev Calculates sUSD to burn to restore C-RATIO
     */
    function calculateSusdToBurnToFixRatioExternal()
        public
        view
        returns (uint256)
    {
        uint256 snxValueHeld = getContractSnxValue();
        uint256 debtValue = getContractDebtValue();
        uint256 issuanceRatio = getIssuanceRatio();
        return
            calculateSusdToBurnToFixRatio(
                snxValueHeld,
                debtValue,
                issuanceRatio
            );
    }

    /*
     * @dev Calculates sUSD to burn to eclipse value of escrowed SNX
     * @notice Synthetix system requires escrowed SNX to be "unlocked" first
     * @param issuanceRatio: Synthetix C-RATIO requirement
     */
    function calculateSusdToBurnToEclipseEscrowed(uint256 issuanceRatio)
        public
        view
        returns (uint256)
    {
        uint256 escrowedSnxValue = getContractEscrowedSnxValue();
        if (escrowedSnxValue == 0) return 0;

        return escrowedSnxValue.mul(issuanceRatio).div(DEC_18);
    }

    /*
     * @dev Helper function to calculate sUSD burn required for a potential redemption
     * @param tokensToRedeem: potential tokens to burn
     * @param totalSupply: xSNX.totalSupply()
     * @param contractDebtValue: sUSD debt value
     * @param issuanceRatio: Synthetix C-RATIO requirement
     */
    function calculateSusdToBurnForRedemption(
        uint256 tokensToRedeem,
        uint256 totalSupply,
        uint256 contractDebtValue,
        uint256 issuanceRatio
    ) public view returns (uint256 susdToBurn) {
        uint256 nonEscrowedSnxValue = getContractOwnedSnxValue();
        uint256 lockedSnxValue = contractDebtValue.mul(DEC_18).div(
            issuanceRatio
        );
        uint256 valueOfSnxToSell = nonEscrowedSnxValue.mul(tokensToRedeem).div(
            totalSupply
        );
        susdToBurn = (
            lockedSnxValue.add(valueOfSnxToSell).sub(nonEscrowedSnxValue)
        )
            .mul(issuanceRatio)
            .div(DEC_18);
    }

    /* ========================================================================================= */
    /*                                        Rebalances                                         */
    /* ========================================================================================= */

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
     */
    function calculateAssetChangesForRebalanceToHedge()
        internal
        view
        returns (uint256 totalSusdToBurn, uint256 snxToSell)
    {
        uint256 snxValueHeld = getContractSnxValue();
        uint256 debtValueInUsd = getContractDebtValue();
        uint256 issuanceRatio = getIssuanceRatio();

        uint256 susdToBurnToFixRatio = calculateSusdToBurnToFixRatio(
            snxValueHeld,
            debtValueInUsd,
            issuanceRatio
        );


            uint256 susdToBurnToEclipseEscrowed
         = calculateSusdToBurnToEclipseEscrowed(issuanceRatio);

        uint256 hedgeAssetsValueInUsd = calculateHedgeAssetsValueInUsd();
        uint256 valueToUnlockInUsd = debtValueInUsd.sub(hedgeAssetsValueInUsd);

        uint256 susdToBurnToUnlockTransfer = valueToUnlockInUsd
            .mul(issuanceRatio)
            .div(DEC_18);

        totalSusdToBurn = (
            susdToBurnToFixRatio.add(susdToBurnToEclipseEscrowed).add(
                susdToBurnToUnlockTransfer
            )
        );
        snxToSell = valueToUnlockInUsd.mul(DEC_18).div(getSnxPrice());
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx()
     */
    function calculateAssetChangesForRebalanceToSnx()
        public
        view
        returns (uint256 setToSell)
    {
        (
            uint256 debtValueInWei,
            uint256 hedgeAssetsBalance
        ) = getRebalanceUtils();
        uint256 setValueToSell = hedgeAssetsBalance.sub(debtValueInWei);
        uint256 ethValueOfOneSet = calculateEthValueOfOneSetUnit();
        setToSell = setValueToSell.mul(DEC_18).div(ethValueOfOneSet);

        // Set quantity must be multiple of natural unit
        uint256 naturalUnit = getSetNaturalUnit();
        setToSell = setToSell.div(naturalUnit).mul(naturalUnit);
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx()
     */
    function getRebalanceTowardsSnxUtils()
        public
        view
        returns (uint256 setToSell, address activeAsset)
    {
        setToSell = calculateAssetChangesForRebalanceToSnx();
        activeAsset = getAssetCurrentlyActiveInSet();
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx(), xSNXAdmin.rebalanceTowardsHedge()
     * @dev Denominated in ETH terms
     */
    function getRebalanceUtils()
        public
        view
        returns (uint256 debtValueInWei, uint256 hedgeAssetsBalance)
    {
        uint256 setHoldingsInWei = getSetHoldingsValueInWei();
        uint256 ethBalance = getEthBalance();

        uint256 debtValue = getContractDebtValue();
        debtValueInWei = calculateDebtValueInWei(debtValue);
        hedgeAssetsBalance = setHoldingsInWei.add(ethBalance);
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
     * @dev Denominated in USD terms
     */
    function calculateHedgeAssetsValueInUsd()
        internal
        view
        returns (uint256 hedgeAssetsValueInUsd)
    {
        address currentSetAsset = getAssetCurrentlyActiveInSet();
        uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
        uint256 setCollateralTokens = getSetCollateralTokens();
        setCollateralTokens = setCollateralTokens.mul(DEC_18).div(decimals);

        bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();

        uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);
        uint256 setValueUsd = setCollateralTokens.mul(synthUsd).div(DEC_18);

        uint256 ethBalance = getEthBalance();
        uint256 ethUsd = getSynthPrice(seth);
        uint256 ethValueUsd = ethBalance.mul(ethUsd).div(DEC_18);

        hedgeAssetsValueInUsd = setValueUsd.add(ethValueUsd);
    }

    /*
     * @dev Helper function to determine whether xSNXAdmin.rebalanceTowardsSnx() is required
     */
    function isRebalanceTowardsSnxRequired() public view returns (bool) {
        (
            uint256 debtValueInWei,
            uint256 hedgeAssetsBalance
        ) = getRebalanceUtils();

        if (
            debtValueInWei.mul(REBALANCE_THRESHOLD).div(PERCENT) <
            hedgeAssetsBalance
        ) {
            return true;
        }

        return false;
    }

    /*
     * @dev Helper function to determine whether xSNXAdmin.rebalanceTowardsHedge() is required
     */
    function isRebalanceTowardsHedgeRequired() public view returns (bool) {
        (
            uint256 debtValueInWei,
            uint256 hedgeAssetsBalance
        ) = getRebalanceUtils();

        if (
            hedgeAssetsBalance.mul(REBALANCE_THRESHOLD).div(PERCENT) <
            debtValueInWei
        ) {
            return true;
        }

        return false;
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
     * @notice Will fail if !isRebalanceTowardsHedgeRequired()
     */
    function getRebalanceTowardsHedgeUtils()
        public
        view
        returns (
            uint256,
            uint256,
            address
        )
    {
        (
            uint256 totalSusdToBurn,
            uint256 snxToSell
        ) = calculateAssetChangesForRebalanceToHedge();
        address activeAsset = getAssetCurrentlyActiveInSet();
        return (totalSusdToBurn, snxToSell, activeAsset);
    }

    /*
     * @dev Helper for `hedge` function
     * @dev Determines share of sUSD to allocate to ETH
     * @dev Implicitly determines Set allocation as well
     * @param susdBal: sUSD balance post minting
     */
    function getEthAllocationOnHedge(uint256 susdBal)
        public
        view
        returns (uint256 ethAllocation)
    {
        uint256 ethUsd = getSynthPrice(seth);

        uint256 setHoldingsInUsd = getSetHoldingsValueInWei().mul(ethUsd).div(
            DEC_18
        );
        uint256 ethBalInUsd = getEthBalance().mul(ethUsd).div(DEC_18);
        uint256 hedgeAssets = setHoldingsInUsd.add(ethBalInUsd);

        if (ethBalInUsd.mul(ETH_TARGET) >= hedgeAssets.add(susdBal)) {
            // full bal directed toward Set
            // eth allocation is 0
        } else if ((ethBalInUsd.add(susdBal)).mul(ETH_TARGET) < hedgeAssets) {
            // full bal directed toward Eth
            ethAllocation = susdBal;
        } else {
            // fractionate allocation
            ethAllocation = ((hedgeAssets.add(susdBal)).div(ETH_TARGET)).sub(
                ethBalInUsd
            );
        }
    }

    /*
     * @dev Helper function to facilitate xSNXAdmin.rebalanceSetToEth()
     */
    function calculateSetToSellForRebalanceSetToEth()
        public
        view
        returns (uint256 setQuantityToSell)
    {
        uint256 setHoldingsInWei = getSetHoldingsValueInWei();
        uint256 ethBal = getEthBalance();
        uint256 hedgeAssets = setHoldingsInWei.add(ethBal);
        require(
            ethBal.mul(ETH_TARGET) < hedgeAssets,
            "Rebalance not necessary"
        );

        uint256 ethToAdd = ((hedgeAssets.div(ETH_TARGET)).sub(ethBal));
        setQuantityToSell = getContractSetBalance().mul(ethToAdd).div(
            setHoldingsInWei
        );

        uint256 naturalUnit = getSetNaturalUnit();
        setQuantityToSell = setQuantityToSell.div(naturalUnit).mul(naturalUnit);
    }

    /* ========================================================================================= */
    /*                                     Address Setters                                       */
    /* ========================================================================================= */

    function setAdminInstanceAddress(address _xSNXAdminInstance)
        public
        onlyOwner
    {
        if (xSNXAdminInstance == address(0)) {
            xSNXAdminInstance = _xSNXAdminInstance;
        }
    }

    function setCurve(
        address curvePoolAddress,
        int128 _usdcIndex,
        int128 _susdIndex
    ) public onlyOwner {
        if (address(curveFi) == address(0)) {
            // if initial set on deployment, immediately activate Curve address
            curveFi = ICurveFi(curvePoolAddress);
            nextCurveAddress = curvePoolAddress;
        } else {
            // if updating Curve address (i.e., not initial setting of address on deployment),
            // store nextCurveAddress but don't activate until addressValidator has confirmed
            nextCurveAddress = curvePoolAddress;
        }
        usdcIndex = _usdcIndex;
        susdIndex = _susdIndex;
    }

    /* ========================================================================================= */
    /*                                   		 Utils           		                         */
    /* ========================================================================================= */

    // admin on deployment approve [snx, susd, setComponentA, setComponentB]
    function approveKyber(address tokenAddress) public onlyOwner {
        IERC20(tokenAddress).approve(address(kyberNetworkProxy), MAX_UINT);
    }

    // admin on deployment approve [susd, usdc]
    function approveCurve(address tokenAddress) public onlyOwner {
        IERC20(tokenAddress).approve(address(curveFi), MAX_UINT);
    }

    function confirmCurveAddress(address _nextCurveAddress) public {
        require(msg.sender == addressValidator, "Incorrect caller");
        require(nextCurveAddress == _nextCurveAddress, "Addresses don't match");
        curveFi = ICurveFi(nextCurveAddress);
    }

    function() external payable {}
}

// File: contracts/helpers/Pausable.sol

pragma solidity ^0.5.15;


/* Adapted from OpenZeppelin */
contract Pausable is Initializable {
    /**
     * @dev Emitted when the pause is triggered by a pauser.
     */
    event Paused();

    /**
     * @dev Emitted when the pause is lifted by a pauser.
     */
    event Unpaused();

    bool private _paused;
    address public pauser;

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer.
     */
    constructor () internal {
        _paused = false;
        pauser = msg.sender;
    }

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer. This function is called when the contract is used in a upgradeable context.
     */
    function initialize(address sender) public initializer {
        _paused = false;
        pauser = sender;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by a pauser to pause, triggers stopped state.
     */
    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused();
    }

    /**
     * @dev Called by a pauser to unpause, returns to normal state.
     */
    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused();
    }

    modifier onlyPauser {
        require(msg.sender == pauser, "Don't have rights");
        _;
    }
}

// File: contracts/interface/IxSNXAdmin.sol

pragma solidity 0.5.15;

contract IxSNXAdmin {
    function sendEthOnRedemption(uint valueToRedeem) external;
}

// File: contracts/xSNX.sol

pragma solidity 0.5.15;










contract xSNX is ERC20, ERC20Detailed, Pausable, Ownable {
    TradeAccounting private tradeAccounting;
    IKyberNetworkProxy private kyberNetworkProxy;

    address xsnxAdmin;
    address snxAddress;
    address susdAddress;

    uint256 public withdrawableEthFees;

    function initialize(
        address payable _tradeAccountingAddress,
        address _kyberProxyAddress,
        address _snxAddress,
        address _susdAddress,
        address _xsnxAdmin,
        address _ownerAddress,
        uint256 _mintFeeDivisor,
        uint256 _burnFeeDivisor,
        uint256 _claimFeeDivisor
    ) public initializer {
        Ownable.initialize(_ownerAddress);
        ERC20Detailed.initialize("xSNX", "xSNXa", 18);
        Pausable.initialize(_ownerAddress);

        tradeAccounting = TradeAccounting(_tradeAccountingAddress);
        kyberNetworkProxy = IKyberNetworkProxy(_kyberProxyAddress);
        snxAddress = _snxAddress;
        susdAddress = _susdAddress;
        xsnxAdmin = _xsnxAdmin;

        _setFeeDivisors(_mintFeeDivisor, _burnFeeDivisor, _claimFeeDivisor);
    }

    event Mint(
        address indexed user,
        uint256 timestamp,
        uint256 valueSent,
        uint256 mintAmount,
        bool mintWithEth
    );
    event Burn(
        address indexed user,
        uint256 timestamp,
        uint256 burnAmount,
        uint256 valueToSend
    );
    event WithdrawFees(
        uint256 ethAmount,
        uint256 susdAmount,
        uint256 snxAmount
    );

    struct FeeDivisors {
        uint256 mintFee;
        uint256 burnFee;
        uint256 claimFee;
    }

    FeeDivisors public feeDivisors;

    /*
     * @notice Mint new xSNX tokens from the contract by sending ETH
     * @dev Exchanges ETH for SNX
     * @dev Min rate ETH/SNX sourced from Kyber in JS
     * @dev: Calculates overall fund NAV in ETH terms, using ETH/SNX implicit conversion rate
     * or ETH/SNX price (via SNX oracle) in case of allocateToEth
     * @dev: Mints/distributes new xSNX tokens based on contribution to NAV
     * @param: minRate: kyberProxy.getExpectedRate eth=>snx
     */
    function mint(uint256 minRate) external payable whenNotPaused {
        require(msg.value > 0, "Must send ETH");

        uint256 fee = calculateFee(msg.value, feeDivisors.mintFee);
        uint256 ethContribution = msg.value.sub(fee);
        uint256 snxBalanceBefore = tradeAccounting.getSnxBalance();

        uint256 totalSupply = totalSupply();
        (bool allocateToEth, uint256 nonSnxAssetValue) = tradeAccounting
            .getMintWithEthUtils(totalSupply);

        if (!allocateToEth) {
            uint256 snxAcquired = kyberNetworkProxy.swapEtherToToken.value(
                ethContribution
            )(ERC20(snxAddress), minRate);
            require(
                IERC20(snxAddress).transfer(xsnxAdmin, snxAcquired),
                "Transfer failed"
            );
        } else {
            (bool success, ) = xsnxAdmin.call.value(ethContribution)("");
            require(success, "Transfer failed");
        }

        uint256 mintAmount = tradeAccounting.calculateTokensToMintWithEth(
            snxBalanceBefore,
            ethContribution,
            nonSnxAssetValue,
            totalSupply,
            allocateToEth
        );

        emit Mint(msg.sender, block.timestamp, msg.value, mintAmount, true);
        return super._mint(msg.sender, mintAmount);
    }

    /*
     * @notice Mint new xSNX tokens from the contract by sending SNX
     * @notice Won't run without ERC20 approval
     * @dev: Calculates overall fund NAV in ETH terms, using ETH/SNX price (via SNX oracle)
     * @dev: Mints/distributes new xSNX tokens based on contribution to NAV
     * @param: snxAmount: SNX to contribute
     */
    function mintWithSnx(uint256 snxAmount) external whenNotPaused {
        require(snxAmount > 0, "Must send SNX");
        uint256 snxBalanceBefore = tradeAccounting.getSnxBalance();

        uint256 fee = calculateFee(snxAmount, feeDivisors.mintFee);
        uint256 snxContribution = snxAmount.sub(fee);

        require(
            IERC20(snxAddress).transferFrom(msg.sender, address(this), fee),
            "Transfer failed"
        );
        require(
            IERC20(snxAddress).transferFrom(
                msg.sender,
                xsnxAdmin,
                snxContribution
            ),
            "Transfer failed"
        );

        uint256 mintAmount = tradeAccounting.calculateTokensToMintWithSnx(
            snxBalanceBefore,
            snxContribution,
            totalSupply()
        );

        emit Mint(
            msg.sender,
            block.timestamp,
            snxContribution,
            mintAmount,
            false
        );
        return super._mint(msg.sender, mintAmount);
    }

    /*
     * @notice Redeems and burns xSNX tokens and sends ETH to user
     * @dev Checks if ETH reserve is sufficient to settle redeem obligation
     * @dev Will only redeem if ETH reserve is sufficient
     * @param tokensToRedeem
     */
    function burn(uint256 tokensToRedeem) external {
        require(tokensToRedeem > 0, "Must burn tokens");

        uint256 valueToRedeem = tradeAccounting.calculateRedemptionValue(
            totalSupply(),
            tokensToRedeem
        );

        require(
            tradeAccounting.getEthBalance() >= valueToRedeem,
            "Redeem amount exceeds available liquidity"
        );

        IxSNXAdmin(xsnxAdmin).sendEthOnRedemption(valueToRedeem);
        uint256 valueToSend = valueToRedeem.sub(
            calculateFee(valueToRedeem, feeDivisors.burnFee)
        );
        super._burn(msg.sender, tokensToRedeem);
        emit Burn(msg.sender, block.timestamp, tokensToRedeem, valueToSend);

        (bool success, ) = msg.sender.call.value(valueToSend)("");
        require(success, "Burn transfer failed");
    }

    function calculateFee(uint256 _value, uint256 _feeDivisor)
        internal
        pure
        returns (uint256 fee)
    {
        if (_feeDivisor > 0) {
            fee = _value.div(_feeDivisor);
        }
    }

    /*
     * @notice Inverse of fee i.e., a fee divisor of 100 == 1%
     * @notice Three fee types
     * @dev Mint fee 0 or <= 2%
     * @dev Burn fee 0 or <= 1%
     * @dev Claim fee 0 <= 4%
     */
    function setFeeDivisors(
        uint256 mintFeeDivisor,
        uint256 burnFeeDivisor,
        uint256 claimFeeDivisor
    ) public onlyOwner {
        _setFeeDivisors(mintFeeDivisor, burnFeeDivisor, claimFeeDivisor);
    }

    function _setFeeDivisors(
        uint256 _mintFeeDivisor,
        uint256 _burnFeeDivisor,
        uint256 _claimFeeDivisor
    ) private {
        require(_mintFeeDivisor == 0 || _mintFeeDivisor >= 50, "Invalid fee");
        require(_burnFeeDivisor == 0 || _burnFeeDivisor >= 100, "Invalid fee");
        require(_claimFeeDivisor >= 25, "Invalid fee");
        feeDivisors.mintFee = _mintFeeDivisor;
        feeDivisors.burnFee = _burnFeeDivisor;
        feeDivisors.claimFee = _claimFeeDivisor;
    }

    /*
     * @notice Withdraws ETH, sUSD and SNX fees to owner address
     */
    function withdrawFees() public onlyOwner {
        uint256 ethFeesToWithdraw = address(this).balance;
        uint256 susdFeesToWithdraw = IERC20(susdAddress).balanceOf(
            address(this)
        );
        uint256 snxFeesToWithdraw = IERC20(snxAddress).balanceOf(address(this));

        (bool success, ) = msg.sender.call.value(ethFeesToWithdraw)("");
        require(success, "Transfer failed");

        IERC20(susdAddress).transfer(msg.sender, susdFeesToWithdraw);
        IERC20(snxAddress).transfer(msg.sender, snxFeesToWithdraw);

        emit WithdrawFees(
            ethFeesToWithdraw,
            susdFeesToWithdraw,
            snxFeesToWithdraw
        );
    }

    /*
     * @notice Emergency function in case of errant transfer of
     * xSNX token directly to contract
     */
    function withdrawNativeToken() public onlyOwner {
        uint256 tokenBal = balanceOf(address(this));
        if (tokenBal > 0) {
            IERC20(address(this)).transfer(msg.sender, tokenBal);
        }
    }

    /*
     * @dev Helper function for xSNXAdmin to calculate and
     * transfer claim fees
     */
    function getClaimFeeDivisor() public view returns (uint256) {
        return feeDivisors.claimFee;
    }

    function() external payable {
        require(msg.sender == xsnxAdmin, "Invalid send");
    }
}

Contract Security Audit

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Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"burnAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"valueToSend","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"valueSent","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"mintAmount","type":"uint256"},{"indexed":false,"internalType":"bool","name":"mintWithEth","type":"bool"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"ethAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"susdAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"snxAmount","type":"uint256"}],"name":"WithdrawFees","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"tokensToRedeem","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"feeDivisors","outputs":[{"internalType":"uint256","name":"mintFee","type":"uint256"},{"internalType":"uint256","name":"burnFee","type":"uint256"},{"internalType":"uint256","name":"claimFee","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getClaimFeeDivisor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address payable","name":"_tradeAccountingAddress","type":"address"},{"internalType":"address","name":"_kyberProxyAddress","type":"address"},{"internalType":"address","name":"_snxAddress","type":"address"},{"internalType":"address","name":"_susdAddress","type":"address"},{"internalType":"address","name":"_xsnxAdmin","type":"address"},{"internalType":"address","name":"_ownerAddress","type":"address"},{"internalType":"uint256","name":"_mintFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"_burnFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"_claimFeeDivisor","type":"uint256"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"minRate","type":"uint256"}],"name":"mint","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"snxAmount","type":"uint256"}],"name":"mintWithSnx","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pauser","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"mintFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"burnFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"claimFeeDivisor","type":"uint256"}],"name":"setFeeDivisors","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"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawFees","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawNativeToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"withdrawableEthFees","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

Contract Creation Code

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Swarm Source

bzzr://940916da5f1e9262e013f08512ac5b1de7b172a0e4e66a8267f6245981a46b0a

Block		Transaction	Difficulty	Gas Used	Reward

View All Blocks Produced

Block		Uncle Number	Difficulty	Gas Used	Reward

View All Uncles

Validator Index	Block		Amount

View All Withdrawals

Transaction Hash	Block		Value	Eth2 PubKey	Valid

View All Deposits

Multichain Portfolio | 26 Chains

Display all chains •

Last updated: less than 1 sec ago

Chain	Token	Portfolio %	Price	Amount	Value

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.

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