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0xb69F9Cd6c9Dfe547Ff83c1eB153A8A0Abd7adcD9

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ParaSwap: Deployer 2 at txn 0xe68312f67cf4ec749441e18c8669130c42462e518c9f7b385ab4f9a1b4d053ed

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0xe68312f67cf4ec749441e18c8669130c42462e518c9f7b385ab4f9a1b4d053ed	11707760	2021-01-22 21:33:14	1307 days ago	1611351194	ParaSwap V3		Contract Creation	0 ETH$0.00

Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x251C9Bbc...3E8776981
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:

TokenTransferProxy

Compiler Version

v0.7.5+commit.eb77ed08

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion, None license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2021-01-22
*/

/**
 *Submitted for verification at Etherscan.io on 2021-01-21
*/

// File: openzeppelin-solidity/contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

// File: openzeppelin-solidity/contracts/GSN/Context.sol



pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol



pragma solidity >=0.6.0 <0.8.0;




/**
 * @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 {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

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

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

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

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

        _beforeTokenTransfer(account, address(0), amount);

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

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: openzeppelin-solidity/contracts/access/Ownable.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @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(_owner == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: openzeppelin-solidity/contracts/utils/Address.sol



pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: original_contracts/IWhitelisted.sol

pragma solidity 0.7.5;


interface IWhitelisted {

    function hasRole(
        bytes32 role,
        address account
    )
        external
        view
        returns (bool);

    function WHITELISTED_ROLE() external view returns(bytes32);
}

// File: original_contracts/lib/IExchange.sol

pragma solidity 0.7.5;



/**
* @dev This interface should be implemented by all exchanges which needs to integrate with the paraswap protocol
*/
interface IExchange {

    /**
   * @dev The function which performs the swap on an exchange.
   * Exchange needs to implement this method in order to support swapping of tokens through it
   * @param fromToken Address of the source token
   * @param toToken Address of the destination token
   * @param fromAmount Amount of source tokens to be swapped
   * @param toAmount Minimum destination token amount expected out of this swap
   * @param exchange Internal exchange or factory contract address for the exchange. For example Registry address for the Uniswap
   * @param payload Any exchange specific data which is required can be passed in this argument in encoded format which
   * will be decoded by the exchange. Each exchange will publish it's own decoding/encoding mechanism
   */
    function swap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address exchange,
        bytes calldata payload) external payable returns (uint256);

  /**
   * @dev The function which performs the swap on an exchange.
   * Exchange needs to implement this method in order to support swapping of tokens through it
   * @param fromToken Address of the source token
   * @param toToken Address of the destination token
   * @param fromAmount Max Amount of source tokens to be swapped
   * @param toAmount Destination token amount expected out of this swap
   * @param exchange Internal exchange or factory contract address for the exchange. For example Registry address for the Uniswap
   * @param payload Any exchange specific data which is required can be passed in this argument in encoded format which
   * will be decoded by the exchange. Each exchange will publish it's own decoding/encoding mechanism
   */
    function buy(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address exchange,
        bytes calldata payload) external payable returns (uint256);

    /**
   * @dev This function is used to perform onChainSwap. It build all the parameters onchain. Basically the information
   * encoded in payload param of swap will calculated in this case
   * Exchange needs to implement this method in order to support swapping of tokens through it
   * @param fromToken Address of the source token
   * @param toToken Address of the destination token
   * @param fromAmount Amount of source tokens to be swapped
   * @param toAmount Minimum destination token amount expected out of this swap
   */
    function onChainSwap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount
    ) external payable returns (uint256);
}

// File: openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol



pragma solidity >=0.6.0 <0.8.0;




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

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

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

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

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

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

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

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

// File: original_contracts/ITokenTransferProxy.sol

pragma solidity 0.7.5;


interface ITokenTransferProxy {

    function transferFrom(
        address token,
        address from,
        address to,
        uint256 amount
    )
        external;

    function freeGSTTokens(uint256 tokensToFree) external;
}

// File: original_contracts/lib/Utils.sol

pragma solidity 0.7.5;







library Utils {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    address constant ETH_ADDRESS = address(
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
    );

    uint256 constant MAX_UINT = 2 ** 256 - 1;

    /**
   * @param fromToken Address of the source token
   * @param toToken Address of the destination token
   * @param fromAmount Amount of source tokens to be swapped
   * @param toAmount Minimum destination token amount expected out of this swap
   * @param expectedAmount Expected amount of destination tokens without slippage
   * @param beneficiary Beneficiary address
   * 0 then 100% will be transferred to beneficiary. Pass 10000 for 100%
   * @param referrer referral id
   * @param path Route to be taken for this swap to take place

   */
    struct SellData {
        IERC20 fromToken;
        IERC20 toToken;
        uint256 fromAmount;
        uint256 toAmount;
        uint256 expectedAmount;
        address payable beneficiary;
        string referrer;
        Utils.Path[] path;

    }

    struct BuyData {
        IERC20 fromToken;
        IERC20 toToken;
        uint256 fromAmount;
        uint256 toAmount;
        address payable beneficiary;
        string referrer;
        Utils.BuyRoute[] route;
    }

    struct Route {
        address payable exchange;
        address targetExchange;
        uint percent;
        bytes payload;
        uint256 networkFee;//Network fee is associated with 0xv3 trades
    }

    struct Path {
        address to;
        uint256 totalNetworkFee;//Network fee is associated with 0xv3 trades
        Route[] routes;
    }

    struct BuyRoute {
        address payable exchange;
        address targetExchange;
        uint256 fromAmount;
        uint256 toAmount;
        bytes payload;
        uint256 networkFee;//Network fee is associated with 0xv3 trades
    }

    function ethAddress() internal pure returns (address) {return ETH_ADDRESS;}

    function maxUint() internal pure returns (uint256) {return MAX_UINT;}

    function approve(
        address addressToApprove,
        address token,
        uint256 amount
    ) internal {
        if (token != ETH_ADDRESS) {
            IERC20 _token = IERC20(token);

            uint allowance = _token.allowance(address(this), addressToApprove);

            if (allowance < amount) {
                _token.safeApprove(addressToApprove, 0);
                _token.safeIncreaseAllowance(addressToApprove, MAX_UINT);
            }
        }
    }

    function transferTokens(
        address token,
        address payable destination,
        uint256 amount
    )
    internal
    {
        if (amount > 0) {
            if (token == ETH_ADDRESS) {
                destination.call{value: amount}("");
            }
            else {
                IERC20(token).safeTransfer(destination, amount);
            }
        }

    }

    function tokenBalance(
        address token,
        address account
    )
    internal
    view
    returns (uint256)
    {
        if (token == ETH_ADDRESS) {
            return account.balance;
        } else {
            return IERC20(token).balanceOf(account);
        }
    }

    /**
    * @dev Helper method to refund gas using gas tokens
    */
    function refundGas(
        address tokenProxy,
        uint256 initialGas,
        uint256 mintPrice
    )
        internal
    {

        uint256 mintBase = 32254;
        uint256 mintToken = 36543;
        uint256 freeBase = 14154;
        uint256 freeToken = 6870;
        uint256 reimburse = 24000;

        uint256 tokens = initialGas.sub(
            gasleft()).add(freeBase).div(reimburse.mul(2).sub(freeToken)
        );

        uint256 mintCost = mintBase.add(tokens.mul(mintToken));
        uint256 freeCost = freeBase.add(tokens.mul(freeToken));
        uint256 maxreimburse = tokens.mul(reimburse);

        uint256 efficiency = maxreimburse.mul(tx.gasprice).mul(100).div(
            mintCost.mul(mintPrice).add(freeCost.mul(tx.gasprice))
        );

        if (efficiency > 100) {
            freeGasTokens(tokenProxy, tokens);
        }
    }

    /**
    * @dev Helper method to free gas tokens
    */
    function freeGasTokens(address tokenProxy, uint256 tokens) internal {

        uint256 tokensToFree = tokens;
        uint256 safeNumTokens = 0;
        uint256 gas = gasleft();

        if (gas >= 27710) {
            safeNumTokens = gas.sub(27710).div(1148 + 5722 + 150);
        }

        if (tokensToFree > safeNumTokens) {
            tokensToFree = safeNumTokens;
        }

        ITokenTransferProxy(tokenProxy).freeGSTTokens(tokensToFree);

    }
}

// File: original_contracts/IGST2.sol

pragma solidity 0.7.5;

interface IGST2 {

    function freeUpTo(uint256 value) external returns (uint256 freed);

    function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);

    function balanceOf(address who) external view returns (uint256);

    function mint(uint256 value) external;
}

// File: original_contracts/TokenTransferProxy.sol

pragma solidity 0.7.5;






/**
* @dev Allows owner of the contract to transfer tokens on behalf of user.
* User will need to approve this contract to spend tokens on his/her behalf
* on Paraswap platform
*/
contract TokenTransferProxy is Ownable {
    using SafeERC20 for IERC20;

    IGST2 private _gst2;

    address private _gstHolder;

    constructor(address gst2, address gstHolder) public {
        _gst2 = IGST2(gst2);
        _gstHolder = gstHolder;
    }

    function getGSTHolder() external view returns(address) {
        return _gstHolder;
    }

    function getGST() external view returns(address) {
        return address(_gst2);
    }

    function changeGSTTokenHolder(address gstHolder) external onlyOwner {
        _gstHolder = gstHolder;

    }

    /**
    * @dev Allows owner of the contract to transfer tokens on user's behalf
    * @dev Swapper contract will be the owner of this contract
    * @param token Address of the token
    * @param from Address from which tokens will be transferred
    * @param to Receipent address of the tokens
    * @param amount Amount of tokens to transfer
    */
    function transferFrom(
        address token,
        address from,
        address to,
        uint256 amount
    )
        external
        onlyOwner
    {
        IERC20(token).safeTransferFrom(from, to, amount);
    }

    function freeGSTTokens(uint256 tokensToFree) external onlyOwner {
        _gst2.freeFromUpTo(_gstHolder, tokensToFree);
    }

}

// File: original_contracts/IPartnerRegistry.sol

pragma solidity 0.7.5;


interface IPartnerRegistry {

    function getPartnerContract(string calldata referralId) external view returns(address);

    function addPartner(
        string calldata referralId,
        address payable feeWallet,
        uint256 fee,
        uint256 paraswapShare,
        uint256 partnerShare,
        address owner,
        uint256 timelock,
        uint256 maxFee,
        bool positiveSlippageToUser
    )
        external;

    function removePartner(string calldata referralId) external;
}

// File: original_contracts/IPartner.sol

pragma solidity 0.7.5;


interface IPartner {

    function getReferralId() external view returns(string memory);

    function getFeeWallet() external view returns(address payable);

    function getFee() external view returns(uint256);

    function getPartnerShare() external view returns(uint256);

    function getParaswapShare() external view returns(uint256);

    function changeFeeWallet(address payable feeWallet) external;

    function changeFee(uint256 newFee) external;

    function getPositiveSlippageToUser() external view returns(bool);

    function changePositiveSlippageToUser(bool slippageToUser) external;

    function getPartnerInfo() external view returns(
        address payable feeWallet,
        uint256 fee,
        uint256 partnerShare,
        uint256 paraswapShare,
        bool positiveSlippageToUser
    );
}

// File: original_contracts/lib/TokenFetcher.sol

pragma solidity 0.7.5;




contract TokenFetcher is Ownable {

    /**
    * @dev Allows owner of the contract to transfer any tokens which are assigned to the contract
    * This method is for safety if by any chance tokens or ETHs are assigned to the contract by mistake
    * @dev token Address of the token to be transferred
    * @dev destination Recepient of the token
    * @dev amount Amount of tokens to be transferred
    */
    function transferTokens(
        address token,
        address payable destination,
        uint256 amount
    )
        external
        onlyOwner
    {
        Utils.transferTokens(token, destination, amount);
    }
}

// File: original_contracts/IWETH.sol

pragma solidity 0.7.5;



abstract contract IWETH is IERC20 {
    function deposit() external virtual payable;
    function withdraw(uint256 amount) external virtual;
}

// File: original_contracts/AugustusSwapper.sol

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;













contract AugustusSwapper is Ownable, TokenFetcher {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address;

    TokenTransferProxy private _tokenTransferProxy;

    bool private _paused;

    IWhitelisted private _whitelisted;

    IPartnerRegistry private _partnerRegistry;
    address payable private _feeWallet;

    string private _version = "2.1.0";
    uint256 private _gasMintPrice;

    event Paused();
    event Unpaused();

    event Swapped(
        address initiator,
        address indexed beneficiary,
        address indexed srcToken,
        address indexed destToken,
        uint256 srcAmount,
        uint256 receivedAmount,
        uint256 expectedAmount,
        string referrer
    );

    event Bought(
        address initiator,
        address indexed beneficiary,
        address indexed srcToken,
        address indexed destToken,
        uint256 srcAmount,
        uint256 receivedAmount,
        string referrer
    );

    event FeeTaken(
        uint256 fee,
        uint256 partnerShare,
        uint256 paraswapShare
    );

    /**
     * @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");
        _;
    }

    modifier onlySelf() {
      require(
        msg.sender == address(this),
        "AugustusSwapper: Invalid access"
      );
      _;
    }


  constructor(
        address whitelist,
        address gasToken,
        address partnerRegistry,
        address payable feeWallet,
        address gstHolder
    )
        public
    {

        _partnerRegistry = IPartnerRegistry(partnerRegistry);
        _tokenTransferProxy = new TokenTransferProxy(gasToken, gstHolder);
        _whitelisted = IWhitelisted(whitelist);
        _feeWallet = feeWallet;
        _gasMintPrice = 1;
    }

    /**
    * @dev Fallback method to allow exchanges to transfer back ethers for a particular swap
    */
    receive() external payable {
    }

    function getVersion() external view returns(string memory) {
        return _version;
    }

    function getPartnerRegistry() external view returns(address) {
        return address(_partnerRegistry);
    }

    function getWhitelistAddress() external view returns(address) {
        return address(_whitelisted);
    }

    function getFeeWallet() external view returns(address) {
        return _feeWallet;
    }

    function setFeeWallet(address payable feeWallet) external onlyOwner {
        require(feeWallet != address(0), "Invalid address");
        _feeWallet = feeWallet;
    }

    function getGasMintPrice() external view returns(uint) {
        return _gasMintPrice;
    }

    function setGasMintPrice(uint gasMintPrice) external onlyOwner {
        _gasMintPrice = gasMintPrice;
    }

    function setPartnerRegistry(address partnerRegistry) external onlyOwner {
        require(partnerRegistry != address(0), "Invalid address");
        _partnerRegistry = IPartnerRegistry(partnerRegistry);
    }

    function setWhitelistAddress(address whitelisted) external onlyOwner {
        require(whitelisted != address(0), "Invalid whitelist address");
        _whitelisted = IWhitelisted(whitelisted);
    }

    function getTokenTransferProxy() external view returns (address) {
        return address(_tokenTransferProxy);
    }

    function changeGSTHolder(address gstHolder) external onlyOwner {
        require(gstHolder != address(0), "Invalid address");
        _tokenTransferProxy.changeGSTTokenHolder(gstHolder);
    }

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

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

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

    function simplBuy(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address[] memory callees,
        bytes memory exchangeData,
        uint256[] memory startIndexes,
        uint256[] memory values,
        address payable beneficiary,
        string memory referrer
    )
        external
        payable
        whenNotPaused
    {
        uint receivedAmount = performSimpleSwap(
            fromToken,
            toToken,
            fromAmount,
            toAmount,
            toAmount,//expected amount and to amount are same in case of buy
            callees,
            exchangeData,
            startIndexes,
            values,
            beneficiary,
            referrer
        );

        uint256 remainingAmount = Utils.tokenBalance(
            address(fromToken),
            address(this)
        );

        if (remainingAmount > 0) {
            Utils.transferTokens(address(fromToken), msg.sender, remainingAmount);
        }

        emit Bought(
            msg.sender,
            beneficiary == address(0)?msg.sender:beneficiary,
            address(fromToken),
            address(toToken),
            fromAmount,
            receivedAmount,
            referrer
        );
    }

    function approve(
      address token,
      address to,
      uint256 amount
    )
      external
      onlySelf
    {
      Utils.approve(to, token, amount);
    }


    function simpleSwap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        uint256 expectedAmount,
        address[] memory callees,
        bytes memory exchangeData,
        uint256[] memory startIndexes,
        uint256[] memory values,
        address payable beneficiary,
        string memory referrer
    )
        public
        payable
        whenNotPaused
        returns (uint256)
    {

        uint receivedAmount = performSimpleSwap(
            fromToken,
            toToken,
            fromAmount,
            toAmount,
            expectedAmount,
            callees,
            exchangeData,
            startIndexes,
            values,
            beneficiary,
            referrer
        );

        emit Swapped(
            msg.sender,
            beneficiary == address(0)?msg.sender:beneficiary,
            address(fromToken),
            address(toToken),
            fromAmount,
            receivedAmount,
            expectedAmount,
            referrer
        );

        return receivedAmount;
    }

    function performSimpleSwap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        uint256 expectedAmount,
        address[] memory callees,
        bytes memory exchangeData,
        uint256[] memory startIndexes,
        uint256[] memory values,
        address payable beneficiary,
        string memory referrer
    )
        private
        returns (uint256)
    {
        require(toAmount > 0, "toAmount is too low");
        require(callees.length > 0, "No callee provided");
        require(exchangeData.length > 0, "No exchangeData provided");
        require(
            callees.length + 1 == startIndexes.length,
            "Start indexes must be 1 greater then number of callees"
        );

        uint initialGas = gasleft();

        //If source token is not ETH than transfer required amount of tokens
        //from sender to this contract
        if (address(fromToken) != Utils.ethAddress()) {
            _tokenTransferProxy.transferFrom(
                address(fromToken),
                msg.sender,
                address(this),
                fromAmount
            );
        }

        for (uint256 i = 0; i < callees.length; i++) {
            require(
                callees[i] != address(_tokenTransferProxy),
                "Can not call TokenTransferProxy Contract"
            );

            bool result = externalCall(
                callees[i], //destination
                values[i], //value to send
                startIndexes[i], // start index of call data
                startIndexes[i + 1].sub(startIndexes[i]), // length of calldata
                exchangeData// total calldata
            );
            require(result, "External call failed");
        }

        uint256 receivedAmount = Utils.tokenBalance(
            address(toToken),
            address(this)
        );

        require(
            receivedAmount >= toAmount,
            "Received amount of tokens are less then expected"
        );

        takeFeeAndTransferTokens(
            toToken,
            expectedAmount,
            receivedAmount,
            beneficiary,
            referrer
        );

        if(_gasMintPrice > 0) {
          Utils.refundGas(address(_tokenTransferProxy), initialGas, _gasMintPrice);
        }

        return receivedAmount;
    }

    /**
   * @dev This function sends the WETH returned during the exchange to the user.
   * @param token: The WETH Address
   */
    function withdrawAllWETH(IWETH token) external {
        uint256 amount = token.balanceOf(address(this));
        token.withdraw(amount);
    }

    /**
   * @dev The function which performs the multi path swap.
   * @param data Data required to perform swap.
   */
    function multiSwap(
        Utils.SellData memory data
    )
        public
        payable
        whenNotPaused
        returns (uint256)
    {
        //Referral can never be empty
        require(bytes(data.referrer).length > 0, "Invalid referrer");

        require(data.toAmount > 0, "To amount can not be 0");

        uint256 receivedAmount = performSwap(
            data.fromToken,
            data.toToken,
            data.fromAmount,
            data.toAmount,
            data.path
        );

        takeFeeAndTransferTokens(
            data.toToken,
            data.expectedAmount,
            receivedAmount,
            data.beneficiary,
            data.referrer
        );

        emit Swapped(
            msg.sender,
            data.beneficiary == address(0)?msg.sender:data.beneficiary,
            address(data.fromToken),
            address(data.toToken),
            data.fromAmount,
            receivedAmount,
            data.expectedAmount,
            data.referrer
        );

        return receivedAmount;
    }

    /**
   * @dev The function which performs the single path buy.
   * @param data Data required to perform swap.
   */
    function buy(
        Utils.BuyData memory data
    )
        public
        payable
        whenNotPaused
        returns (uint256)
    {
        //Referral id can never be empty
        require(bytes(data.referrer).length > 0, "Invalid referrer");

        require(data.toAmount > 0, "To amount can not be 0");

        uint256 receivedAmount = performBuy(
            data.fromToken,
            data.toToken,
            data.fromAmount,
            data.toAmount,
            data.route
        );

        takeFeeAndTransferTokens(
            data.toToken,
            data.toAmount,
            receivedAmount,
            data.beneficiary,
            data.referrer
        );

        uint256 remainingAmount = Utils.tokenBalance(
            address(data.fromToken),
            address(this)
        );

        if (remainingAmount > 0) {
            Utils.transferTokens(address(data.fromToken), msg.sender, remainingAmount);
        }

        emit Bought(
            msg.sender,
            data.beneficiary == address(0)?msg.sender:data.beneficiary,
            address(data.fromToken),
            address(data.toToken),
            data.fromAmount,
            receivedAmount,
            data.referrer
        );

        return receivedAmount;
    }

    //Helper function to transfer final amount to the beneficiaries
    function takeFeeAndTransferTokens(
        IERC20 toToken,
        uint256 expectedAmount,
        uint256 receivedAmount,
        address payable beneficiary,
        string memory referrer

    )
        private
    {
        uint256 remainingAmount = receivedAmount;

        //Take partner fee
        ( uint256 fee ) = _takeFee(
            toToken,
            receivedAmount,
            expectedAmount,
            referrer
        );
        remainingAmount = receivedAmount.sub(fee);

        //If there is a positive slippage after taking partner fee then 50% goes to paraswap and 50% to the user
        if ((remainingAmount > expectedAmount) && fee == 0) {
            uint256 positiveSlippageShare = remainingAmount.sub(expectedAmount).div(2);
            remainingAmount = remainingAmount.sub(positiveSlippageShare);
            Utils.transferTokens(address(toToken), _feeWallet, positiveSlippageShare);
        }



        //If beneficiary is not a 0 address then it means it is a transfer transaction
        if (beneficiary == address(0)){
            Utils.transferTokens(address(toToken), msg.sender, remainingAmount);
        }
        else {
            Utils.transferTokens(address(toToken), beneficiary, remainingAmount);
        }

    }

    /**
    * @dev Source take from GNOSIS MultiSigWallet
    * @dev https://github.com/gnosis/MultiSigWallet/blob/master/contracts/MultiSigWallet.sol
    */
    function externalCall(
        address destination,
        uint256 value,
        uint256 dataOffset,
        uint dataLength,
        bytes memory data
    )
    private
    returns (bool)
    {
        bool result = false;

        assembly {
            let x := mload(0x40)   // "Allocate" memory for output (0x40 is where "free memory" pointer is stored by convention)

            let d := add(data, 32) // First 32 bytes are the padded length of data, so exclude that
            result := call(
                sub(gas(), 34710), // 34710 is the value that solidity is currently emitting
                // It includes callGas (700) + callVeryLow (3, to pay for SUB) + callValueTransferGas (9000) +
                // callNewAccountGas (25000, in case the destination address does not exist and needs creating)
                destination,
                value,
                add(d, dataOffset),
                dataLength, // Size of the input (in bytes) - this is what fixes the padding problem
                x,
                0                  // Output is ignored, therefore the output size is zero
            )
        }
        return result;
    }

    //Helper function to perform swap
    function performSwap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        Utils.Path[] memory path
    )
        private
        returns(uint256)
    {
        uint initialGas = gasleft();

        require(path.length > 0, "Path not provided for swap");
        require(
            path[path.length - 1].to == address(toToken),
            "Last to token does not match toToken"
        );

        //if fromToken is not ETH then transfer tokens from user to this contract
        if (address(fromToken) != Utils.ethAddress()) {
            _tokenTransferProxy.transferFrom(
                address(fromToken),
                msg.sender,
                address(this),
                fromAmount
            );
        }

        //Assuming path will not be too long to reach out of gas exception
        for (uint i = 0; i < path.length; i++) {
            //_fromToken will be either fromToken of toToken of the previous path
            IERC20 _fromToken = i > 0 ? IERC20(path[i - 1].to) : IERC20(fromToken);
            IERC20 _toToken = IERC20(path[i].to);

            uint _fromAmount = Utils.tokenBalance(address(_fromToken), address(this));
            if (i > 0 && address(_fromToken) == Utils.ethAddress()) {
                _fromAmount = _fromAmount.sub(path[i].totalNetworkFee);
            }

            for (uint j = 0; j < path[i].routes.length; j++) {
                Utils.Route memory route = path[i].routes[j];

                //Check if exchange is supported
                require(
                    _whitelisted.hasRole(_whitelisted.WHITELISTED_ROLE(), route.exchange),
                    "Exchange not whitelisted"
                );

                IExchange dex = IExchange(route.exchange);

                //Calculating tokens to be passed to the relevant exchange
                //percentage should be 200 for 2%
                uint fromAmountSlice = _fromAmount.mul(route.percent).div(10000);
                uint256 value = route.networkFee;

                if (j == path[i].routes.length.sub(1)) {
                    uint256 remBal = Utils.tokenBalance(address(_fromToken), address(this));

                    fromAmountSlice = remBal;

                    if (address(_fromToken) == Utils.ethAddress()) {
                        //subtract network fee
                        fromAmountSlice = fromAmountSlice.sub(value);
                    }
                }

                //Call to the exchange
                if (address(_fromToken) == Utils.ethAddress()) {
                    value = value.add(fromAmountSlice);

                    dex.swap{value: value}(_fromToken, _toToken, fromAmountSlice, 1, route.targetExchange, route.payload);
                }
                else {
                    _fromToken.safeTransfer(route.exchange, fromAmountSlice);

                    dex.swap{value: value}(_fromToken, _toToken, fromAmountSlice, 1, route.targetExchange, route.payload);
                }
            }
        }

        uint256 receivedAmount = Utils.tokenBalance(
            address(toToken),
            address(this)
        );
        require(
            receivedAmount >= toAmount,
            "Received amount of tokens are less then expected"
        );

        if (_gasMintPrice > 0) {
            Utils.refundGas(address(_tokenTransferProxy), initialGas, _gasMintPrice);
        }
        return receivedAmount;
    }

    //Helper function to perform swap
    function performBuy(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        Utils.BuyRoute[] memory routes
    )
        private
        returns(uint256)
    {
        uint initialGas = gasleft();
        IERC20 _fromToken = fromToken;
        IERC20 _toToken = toToken;

        //if fromToken is not ETH then transfer tokens from user to this contract
        if (address(_fromToken) != Utils.ethAddress()) {
            _tokenTransferProxy.transferFrom(
                address(_fromToken),
                msg.sender,
                address(this),
                fromAmount
            );
        }

        for (uint j = 0; j < routes.length; j++) {
            Utils.BuyRoute memory route = routes[j];

            //Check if exchange is supported
            require(
                _whitelisted.hasRole(_whitelisted.WHITELISTED_ROLE(), route.exchange),
                "Exchange not whitelisted"
            );
            IExchange dex = IExchange(route.exchange);


            //Call to the exchange
            if (address(_fromToken) == Utils.ethAddress()) {
                uint256 value = route.networkFee.add(route.fromAmount);
                dex.buy{value: value}(
                    _fromToken,
                    _toToken,
                    route.fromAmount,
                    route.toAmount,
                    route.targetExchange,
                    route.payload
                );
            }
            else {
                _fromToken.safeTransfer(route.exchange, route.fromAmount);
                dex.buy{value: route.networkFee}(
                    _fromToken,
                    _toToken,
                    route.fromAmount,
                    route.toAmount,
                    route.targetExchange,
                    route.payload
                );
            }
        }

        uint256 receivedAmount = Utils.tokenBalance(
            address(_toToken),
            address(this)
        );
        require(
            receivedAmount >= toAmount,
            "Received amount of tokens are less then expected tokens"
        );

        if (_gasMintPrice > 0) {
            Utils.refundGas(address(_tokenTransferProxy), initialGas, _gasMintPrice);
        }
        return receivedAmount;
    }

    function _takeFee(
        IERC20 toToken,
        uint256 receivedAmount,
        uint256 expectedAmount,
        string memory referrer
    )
        private
        returns(uint256 fee)
    {

        address partnerContract = _partnerRegistry.getPartnerContract(referrer);

        //If there is no partner associated with the referral id then no fee will be taken
        if (partnerContract == address(0)) {
            return (0);
        }

        (
            address payable partnerFeeWallet,
            uint256 feePercent,
            uint256 partnerSharePercent,
            ,
            bool positiveSlippageToUser
        ) = IPartner(partnerContract).getPartnerInfo();

        uint256 partnerShare = 0;
        uint256 paraswapShare = 0;

        if (feePercent <= 50 && receivedAmount > expectedAmount) {
            uint256 halfPositiveSlippage = receivedAmount.sub(expectedAmount).div(2);
            //Calculate total fee to be taken
            fee = expectedAmount.mul(feePercent).div(10000);
            //Calculate partner's share
            partnerShare = fee.mul(partnerSharePercent).div(10000);
            //All remaining fee is paraswap's share
            paraswapShare = fee.sub(partnerShare);
            paraswapShare = paraswapShare.add(halfPositiveSlippage);

            fee = fee.add(halfPositiveSlippage);

            if (!positiveSlippageToUser) {
                partnerShare = partnerShare.add(halfPositiveSlippage);
                fee = fee.add(halfPositiveSlippage);
            }
        }
        else {
            //Calculate total fee to be taken
            fee = receivedAmount.mul(feePercent).div(10000);
            //Calculate partner's share
            partnerShare = fee.mul(partnerSharePercent).div(10000);
            //All remaining fee is paraswap's share
            paraswapShare = fee.sub(partnerShare);
        }
        Utils.transferTokens(address(toToken), partnerFeeWallet, partnerShare);
        Utils.transferTokens(address(toToken), _feeWallet, paraswapShare);

        emit FeeTaken(fee, partnerShare, paraswapShare);
        return (fee);
    }
}

Contract Security Audit

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Contract ABI

[{"inputs":[{"internalType":"address","name":"gst2","type":"address"},{"internalType":"address","name":"gstHolder","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"gstHolder","type":"address"}],"name":"changeGSTTokenHolder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokensToFree","type":"uint256"}],"name":"freeGSTTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getGST","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGSTHolder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

Decompile Bytecode

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Deployed Bytecode Sourcemap

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Swarm Source

ipfs://9307c700eadac0c1eaed04df87bab27c0d08c7b0fa24173e7123e8ced2d8d2f5

Block		Transaction	Difficulty	Gas Used	Reward

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Multichain Portfolio | 26 Chains

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.

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