Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @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 Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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'
        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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import { IOdosExecutor } from "./interfaces/IOdosExecutor.sol";
import { ISignatureTransfer } from "./interfaces/ISignatureTransfer.sol";

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title Routing contract for Odos SOR
/// @author Semiotic AI
/// @notice Wrapper with security gaurentees around execution of arbitrary operations on user tokens
contract OdosRouterV2 is Ownable {
    using SafeERC20 for IERC20;

    /// @dev The zero address is uniquely used to represent eth since it is already
    /// recognized as an invalid ERC20, and due to its gas efficiency
    address internal constant _ETH = address(0);

    address public treasury;
    address public buyBack;

    uint256 public constant BASIS_POINTS = 10_000;
    uint256 public treasuryFee = 50; // 0.5%
    uint256 public buybackFee = 50; // 0.5%

    /// @dev Address list where addresses can be cached for use when reading from storage is cheaper
    // than reading from calldata. addressListStart is the storage slot of the first dynamic array element
    uint256 private constant addressListStart = 80084422859880547211683076133703299733277748156566366325829078699459944778998;
    address[] public addressList;

    // @dev constants for managing referrals and fees
    uint256 public constant REFERRAL_WITH_FEE_THRESHOLD = 1 << 31;
    uint256 public constant FEE_DENOM = 1e18;

    // @dev fee taken on multi-input and multi-output swaps instead of positive slippage
    uint256 public swapMultiFee;

    /// @dev Contains all information needed to describe the input and output for a swap
    struct Permit2Info {
        address contractAddress;
        uint256 nonce;
        uint256 deadline;
        bytes signature;
    }
    /// @dev Contains all information needed to describe the input and output for a swap
    struct SwapTokenInfo {
        address inputToken;
        uint256 inputAmount;
        address inputReceiver;
        address outputToken;
        uint256 outputQuote;
        uint256 outputMin;
        address outputReceiver;
    }
    /// @dev Contains all information needed to describe an intput token for swapMulti
    struct InputTokenInfo {
        address tokenAddress;
        uint256 amountIn;
        address receiver;
    }
    /// @dev Contains all information needed to describe an output token for swapMulti
    struct OutputTokenInfo {
        address tokenAddress;
        uint256 relativeValue;
        address receiver;
    }
    // @dev event for swapping one token for another
    event Swap(address sender, uint256 inputAmount, address inputToken, uint256 amountOut, address outputToken, int256 slippage, uint32 referralCode);
    /// @dev event for swapping multiple input and/or output tokens
    event SwapMulti(address sender, uint256[] amountsIn, address[] tokensIn, uint256[] amountsOut, address[] tokensOut, uint32 referralCode);

    event UpdateTreasury(address indexed newTreasury, address oldTreasury);
    event UpdateBuyBack(address indexed newBuyBack, address oldBuyBack);

    event UpdateTreasuryFee(uint256 newTreasuryFee, uint256 oldTreasuryFee);
    event UpdateBuyBackFee(uint256 newBuyBackFee, uint256 oldBuyBackFee);

    /// @dev Holds all information for a given referral
    struct ReferralInfo {
        uint64 referralFee;
        address beneficiary;
        bool registered;
    }
    /// @dev Register referral fee and information
    mapping(uint32 => ReferralInfo) public referralLookup;

    /// @dev Set the null referralCode as "Unregistered" with no additional fee
    constructor(address _treasury, address _buyBack) {
        referralLookup[0].referralFee = 0;
        referralLookup[0].beneficiary = address(0);
        referralLookup[0].registered = true;

        swapMultiFee = 5e14;

        treasury = _treasury;
        buyBack = _buyBack;
    }
    /// @dev Must exist in order for contract to receive eth
    receive() external payable {}

    /// @notice Custom decoder to swap with compact calldata for efficient execution on L2s
    // function swapCompact() external payable returns (uint256) {
    //     SwapTokenInfo memory tokenInfo;

    //     address executor;
    //     uint32 referralCode;
    //     bytes calldata pathDefinition;
    //     {
    //         address msgSender = msg.sender;

    //         assembly {
    //             // Define function to load in token address, either from calldata or from storage
    //             function getAddress(currPos) -> result, newPos {
    //                 let inputPos := shr(240, calldataload(currPos))

    //                 switch inputPos
    //                 // Reserve the null address as a special case that can be specified with 2 null bytes
    //                 case 0x0000 {
    //                     newPos := add(currPos, 2)
    //                 }
    //                 // This case means that the address is encoded in the calldata directly following the code
    //                 case 0x0001 {
    //                     result := and(shr(80, calldataload(currPos)), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
    //                     newPos := add(currPos, 22)
    //                 }
    //                 // Otherwise we use the case to load in from the cached address list
    //                 default {
    //                     result := sload(add(addressListStart, sub(inputPos, 2)))
    //                     newPos := add(currPos, 2)
    //                 }
    //             }
    //             let result := 0
    //             let pos := 4

    //             // Load in the input and output token addresses
    //             result, pos := getAddress(pos)
    //             mstore(tokenInfo, result)

    //             result, pos := getAddress(pos)
    //             mstore(add(tokenInfo, 0x60), result)

    //             // Load in the input amount - a 0 byte means the full balance is to be used
    //             let inputAmountLength := shr(248, calldataload(pos))
    //             pos := add(pos, 1)

    //             if inputAmountLength {
    //                 mstore(add(tokenInfo, 0x20), shr(mul(sub(32, inputAmountLength), 8), calldataload(pos)))
    //                 pos := add(pos, inputAmountLength)
    //             }

    //             // Load in the quoted output amount
    //             let quoteAmountLength := shr(248, calldataload(pos))
    //             pos := add(pos, 1)

    //             let outputQuote := shr(mul(sub(32, quoteAmountLength), 8), calldataload(pos))
    //             mstore(add(tokenInfo, 0x80), outputQuote)
    //             pos := add(pos, quoteAmountLength)

    //             // Load the slippage tolerance and use to get the minimum output amount
    //             {
    //                 let slippageTolerance := shr(232, calldataload(pos))
    //                 mstore(add(tokenInfo, 0xA0), div(mul(outputQuote, sub(0xFFFFFF, slippageTolerance)), 0xFFFFFF))
    //             }
    //             pos := add(pos, 3)

    //             // Load in the executor address
    //             executor, pos := getAddress(pos)

    //             // Load in the destination to send the input to - Zero denotes the executor
    //             result, pos := getAddress(pos)
    //             if eq(result, 0) {
    //                 result := executor
    //             }
    //             mstore(add(tokenInfo, 0x40), result)

    //             // Load in the destination to send the output to - Zero denotes msg.sender
    //             result, pos := getAddress(pos)
    //             if eq(result, 0) {
    //                 result := msgSender
    //             }
    //             mstore(add(tokenInfo, 0xC0), result)

    //             // Load in the referralCode
    //             referralCode := shr(224, calldataload(pos))
    //             pos := add(pos, 4)

    //             // Set the offset and size for the pathDefinition portion of the msg.data
    //             pathDefinition.length := mul(shr(248, calldataload(pos)), 32)
    //             pathDefinition.offset := add(pos, 1)
    //         }
    //     }
    //     // return _swapApproval(tokenInfo, pathDefinition, executor, referralCode);
    // }

    /// @notice Externally facing interface for swapping two tokens
    /// @param tokenInfo All information about the tokens being swapped
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function swap(
        SwapTokenInfo memory tokenInfo,
        bytes calldata pathDefinition,
        address executor,
        address targetRouter,
        uint32 referralCode
    ) external payable returns (uint256 amountOut) {
        return _swapApproval(tokenInfo, pathDefinition, executor, targetRouter, referralCode);
    }

    /// @notice Internal function for initiating approval transfers
    /// @param tokenInfo All information about the tokens being swapped
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function _swapApproval(
        SwapTokenInfo memory tokenInfo,
        bytes calldata pathDefinition,
        address executor,
        address targetRouter,
        uint32 referralCode
    ) internal returns (uint256 amountOut) {
        if (tokenInfo.inputToken == _ETH) {
            // Support rebasing tokens by allowing the user to trade the entire balance
            if (tokenInfo.inputAmount == 0) {
                tokenInfo.inputAmount = msg.value;
            } else {
                require(msg.value == tokenInfo.inputAmount, "Wrong msg.value");
            }
        } else {
            // Support rebasing tokens by allowing the user to trade the entire balance
            if (tokenInfo.inputAmount == 0) {
                tokenInfo.inputAmount = IERC20(tokenInfo.inputToken).balanceOf(msg.sender);
            }
            IERC20(tokenInfo.inputToken).safeTransferFrom(msg.sender, tokenInfo.inputReceiver, tokenInfo.inputAmount);
        }
        return _swap(tokenInfo, pathDefinition, executor, targetRouter, referralCode);
    }

    /// @notice Externally facing interface for swapping two tokens
    /// @param permit2 All additional info for Permit2 transfers
    /// @param tokenInfo All information about the tokens being swapped
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function swapPermit2(
        Permit2Info memory permit2,
        SwapTokenInfo memory tokenInfo,
        bytes calldata pathDefinition,
        address executor,
        address targetRouter,
        uint32 referralCode
    ) external returns (uint256 amountOut) {
        ISignatureTransfer(permit2.contractAddress).permitTransferFrom(
            ISignatureTransfer.PermitTransferFrom(
                ISignatureTransfer.TokenPermissions(tokenInfo.inputToken, tokenInfo.inputAmount),
                permit2.nonce,
                permit2.deadline
            ),
            ISignatureTransfer.SignatureTransferDetails(tokenInfo.inputReceiver, tokenInfo.inputAmount),
            msg.sender,
            permit2.signature
        );
        return _swap(tokenInfo, pathDefinition, executor, targetRouter, referralCode);
    }

    /// @notice contains the main logic for swapping one token for another
    /// Assumes input tokens have already been sent to their destinations and
    /// that msg.value is set to expected ETH input value, or 0 for ERC20 input
    /// @param tokenInfo All information about the tokens being swapped
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function _swap(
        SwapTokenInfo memory tokenInfo,
        bytes calldata pathDefinition,
        address executor,
        address targetRouter,
        uint32 referralCode
    ) internal returns (uint256 amountOut) {
        // Check for valid output specifications
        require(tokenInfo.outputMin <= tokenInfo.outputQuote, "Minimum greater than quote");
        // require(tokenInfo.outputMin > 0, "Slippage limit too low");
        require(tokenInfo.inputToken != tokenInfo.outputToken, "Arbitrage not supported");

        uint256 balanceBefore = _universalBalance(tokenInfo.outputToken);

        // Delegate the execution of the path to the specified Odos Executor
        uint256 msgValue = msg.value;

        if (tokenInfo.inputToken == address(0)) {
            uint256 treasuryFee = (tokenInfo.inputAmount * treasuryFee) / BASIS_POINTS;
            uint256 buybackFee = (tokenInfo.inputAmount * buybackFee) / BASIS_POINTS;
            _collectFee(treasuryFee, buybackFee);
            msgValue -= treasuryFee + buybackFee;
        }

        IOdosExecutor(executor).executePath{ value: msgValue }(targetRouter, pathDefinition, tokenInfo.inputToken, tokenInfo.inputAmount);
        amountOut = _universalBalance(tokenInfo.outputToken) - balanceBefore;

        if (tokenInfo.outputToken == address(0)) {
            uint256 treasuryFee = (amountOut * treasuryFee) / BASIS_POINTS;
            uint256 buybackFee = (amountOut * buybackFee) / BASIS_POINTS;

            _collectFee(treasuryFee, buybackFee);
            amountOut -= treasuryFee + buybackFee;
        }

        if (referralCode > REFERRAL_WITH_FEE_THRESHOLD) {
            ReferralInfo memory thisReferralInfo = referralLookup[referralCode];

            _universalTransfer(tokenInfo.outputToken, thisReferralInfo.beneficiary, (amountOut * thisReferralInfo.referralFee * 8) / (FEE_DENOM * 10));
            amountOut = (amountOut * (FEE_DENOM - thisReferralInfo.referralFee)) / FEE_DENOM;
        }

        require(amountOut >= tokenInfo.outputMin, "Slippage Limit Exceeded");

        // Transfer out the final output to the end user
        _universalTransfer(tokenInfo.outputToken, tokenInfo.outputReceiver, amountOut);

        emit Swap(msg.sender, tokenInfo.inputAmount, tokenInfo.inputToken, amountOut, tokenInfo.outputToken, 0, referralCode);
    }

    /// @notice Custom decoder to swapMulti with compact calldata for efficient execution on L2s
    // solhint-disable-next-line
    function swapMultiCompact() external payable returns (uint256[] memory amountsOut) {
        address executor;
        uint256 valueOutMin;

        InputTokenInfo[] memory inputs;
        OutputTokenInfo[] memory outputs;

        uint256 pos = 6;
        {
            address msgSender = msg.sender;

            uint256 numInputs;
            uint256 numOutputs;

            assembly {
                numInputs := shr(248, calldataload(4))
                numOutputs := shr(248, calldataload(5))
            }
            inputs = new InputTokenInfo[](numInputs);
            outputs = new OutputTokenInfo[](numOutputs);

            assembly {
                // Define function to load in token address, either from calldata or from storage
                function getAddress(currPos) -> result, newPos {
                    let inputPos := shr(240, calldataload(currPos))

                    switch inputPos
                    // Reserve the null address as a special case that can be specified with 2 null bytes
                    case 0x0000 {
                        newPos := add(currPos, 2)
                    }
                    // This case means that the address is encoded in the calldata directly following the code
                    case 0x0001 {
                        result := and(shr(80, calldataload(currPos)), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
                        newPos := add(currPos, 22)
                    }
                    // Otherwise we use the case to load in from the cached address list
                    default {
                        result := sload(add(addressListStart, sub(inputPos, 2)))
                        newPos := add(currPos, 2)
                    }
                }
                executor, pos := getAddress(pos)

                // Load in the quoted output amount
                let outputMinAmountLength := shr(248, calldataload(pos))
                pos := add(pos, 1)

                valueOutMin := shr(mul(sub(32, outputMinAmountLength), 8), calldataload(pos))
                pos := add(pos, outputMinAmountLength)

                let result := 0
                let memPos := 0

                for {
                    let element := 0
                } lt(element, numInputs) {
                    element := add(element, 1)
                } {
                    memPos := mload(add(inputs, add(mul(element, 0x20), 0x20)))

                    // Load in the token address
                    result, pos := getAddress(pos)
                    mstore(memPos, result)

                    // Load in the input amount - a 0 byte means the full balance is to be used
                    let inputAmountLength := shr(248, calldataload(pos))
                    pos := add(pos, 1)

                    if inputAmountLength {
                        mstore(add(memPos, 0x20), shr(mul(sub(32, inputAmountLength), 8), calldataload(pos)))
                        pos := add(pos, inputAmountLength)
                    }
                    result, pos := getAddress(pos)
                    if eq(result, 0) {
                        result := executor
                    }

                    mstore(add(memPos, 0x40), result)
                }
                for {
                    let element := 0
                } lt(element, numOutputs) {
                    element := add(element, 1)
                } {
                    memPos := mload(add(outputs, add(mul(element, 0x20), 0x20)))

                    // Load in the token address
                    result, pos := getAddress(pos)
                    mstore(memPos, result)

                    // Load in the quoted output amount
                    let outputAmountLength := shr(248, calldataload(pos))
                    pos := add(pos, 1)

                    mstore(add(memPos, 0x20), shr(mul(sub(32, outputAmountLength), 8), calldataload(pos)))
                    pos := add(pos, outputAmountLength)

                    result, pos := getAddress(pos)
                    if eq(result, 0) {
                        result := msgSender
                    }

                    mstore(add(memPos, 0x40), result)
                }
            }
        }
        uint32 referralCode;
        bytes calldata pathDefinition;

        assembly {
            // Load in the referralCode
            referralCode := shr(224, calldataload(pos))
            pos := add(pos, 4)

            // Set the offset and size for the pathDefinition portion of the msg.data
            pathDefinition.length := mul(shr(248, calldataload(pos)), 32)
            pathDefinition.offset := add(pos, 1)
        }
        return _swapMultiApproval(inputs, outputs, valueOutMin, pathDefinition, executor, referralCode);
    }

    /// @notice Externally facing interface for swapping between two sets of tokens
    /// @param inputs list of input token structs for the path being executed
    /// @param outputs list of output token structs for the path being executed
    /// @param valueOutMin minimum amount of value out the user will accept
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function swapMulti(
        InputTokenInfo[] memory inputs,
        OutputTokenInfo[] memory outputs,
        uint256 valueOutMin,
        bytes calldata pathDefinition,
        address executor,
        uint32 referralCode
    ) external payable returns (uint256[] memory amountsOut) {
        return _swapMultiApproval(inputs, outputs, valueOutMin, pathDefinition, executor, referralCode);
    }

    /// @notice Internal logic for swapping between two sets of tokens with approvals
    /// @param inputs list of input token structs for the path being executed
    /// @param outputs list of output token structs for the path being executed
    /// @param valueOutMin minimum amount of value out the user will accept
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function _swapMultiApproval(
        InputTokenInfo[] memory inputs,
        OutputTokenInfo[] memory outputs,
        uint256 valueOutMin,
        bytes calldata pathDefinition,
        address executor,
        uint32 referralCode
    ) internal returns (uint256[] memory amountsOut) {
        // If input amount is still 0 then that means the maximum possible input is to be used
        uint256 expectedMsgValue = 0;

        for (uint256 i = 0; i < inputs.length; i++) {
            if (inputs[i].tokenAddress == _ETH) {
                if (inputs[i].amountIn == 0) {
                    inputs[i].amountIn = msg.value;
                }
                expectedMsgValue = inputs[i].amountIn;
            } else {
                if (inputs[i].amountIn == 0) {
                    inputs[i].amountIn = IERC20(inputs[i].tokenAddress).balanceOf(msg.sender);
                }
                IERC20(inputs[i].tokenAddress).safeTransferFrom(msg.sender, inputs[i].receiver, inputs[i].amountIn);
            }
        }
        require(msg.value == expectedMsgValue, "Wrong msg.value");

        return _swapMulti(inputs, outputs, valueOutMin, pathDefinition, executor, referralCode);
    }

    /// @notice Externally facing interface for swapping between two sets of tokens with Permit2
    /// @param permit2 All additional info for Permit2 transfers
    /// @param inputs list of input token structs for the path being executed
    /// @param outputs list of output token structs for the path being executed
    /// @param valueOutMin minimum amount of value out the user will accept
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    /// @param referralCode referral code to specify the source of the swap
    function swapMultiPermit2(
        Permit2Info memory permit2,
        InputTokenInfo[] memory inputs,
        OutputTokenInfo[] memory outputs,
        uint256 valueOutMin,
        bytes calldata pathDefinition,
        address executor,
        uint32 referralCode
    ) external payable returns (uint256[] memory amountsOut) {
        ISignatureTransfer.PermitBatchTransferFrom memory permit;
        ISignatureTransfer.SignatureTransferDetails[] memory transferDetails;
        {
            uint256 permitLength = msg.value > 0 ? inputs.length - 1 : inputs.length;

            permit = ISignatureTransfer.PermitBatchTransferFrom(new ISignatureTransfer.TokenPermissions[](permitLength), permit2.nonce, permit2.deadline);
            transferDetails = new ISignatureTransfer.SignatureTransferDetails[](permitLength);
        }
        {
            uint256 expectedMsgValue = 0;
            for (uint256 i = 0; i < inputs.length; i++) {
                if (inputs[i].tokenAddress == _ETH) {
                    if (inputs[i].amountIn == 0) {
                        inputs[i].amountIn = msg.value;
                    }
                    expectedMsgValue = inputs[i].amountIn;
                } else {
                    if (inputs[i].amountIn == 0) {
                        inputs[i].amountIn = IERC20(inputs[i].tokenAddress).balanceOf(msg.sender);
                    }
                    uint256 permitIndex = expectedMsgValue == 0 ? i : i - 1;

                    permit.permitted[permitIndex].token = inputs[i].tokenAddress;
                    permit.permitted[permitIndex].amount = inputs[i].amountIn;

                    transferDetails[permitIndex].to = inputs[i].receiver;
                    transferDetails[permitIndex].requestedAmount = inputs[i].amountIn;
                }
            }
            require(msg.value == expectedMsgValue, "Wrong msg.value");
        }
        ISignatureTransfer(permit2.contractAddress).permitTransferFrom(permit, transferDetails, msg.sender, permit2.signature);
        return _swapMulti(inputs, outputs, valueOutMin, pathDefinition, executor, referralCode);
    }

    /// @notice contains the main logic for swapping between two sets of tokens
    /// assumes that inputs have already been sent to the right location and msg.value
    /// is set correctly to be 0 for no native input and match native inpuit otherwise
    /// @param inputs list of input token structs for the path being executed
    /// @param outputs list of output token structs for the path being executed
    /// @param valueOutMin minimum amount of value out the user will accept
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path

    /// @param referralCode referral code to specify the source of the swap
    // solhint-disable-next-line
    function _swapMulti(
        InputTokenInfo[] memory inputs,
        OutputTokenInfo[] memory outputs,
        uint256 valueOutMin,
        // solhint-disable-next-line
        bytes calldata pathDefinition,
        // solhint-disable-next-line
        address executor,
        uint32 referralCode
    ) internal returns (uint256[] memory amountsOut) {
        // Check for valid output specifications
        // require(valueOutMin > 0, "Slippage limit too low");

        // Extract arrays of input amount values and tokens from the inputs struct list
        uint256[] memory amountsIn = new uint256[](inputs.length);
        address[] memory tokensIn = new address[](inputs.length);

        // Check input specification validity and transfer input tokens to executor
        {
            for (uint256 i = 0; i < inputs.length; i++) {
                amountsIn[i] = inputs[i].amountIn;
                tokensIn[i] = inputs[i].tokenAddress;

                for (uint256 j = 0; j < i; j++) {
                    require(inputs[i].tokenAddress != inputs[j].tokenAddress, "Duplicate source tokens");
                }
                for (uint256 j = 0; j < outputs.length; j++) {
                    require(inputs[i].tokenAddress != outputs[j].tokenAddress, "Arbitrage not supported");
                }
            }
        }
        // Check outputs for duplicates and record balances before swap
        uint256[] memory balancesBefore = new uint256[](outputs.length);
        for (uint256 i = 0; i < outputs.length; i++) {
            for (uint256 j = 0; j < i; j++) {
                require(outputs[i].tokenAddress != outputs[j].tokenAddress, "Duplicate destination tokens");
            }
            balancesBefore[i] = _universalBalance(outputs[i].tokenAddress);
        }

        // Delegate the execution of the path to the specified Odos Executor
        // IOdosExecutor(executor).executePath{ value: msg.value }(pathDefinition, amountsIn, msg.sender);

        ReferralInfo memory thisReferralInfo;
        if (referralCode > REFERRAL_WITH_FEE_THRESHOLD) {
            thisReferralInfo = referralLookup[referralCode];
        }

        {
            uint256 valueOut;
            uint256 _swapMultiFee = swapMultiFee;
            amountsOut = new uint256[](outputs.length);

            for (uint256 i = 0; i < outputs.length; i++) {
                // Record the destination token balance before the path is executed
                amountsOut[i] = _universalBalance(outputs[i].tokenAddress) - balancesBefore[i];

                // Remove the swapMulti Fee (taken instead of positive slippage)
                amountsOut[i] = (amountsOut[i] * (FEE_DENOM - _swapMultiFee)) / FEE_DENOM;

                if (referralCode > REFERRAL_WITH_FEE_THRESHOLD) {
                    _universalTransfer(
                        outputs[i].tokenAddress,
                        thisReferralInfo.beneficiary,
                        (amountsOut[i] * thisReferralInfo.referralFee * 8) / (FEE_DENOM * 10)
                    );
                    amountsOut[i] = (amountsOut[i] * (FEE_DENOM - thisReferralInfo.referralFee)) / FEE_DENOM;
                }
                _universalTransfer(outputs[i].tokenAddress, outputs[i].receiver, amountsOut[i]);
                // Add the amount out sent to the user to the total value of output
                valueOut += amountsOut[i] * outputs[i].relativeValue;
            }
            require(valueOut >= valueOutMin, "Slippage Limit Exceeded");
        }
        address[] memory tokensOut = new address[](outputs.length);
        for (uint256 i = 0; i < outputs.length; i++) {
            tokensOut[i] = outputs[i].tokenAddress;
        }
        emit SwapMulti(msg.sender, amountsIn, tokensIn, amountsOut, tokensOut, referralCode);
    }

    /// @notice Register a new referrer, optionally with an additional swap fee
    /// @param _referralCode the referral code to use for the new referral
    /// @param _referralFee the additional fee to add to each swap using this code
    /// @param _beneficiary the address to send the referral's share of fees to
    function registerReferralCode(uint32 _referralCode, uint64 _referralFee, address _beneficiary) external {
        // Do not allow for any overwriting of referral codes
        require(!referralLookup[_referralCode].registered, "Code in use");

        // Maximum additional fee a referral can set is 2%
        require(_referralFee <= FEE_DENOM / 50, "Fee too high");

        // Reserve the lower half of referral codes to be informative only
        if (_referralCode <= REFERRAL_WITH_FEE_THRESHOLD) {
            require(_referralFee == 0, "Invalid fee for code");
        } else {
            require(_referralFee > 0, "Invalid fee for code");

            // Make sure the beneficiary is not the null address if there is a fee
            require(_beneficiary != address(0), "Null beneficiary");
        }
        referralLookup[_referralCode].referralFee = _referralFee;
        referralLookup[_referralCode].beneficiary = _beneficiary;
        referralLookup[_referralCode].registered = true;
    }

    /// @notice Set the fee used for swapMulti
    /// @param _swapMultiFee the new fee for swapMulti
    function setSwapMultiFee(uint256 _swapMultiFee) external onlyOwner {
        // Maximum swapMultiFee that can be set is 0.5%
        require(_swapMultiFee <= FEE_DENOM / 200, "Fee too high");
        swapMultiFee = _swapMultiFee;
    }

    /// @notice Push new addresses to the cached address list for when storage is cheaper than calldata
    /// @param addresses list of addresses to be added to the cached address list
    function writeAddressList(address[] calldata addresses) external onlyOwner {
        for (uint256 i = 0; i < addresses.length; i++) {
            addressList.push(addresses[i]);
        }
    }

    /// @notice Allows the owner to transfer funds held by the router contract
    /// @param tokens List of token address to be transferred
    /// @param amounts List of amounts of each token to be transferred
    /// @param dest Address to which the funds should be sent
    function transferRouterFunds(address[] calldata tokens, uint256[] calldata amounts, address dest) external onlyOwner {
        require(tokens.length == amounts.length, "Invalid funds transfer");
        for (uint256 i = 0; i < tokens.length; i++) {
            _universalTransfer(tokens[i], dest, amounts[i] == 0 ? _universalBalance(tokens[i]) : amounts[i]);
        }
    }
    /// @notice Directly swap funds held in router
    /// @param inputs list of input token structs for the path being executed
    /// @param outputs list of output token structs for the path being executed
    /// @param valueOutMin minimum amount of value out the user will accept
    /// @param pathDefinition Encoded path definition for executor
    /// @param executor Address of contract that will execute the path
    function swapRouterFunds(
        InputTokenInfo[] memory inputs,
        OutputTokenInfo[] memory outputs,
        uint256 valueOutMin,
        // solhint-disable-next-line
        bytes calldata pathDefinition,
        // solhint-disable-next-line
        address executor
    ) external onlyOwner returns (uint256[] memory amountsOut) {
        uint256[] memory amountsIn = new uint256[](inputs.length);
        address[] memory tokensIn = new address[](inputs.length);

        for (uint256 i = 0; i < inputs.length; i++) {
            tokensIn[i] = inputs[i].tokenAddress;

            amountsIn[i] = inputs[i].amountIn == 0 ? _universalBalance(tokensIn[i]) : inputs[i].amountIn;

            _universalTransfer(tokensIn[i], inputs[i].receiver, amountsIn[i]);
        }
        // Check outputs for duplicates and record balances before swap
        uint256[] memory balancesBefore = new uint256[](outputs.length);
        address[] memory tokensOut = new address[](outputs.length);
        for (uint256 i = 0; i < outputs.length; i++) {
            tokensOut[i] = outputs[i].tokenAddress;
            balancesBefore[i] = _universalBalance(tokensOut[i]);
        }
        // Delegate the execution of the path to the specified Odos Executor
        // IOdosExecutor(executor).executePath{ value: 0 }(pathDefinition, amountsIn, msg.sender);

        uint256 valueOut;
        amountsOut = new uint256[](outputs.length);
        for (uint256 i = 0; i < outputs.length; i++) {
            // Record the destination token balance before the path is executed
            amountsOut[i] = _universalBalance(tokensOut[i]) - balancesBefore[i];

            _universalTransfer(outputs[i].tokenAddress, outputs[i].receiver, amountsOut[i]);
            // Add the amount out sent to the user to the total value of output
            valueOut += amountsOut[i] * outputs[i].relativeValue;
        }
        require(valueOut >= valueOutMin, "Slippage Limit Exceeded");

        emit SwapMulti(msg.sender, amountsIn, tokensIn, amountsOut, tokensOut, 0);
    }

    function setTreasury(address _treasury) external onlyOwner {
        address oldTreasury = treasury;
        treasury = _treasury;
        emit UpdateTreasury(_treasury, oldTreasury);
    }

    function setBuyback(address _buyBack) external onlyOwner {
        address oldBuyBack = buyBack;
        buyBack = _buyBack;
        emit UpdateBuyBack(_buyBack, oldBuyBack);
    }

    function setTreasuryFee(uint256 _treasuryFee) external onlyOwner {
        require(_treasuryFee <= 1000, "Invalid fee");
        uint256 oldTreasuryFee = treasuryFee;
        treasuryFee = _treasuryFee;
        emit UpdateTreasuryFee(_treasuryFee, oldTreasuryFee);
    }

    function setBuybackFee(uint256 _buybackFee) external onlyOwner {
        require(_buybackFee <= 1000, "Invalid fee");
        uint256 oldBuybackFee = buybackFee;
        buybackFee = _buybackFee;
        emit UpdateBuyBackFee(_buybackFee, oldBuybackFee);
    }

    /// @notice helper function to get balance of ERC20 or native coin for this contract
    /// @param token address of the token to check, null for native coin
    /// @return balance of specified coin or token
    function _universalBalance(address token) private view returns (uint256) {
        if (token == _ETH) {
            return address(this).balance;
        } else {
            return IERC20(token).balanceOf(address(this));
        }
    }
    /// @notice helper function to transfer ERC20 or native coin
    /// @param token address of the token being transferred, null for native coin
    /// @param to address to transfer to
    /// @param amount to transfer
    function _universalTransfer(address token, address to, uint256 amount) private {
        if (token == _ETH) {
            (bool success, ) = payable(to).call{ value: amount }("");
            require(success, "ETH transfer failed");
        } else {
            IERC20(token).safeTransfer(to, amount);
        }
    }

    function _collectFee(uint256 _treasuryFee, uint256 _buybackFee) private {
        if (_treasuryFee > 0) {
            payable(treasury).transfer(_treasuryFee);
        }

        if (_buybackFee > 0) {
            payable(buyBack).transfer(_buybackFee);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

interface IOdosExecutor {
    function executePath(address target, bytes calldata bytecode, address inputToken, uint256 inputAmount) external payable;
    // function executePath(bytes calldata bytecode, uint256[] memory inputAmount, address msgSender) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/// @title SignatureTransfer
/// @notice Handles ERC20 token transfers through signature based actions
/// @dev Requires user's token approval on the Permit2 contract
interface ISignatureTransfer {
    /// @notice Thrown when the requested amount for a transfer is larger than the permissioned amount
    /// @param maxAmount The maximum amount a spender can request to transfer
    error InvalidAmount(uint256 maxAmount);

    /// @notice Thrown when the number of tokens permissioned to a spender does not match the number of tokens being transferred
    /// @dev If the spender does not need to transfer the number of tokens permitted, the spender can request amount 0 to be transferred
    error LengthMismatch();

    /// @notice Emits an event when the owner successfully invalidates an unordered nonce.
    event UnorderedNonceInvalidation(address indexed owner, uint256 word, uint256 mask);

    /// @notice The token and amount details for a transfer signed in the permit transfer signature
    struct TokenPermissions {
        // ERC20 token address
        address token;
        // the maximum amount that can be spent
        uint256 amount;
    }

    /// @notice The signed permit message for a single token transfer
    struct PermitTransferFrom {
        TokenPermissions permitted;
        // a unique value for every token owner's signature to prevent signature replays
        uint256 nonce;
        // deadline on the permit signature
        uint256 deadline;
    }

    /// @notice Specifies the recipient address and amount for batched transfers.
    /// @dev Recipients and amounts correspond to the index of the signed token permissions array.
    /// @dev Reverts if the requested amount is greater than the permitted signed amount.
    struct SignatureTransferDetails {
        // recipient address
        address to;
        // spender requested amount
        uint256 requestedAmount;
    }

    /// @notice Used to reconstruct the signed permit message for multiple token transfers
    /// @dev Do not need to pass in spender address as it is required that it is msg.sender
    /// @dev Note that a user still signs over a spender address
    struct PermitBatchTransferFrom {
        // the tokens and corresponding amounts permitted for a transfer
        TokenPermissions[] permitted;
        // a unique value for every token owner's signature to prevent signature replays
        uint256 nonce;
        // deadline on the permit signature
        uint256 deadline;
    }

    /// @notice A map from token owner address and a caller specified word index to a bitmap. Used to set bits in the bitmap
    /// to prevent against signature replay protection
    /// @dev Uses unordered nonces so that permit messages do not need to be spent in a certain order
    /// @dev The mapping is indexed first by the token owner, then by an index specified in the nonce
    /// @dev It returns a uint256 bitmap
    /// @dev The index, or wordPosition is capped at type(uint248).max
    function nonceBitmap(address, uint256) external view returns (uint256);

    /// @notice Transfers a token using a signed permit message
    /// @dev Reverts if the requested amount is greater than the permitted signed amount
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails The spender's requested transfer details for the permitted token
    /// @param signature The signature to verify
    function permitTransferFrom(
        PermitTransferFrom memory permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;

    /// @notice Transfers a token using a signed permit message
    /// @notice Includes extra data provided by the caller to verify signature over
    /// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
    /// @dev Reverts if the requested amount is greater than the permitted signed amount
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails The spender's requested transfer details for the permitted token
    /// @param witness Extra data to include when checking the user signature
    /// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
    /// @param signature The signature to verify
    function permitWitnessTransferFrom(
        PermitTransferFrom memory permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes32 witness,
        string calldata witnessTypeString,
        bytes calldata signature
    ) external;

    /// @notice Transfers multiple tokens using a signed permit message
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails Specifies the recipient and requested amount for the token transfer
    /// @param signature The signature to verify
    function permitTransferFrom(
        PermitBatchTransferFrom memory permit,
        SignatureTransferDetails[] calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;

    /// @notice Transfers multiple tokens using a signed permit message
    /// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
    /// @notice Includes extra data provided by the caller to verify signature over
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails Specifies the recipient and requested amount for the token transfer
    /// @param witness Extra data to include when checking the user signature
    /// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
    /// @param signature The signature to verify
    function permitWitnessTransferFrom(
        PermitBatchTransferFrom memory permit,
        SignatureTransferDetails[] calldata transferDetails,
        address owner,
        bytes32 witness,
        string calldata witnessTypeString,
        bytes calldata signature
    ) external;

    /// @notice Invalidates the bits specified in mask for the bitmap at the word position
    /// @dev The wordPos is maxed at type(uint248).max
    /// @param wordPos A number to index the nonceBitmap at
    /// @param mask A bitmap masked against msg.sender's current bitmap at the word position
    function invalidateUnorderedNonces(uint256 wordPos, uint256 mask) external;
}