Contract 0x042c37762d1d126bc61eac2f5ceb7a96318f5db9

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

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

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

pragma solidity ^0.5.0;

import "../GSN/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.
 *
 * 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.
 */
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(isOwner(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

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

pragma solidity =0.5.16;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/ownership/Ownable.sol";
import "./PoolToken.sol";
import "./interfaces/IOptiSwap.sol";
import "./interfaces/IVeloVoter.sol";
import "./interfaces/IVeloV2PoolFactory.sol";
import "./interfaces/IVeloV2Gauge.sol";
import "./interfaces/IVeloV2Pool.sol";
import "./interfaces/IVeloV2Router.sol";
import "./interfaces/IBaseV1Pair.sol";
import "./interfaces/IAeroVaultToken.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IERC20.sol";
import "./libraries/SafeToken.sol";
import "./libraries/Math.sol";

interface OptiSwapPair {
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
}

contract AeroVaultToken is IAeroVaultToken, PoolToken {
    using SafeToken for address;

    bool public constant isVaultToken = true;
    bool public constant stable = false;

    address public optiSwap;
    address public router;
    address public voter;
    address public gauge;
    address public pairFactory;
    address public rewardsToken;
    address public WETH;
    address public reinvestFeeTo;
    address public token0;
    address public token1;

    uint256 public constant MIN_REINVEST_BOUNTY = 0;
    uint256 public constant MAX_REINVEST_BOUNTY = 0.05e18;
    uint256 public REINVEST_BOUNTY = 0.02e18;
    uint256 public constant MIN_REINVEST_FEE = 0;
    uint256 public constant MAX_REINVEST_FEE = 0.05e18;
    uint256 public REINVEST_FEE = 0.02e18;
    uint256 public constant MIN_WITHDRAW_FEE_BPS = 0;
    uint256 public constant MAX_WITHDRAW_FEE_BPS = 100;
    uint256 public WITHDRAW_FEE = 1;
    uint256 public constant MAX_BPS = 10000;

    address[] reinvestorList;
    mapping(address => bool) reinvestorEnabled;

    event Reinvest(address indexed caller, uint256 reward, uint256 bounty, uint256 fee);
    event UpdateReinvestBounty(uint256 _newReinvestBounty);
    event UpdateReinvestFee(uint256 _newReinvestFee);
    event UpdateWithdrawFee(uint256 _newWithdrawFee);
    event UpdateReinvestFeeTo(address _newReinvestFeeTo);

    function _initialize(
        address _underlying,
        address _optiSwap,
        address _router,
        address _voter,
        address _pairFactory,
        address _rewardsToken,
        address _reinvestFeeTo
    ) external {
        require(factory == address(0), "VaultToken: FACTORY_ALREADY_SET"); // sufficient check
        factory = msg.sender;
        _setName("Tarot Vault Token", "vTAROT");
        underlying = _underlying;
        optiSwap = _optiSwap;
        voter = _voter;
        gauge = IVeloVoter(voter).gauges(underlying);
        require(gauge != address(0), "VaultToken: NO_GAUGE");
        router = _router;
        pairFactory = _pairFactory;
        WETH = IVeloV2Router(_router).weth();
        (token0, token1) = IBaseV1Pair(_underlying).tokens();
        rewardsToken = _rewardsToken;
        reinvestFeeTo = _reinvestFeeTo;
        rewardsToken.safeApprove(address(router), uint256(-1));
        WETH.safeApprove(address(router), uint256(-1));
        underlying.safeApprove(address(gauge), uint256(-1));
    }

    function reinvestorListLength() external view returns (uint256) {
        return reinvestorList.length;
    }

    function reinvestorListItem(uint256 index) external view returns (address) {
        return reinvestorList[index];
    }

    function isReinvestorEnabled(address reinvestor) external view returns (bool) {
        return reinvestorEnabled[reinvestor];
    }

    function _addReinvestor(address reinvestor) private {
        require(!reinvestorEnabled[reinvestor], "VaultToken: REINVESTOR_ENABLED");

        reinvestorEnabled[reinvestor] = true;
        reinvestorList.push(reinvestor);
    }

    function addReinvestor(address reinvestor) external onlyFactoryOwner {
        _addReinvestor(reinvestor);
    }

    function _indexOfReinvestor(address reinvestor) private view returns (uint256 index) {
        uint256 count = reinvestorList.length;
        for (uint256 i = 0; i < count; i++) {
            if (reinvestorList[i] == reinvestor) {
                return i;
            }
        }
        require(false, "VaultToken: REINVESTOR_NOT_FOUND");
    }

    function removeReinvestor(address reinvestor) external onlyFactoryOwner {
        require(reinvestorEnabled[reinvestor], "VaultToken: REINVESTOR_ENABLED");

        uint256 index = _indexOfReinvestor(reinvestor);
        address last = reinvestorList[reinvestorList.length - 1];
        reinvestorList[index] = last;
        reinvestorList.pop();
        delete reinvestorEnabled[reinvestor];
    }

    function updateReinvestBounty(uint256 _newReinvestBounty) external onlyFactoryOwner {
        require(_newReinvestBounty >= MIN_REINVEST_BOUNTY && _newReinvestBounty <= MAX_REINVEST_BOUNTY, "VaultToken: INVLD_REINVEST_BOUNTY");
        REINVEST_BOUNTY = _newReinvestBounty;

        emit UpdateReinvestBounty(_newReinvestBounty);
    }

    function updateReinvestFee(uint256 _newReinvestFee) external onlyFactoryOwner {
        require(_newReinvestFee >= MIN_REINVEST_FEE && _newReinvestFee <= MAX_REINVEST_FEE, "VaultToken: INVLD_REINVEST_FEE");
        REINVEST_FEE = _newReinvestFee;

        emit UpdateReinvestFee(_newReinvestFee);
    }

    function updateWithdrawFee(uint256 _newWithdrawFee) external onlyFactoryOwner {
        require(_newWithdrawFee >= MIN_WITHDRAW_FEE_BPS && _newWithdrawFee <= MAX_WITHDRAW_FEE_BPS, "VaultToken: INVLD_WITHDRAW_FEE");
        WITHDRAW_FEE = _newWithdrawFee;

        emit UpdateWithdrawFee(_newWithdrawFee);
    }

    function updateReinvestFeeTo(address _newReinvestFeeTo) external onlyFactoryOwner {
        reinvestFeeTo = _newReinvestFeeTo;

        emit UpdateReinvestFeeTo(_newReinvestFeeTo);
    }

    /*** PoolToken Overrides ***/

    function _update() internal {
        uint256 _totalBalance = IVeloV2Gauge(gauge).balanceOf(address(this));
        totalBalance = _totalBalance;
        emit Sync(_totalBalance);
    }

    // this low-level function should be called from another contract
    function mint(address minter) external nonReentrant update returns (uint256 mintTokens) {
        uint256 mintAmount = underlying.myBalance();
        // handle pools with deposit fees by checking balance before and after deposit
        uint256 _totalBalanceBefore = IVeloV2Gauge(gauge).balanceOf(address(this));
        IVeloV2Gauge(gauge).deposit(mintAmount);
        uint256 _totalBalanceAfter = IVeloV2Gauge(gauge).balanceOf(address(this));
        mintTokens = _totalBalanceAfter.sub(_totalBalanceBefore).mul(1e18).div(exchangeRate());

        if (totalSupply == 0) {
            // permanently lock the first MINIMUM_LIQUIDITY tokens
            mintTokens = mintTokens.sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY);
        }
        require(mintTokens > 0, "VaultToken: MINT_AMOUNT_ZERO");
        _mint(minter, mintTokens);
        emit Mint(msg.sender, minter, mintAmount, mintTokens);
    }

    // this low-level function should be called from another contract
    function redeem(address redeemer) external nonReentrant update returns (uint256 redeemAmount) {
        uint256 redeemTokens = balanceOf[address(this)];
        redeemAmount = redeemTokens.mul(exchangeRate()).div(1e18);
        {
            uint256 redeemFee = redeemAmount.mul(WITHDRAW_FEE).div(MAX_BPS);
            redeemAmount = redeemAmount.sub(redeemFee);
        }
        require(redeemAmount > 0, "VaultToken: REDEEM_AMOUNT_ZERO");
        require(redeemAmount <= totalBalance, "VaultToken: INSUFFICIENT_CASH");
        _burn(address(this), redeemTokens);
        IVeloV2Gauge(gauge).withdraw(redeemAmount);
        _safeTransfer(redeemer, redeemAmount);
        emit Redeem(msg.sender, redeemer, redeemAmount, redeemTokens);
    }

    /*** Reinvest ***/

    function _optimalDepositA(
        uint256 _amountA,
        uint256 _reserveA
    ) internal view returns (uint256) {
        uint256 swapFee = IVeloV2PoolFactory(pairFactory).getFee(underlying, false);
        uint256 swapFeeFactor = uint256(10000).sub(swapFee);
        uint256 a = uint256(10000).add(swapFeeFactor).mul(_reserveA);
        uint256 b = _amountA.mul(10000).mul(_reserveA).mul(4).mul(swapFeeFactor);
        uint256 c = Math.sqrt(a.mul(a).add(b));
        uint256 d = uint256(2).mul(swapFeeFactor);
        return c.sub(a).div(d);
    }

    function approveRouter(address token, uint256 amount) internal {
        if (IERC20(token).allowance(address(this), router) >= amount) return;
        token.safeApprove(address(router), uint256(-1));
    }

    function swapExactTokensForTokens(
        address tokenIn,
        address tokenOut,
        uint256 amount
    ) internal {
        approveRouter(tokenIn, amount);
        IVeloV2Router.Route[] memory routes = new IVeloV2Router.Route[](1);
        routes[0].from = tokenIn;
        routes[0].to = tokenOut;
        routes[0].stable = false;
        routes[0].factory = IVeloV2Pool(underlying).factory();

        IVeloV2Router(router).swapExactTokensForTokens(amount, 0, routes, address(this), block.timestamp);
    }

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountA,
        uint256 amountB
    ) internal returns (uint256 liquidity) {
        approveRouter(tokenA, amountA);
        approveRouter(tokenB, amountB);
        (, , liquidity) = IVeloV2Router(router).addLiquidity(tokenA, tokenB, false, amountA, amountB, 0, 0, address(this), block.timestamp);
    }

    function swapTokensForBestAmountOut(
        IOptiSwap _optiSwap,
        address tokenIn,
        address tokenOut,
        uint256 amountIn
    ) internal returns (uint256 amountOut) {
        if (tokenIn == tokenOut) {
            return amountIn;
        }
        address pair;
        (pair, amountOut) = _optiSwap.getBestAmountOut(amountIn, tokenIn, tokenOut);
        require(pair != address(0), "NO_PAIR");
        tokenIn.safeTransfer(pair, amountIn);
        if (tokenIn < tokenOut) {
            OptiSwapPair(pair).swap(0, amountOut, address(this), new bytes(0));
        } else {
            OptiSwapPair(pair).swap(amountOut, 0, address(this), new bytes(0));
        }
    }

    function optiSwapExactTokensForTokens(
        address tokenIn,
        address tokenOut,
        uint256 amountIn
    ) internal returns (uint256 amountOut) {
        if (tokenIn == tokenOut) {
            return amountIn;
        }
        IOptiSwap _optiSwap = IOptiSwap(optiSwap);
        address nextHop = _optiSwap.getBridgeToken(tokenIn);
        if (nextHop == tokenOut) {
            return swapTokensForBestAmountOut(_optiSwap, tokenIn, tokenOut, amountIn);
        }
        address waypoint = _optiSwap.getBridgeToken(tokenOut);
        if (tokenIn == waypoint) {
            return swapTokensForBestAmountOut(_optiSwap, tokenIn, tokenOut, amountIn);
        }
        uint256 hopAmountOut;
        if (nextHop != tokenIn) {
            hopAmountOut = swapTokensForBestAmountOut(_optiSwap, tokenIn, nextHop, amountIn);
        } else {
            hopAmountOut = amountIn;
        }
        if (nextHop == waypoint) {
            return swapTokensForBestAmountOut(_optiSwap, nextHop, tokenOut, hopAmountOut);
        } else if (waypoint == tokenOut) {
            return optiSwapExactTokensForTokens(nextHop, tokenOut, hopAmountOut);
        } else {
            uint256 waypointAmountOut = optiSwapExactTokensForTokens(nextHop, waypoint, hopAmountOut);
            return swapTokensForBestAmountOut(_optiSwap, waypoint, tokenOut, waypointAmountOut);
        }
    }

    function _getReward() internal returns (uint256 amount) {
        IVeloV2Gauge(gauge).getReward(address(this));

        return rewardsToken.myBalance();
    }

    function getReward() external nonReentrant returns (uint256) {
        require(msg.sender == tx.origin || reinvestorEnabled[msg.sender]);
        return _getReward();
    }

    function reinvest() external nonReentrant update {
        require(msg.sender == tx.origin || reinvestorEnabled[msg.sender]);
        // 1. Withdraw all the rewards.
        uint256 reward = _getReward();
        if (reward == 0) return;
        // 2. Send the reward bounty to the caller.
        uint256 bounty = reward.mul(REINVEST_BOUNTY) / 1e18;
        if (bounty > 0) {
            rewardsToken.safeTransfer(msg.sender, bounty);
        }
        uint256 fee = reward.mul(REINVEST_FEE) / 1e18;
        if (fee > 0) {
            rewardsToken.safeTransfer(reinvestFeeTo, fee);
        }
        // 3. Convert all the remaining rewards to token0 or token1.
        address tokenA;
        address tokenB;
        if (token0 == rewardsToken || token1 == rewardsToken) {
            (tokenA, tokenB) = token0 == rewardsToken ? (token0, token1) : (token1, token0);
        } else {
            if (token1 == WETH) {
                (tokenA, tokenB) = (token1, token0);
            } else {
                (tokenA, tokenB) = (token0, token1);
            }
            optiSwapExactTokensForTokens(rewardsToken, tokenA, reward.sub(bounty.add(fee)));
        }
        // 4. Convert tokenA to LP Token underlyings.
        uint256 totalAmountA = tokenA.myBalance();
        assert(totalAmountA > 0);
        (uint256 r0, uint256 r1, ) = IUniswapV2Pair(underlying).getReserves();
        uint256 reserveA = tokenA == token0 ? r0 : r1;
        uint256 swapAmount = _optimalDepositA(totalAmountA, reserveA);
        swapExactTokensForTokens(tokenA, tokenB, swapAmount);
        uint256 liquidity = addLiquidity(tokenA, tokenB, totalAmountA.sub(swapAmount), tokenB.myBalance());
        // 5. Stake the LP Tokens.
        IVeloV2Gauge(gauge).deposit(liquidity);
        emit Reinvest(msg.sender, reward, bounty, fee);
    }

    function adminClaimRewards() external onlyFactoryOwner nonReentrant {
        IVeloV2Gauge(gauge).getReward(address(this));
    }

    function adminRescueTokens(address _to, address[] calldata _tokens) external onlyFactoryOwner nonReentrant {
        require(_to != address(0), "VaultToken: INVLD_TO");

        for (uint256 i = 0; i < _tokens.length; i++) {
            address token = _tokens[i];
            require(token != underlying, "VaultToken: IS_UNDERLYING");
            require(token != rewardsToken, "VaultToken: IS_REWARDS_TOKEN");
            require(token != token0, "VaultToken: IS_TOKEN_0");
            require(token != token1, "VaultToken: IS_TOKEN_1");

            uint256 tokenBalance = token.myBalance();
            if (tokenBalance > 0) {
                token.safeTransfer(_to, tokenBalance);
            }
        }
    }

    /*** Mirrored From uniswapV2Pair ***/

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        )
    {
        (uint _reserve0, uint _reserve1, uint _blockTimestampLast) = IUniswapV2Pair(underlying).getReserves();
        reserve0 = safe112(_reserve0);
        reserve1 = safe112(_reserve1);
        blockTimestampLast = uint32(_blockTimestampLast % 2**32);
        // if no token has been minted yet mirror uniswap getReserves
        if (totalSupply == 0) return (reserve0, reserve1, blockTimestampLast);
        // else, return the underlying reserves of this contract
        uint256 _totalBalance = totalBalance;
        uint256 _totalSupply = IUniswapV2Pair(underlying).totalSupply();
        reserve0 = safe112(_totalBalance.mul(reserve0).div(_totalSupply));
        reserve1 = safe112(_totalBalance.mul(reserve1).div(_totalSupply));
        require(reserve0 > 100 && reserve1 > 100, "VaultToken: INSUFFICIENT_RESERVES");
    }

    /*** Mirrored from BaseV1Pair ***/

    function observationLength() external view returns (uint) {
        return IBaseV1Pair(underlying).observationLength();
    }

    function observations(uint index)
        external
        view
        returns (
            uint timestamp,
            uint reserve0Cumulative,
            uint reserve1Cumulative
        )
    {
        return IBaseV1Pair(underlying).observations(index);
    }

    function currentCumulativePrices()
        external
        view
        returns (
            uint reserve0Cumulative,
            uint reserve1Cumulative,
            uint timestamp
        )
    {
        return IBaseV1Pair(underlying).currentCumulativePrices();
    }

    /*** Utilities ***/

    function safe112(uint256 n) internal pure returns (uint112) {
        require(n < 2**112, "VaultToken: SAFE112");
        return uint112(n);
    }

    function getBlockTimestamp() public view returns (uint32) {
        return uint32(block.timestamp % 2**32);
    }

    /*** Modifiers ***/

    modifier onlyFactoryOwner() {
        require(Ownable(factory).owner() == msg.sender, "NOT_AUTHORIZED");
        _;
    }
}

pragma solidity >=0.5.0;

interface IAeroVaultToken {
    /*** Tarot ERC20 ***/

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /*** Pool Token ***/

    event Mint(address indexed sender, address indexed minter, uint256 mintAmount, uint256 mintTokens);
    event Redeem(address indexed sender, address indexed redeemer, uint256 redeemAmount, uint256 redeemTokens);
    event Sync(uint256 totalBalance);

    function underlying() external view returns (address);

    function factory() external view returns (address);

    function totalBalance() external view returns (uint256);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function exchangeRate() external view returns (uint256);

    function mint(address minter) external returns (uint256 mintTokens);

    function redeem(address redeemer) external returns (uint256 redeemAmount);

    function skim(address to) external;

    function sync() external;

    function _setFactory() external;

    /*** VaultToken ***/

    event Reinvest(address indexed caller, uint256 reward, uint256 bounty, uint256 fee);

    function isVaultToken() external pure returns (bool);

    function stable() external pure returns (bool);

    function optiSwap() external view returns (address);

    function router() external view returns (address);

    function voter() external view returns (address);

    function pairFactory() external view returns (address);

    function rewardsToken() external view returns (address);

    function WETH() external view returns (address);

    function reinvestFeeTo() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function REINVEST_BOUNTY() external view returns (uint256);

    function REINVEST_FEE() external view returns (uint256);

    function WITHDRAW_FEE() external view returns (uint256);

    function reinvestorListLength() external view returns (uint256);

    function reinvestorListItem(uint256 index) external view returns (address);

    function isReinvestorEnabled(address reinvestor) external view returns (bool);

    function addReinvestor(address reinvestor) external;

    function removeReinvestor(address reinvestor) external;

    function updateReinvestBounty(uint256 _newReinvestBounty) external;

    function updateReinvestFee(uint256 _newReinvestFee) external;

    function updateWithdrawFee(uint256 _newWithdrawFee) external;

    function updateReinvestFeeTo(address _newReinvestFeeTo) external;

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function observationLength() external view returns (uint);

    function observations(uint index)
        external
        view
        returns (
            uint timestamp,
            uint reserve0Cumulative,
            uint reserve1Cumulative
        );

    function currentCumulativePrices()
        external
        view
        returns (
            uint reserve0Cumulative,
            uint reserve1Cumulative,
            uint timestamp
        );

    function _initialize(
        address _underlying,
        address _optiSwap,
        address _router,
        address _voter,
        address _pairFactory,
        address _rewardsToken,
        address _reinvestFeeTo
    ) external;

    function reinvest() external;

    function getReward() external returns (uint256);

    function getBlockTimestamp() external view returns (uint32);

    function adminClaimRewards() external;

    function adminRescueTokens(address _to, address[] calldata _tokens) external;
}

pragma solidity >=0.5.0;

interface IBaseV1Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function stable() external view returns (bool);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
	
    function token0() external view returns (address);
    function token1() external view returns (address);
    function tokens() external view returns (address, address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function observationLength() external view returns (uint);
    function observations(uint) external view returns (
        uint timestamp,
        uint reserve0Cumulative,
        uint reserve1Cumulative
    );
    function currentCumulativePrices() external view returns (
        uint reserve0Cumulative,
        uint reserve1Cumulative,
        uint timestamp
    );

    function metadata() external view returns (uint, uint, uint, uint, bool, address, address);
}

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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

    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IOptiSwap {
    function weth() external view returns (address);

    function bridgeFromTokens(uint256 index) external view returns (address token);

    function bridgeFromTokensLength() external view returns (uint256);

    function getBridgeToken(address _token) external view returns (address bridgeToken);

    function addBridgeToken(address _token, address _bridgeToken) external;

    function getDexInfo(uint256 index) external view returns (address dex, address handler);

    function dexListLength() external view returns (uint256);

    function indexOfDex(address _dex) external view returns (uint256);

    function getDexEnabled(address _dex) external view returns (bool);

    function addDex(address _dex, address _handler) external;

    function removeDex(address _dex) external;

    function getBestAmountOut(
        uint256 _amountIn,
        address _tokenIn,
        address _tokenOut
    ) external view returns (address pair, uint256 amountOut);
}

pragma solidity >=0.5.0;

interface IPoolToken {
    /*** Tarot ERC20 ***/

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /*** Pool Token ***/

    event Mint(
        address indexed sender,
        address indexed minter,
        uint256 mintAmount,
        uint256 mintTokens
    );
    event Redeem(
        address indexed sender,
        address indexed redeemer,
        uint256 redeemAmount,
        uint256 redeemTokens
    );
    event Sync(uint256 totalBalance);

    function underlying() external view returns (address);

    function factory() external view returns (address);

    function totalBalance() external view returns (uint256);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function exchangeRate() external view returns (uint256);

    function mint(address minter) external returns (uint256 mintTokens);

    function redeem(address redeemer) external returns (uint256 redeemAmount);

    function skim(address to) external;

    function sync() external;

    function _setFactory() external;
}

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);
}

pragma solidity >=0.5.0;

interface IVeloV2Gauge {
    function notifyRewardAmount(uint amount) external;
    function getReward(address account) external;
    function left() external view returns (uint);
    function isPool() external view returns (bool);
    function earned(address account) external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function deposit(uint256 amount) external;
    function withdraw(uint256 amount) external;
}

pragma solidity >=0.5.0;

interface IVeloV2Pool {
    function factory() external view returns (address);
}

pragma solidity >=0.5.0;

interface IVeloV2PoolFactory {
    function allPoolsLength() external view returns (uint);
    function isPair(address pair) external view returns (bool);
    function getPair(address tokenA, address tokenB, bool stable) external view returns (address);
    function createPair(address tokenA, address tokenB, bool stable) external returns (address pair);
    function getFee(address pool, bool _stable) external view returns (uint);
}

pragma solidity >=0.5.0;
pragma experimental ABIEncoderV2;

interface IVeloV2Router {
    struct Route {
        address from;
        address to;
        bool stable;
        address factory;
    }

    function weth() external view returns (address);

    /// @notice Add liquidity of two tokens to a Pool
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           True if pool is stable, false if volatile
    /// @param amountADesired   Amount of tokenA desired to deposit
    /// @param amountBDesired   Amount of tokenB desired to deposit
    /// @param amountAMin       Minimum amount of tokenA to deposit
    /// @param amountBMin       Minimum amount of tokenB to deposit
    /// @param to               Recipient of liquidity token
    /// @param deadline         Deadline to receive liquidity
    /// @return amountA         Amount of tokenA to actually deposit
    /// @return amountB         Amount of tokenB to actually deposit
    /// @return liquidity       Amount of liquidity token returned from deposit
    function addLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @notice Swap one token for another
    /// @param amountIn     Amount of token in
    /// @param amountOutMin Minimum amount of desired token received
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    /// @return amounts     Array of amounts returned per route
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
}

pragma solidity >=0.5.0;

interface IVeloVoter {
    function _ve() external view returns (address);
    function governor() external view returns (address);
    function emergencyCouncil() external view returns (address);
    function attachTokenToGauge(uint _tokenId, address account) external;
    function detachTokenFromGauge(uint _tokenId, address account) external;
    function emitDeposit(uint _tokenId, address account, uint amount) external;
    function emitWithdraw(uint _tokenId, address account, uint amount) external;
    function isWhitelisted(address token) external view returns (bool);
    function notifyRewardAmount(uint amount) external;
    function distribute(address _gauge) external;
    function gauges(address token) external view returns (address);
}

pragma solidity =0.5.16;

// a library for performing various math operations
// forked from: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/libraries/Math.sol

library Math {
    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

pragma solidity =0.5.16;

// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol
// Subject to the MIT license.

/**
 * @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 addition of two unsigned integers, reverting with custom message on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction underflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    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 multiplication of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) 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, errorMessage);

        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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

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

pragma solidity 0.5.16;

interface ERC20Interface {
    function balanceOf(address user) external view returns (uint256);
}

library SafeToken {
    function myBalance(address token) internal view returns (uint256) {
        return ERC20Interface(token).balanceOf(address(this));
    }

    function balanceOf(address token, address user)
        internal
        view
        returns (uint256)
    {
        return ERC20Interface(token).balanceOf(user);
    }

    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(0x095ea7b3, to, value)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "!safeApprove"
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(0xa9059cbb, to, value)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "!safeTransfer"
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(0x23b872dd, from, to, value)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "!safeTransferFrom"
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call.value(value)(new bytes(0));
        require(success, "!safeTransferETH");
    }
}

pragma solidity =0.5.16;

import "./TarotERC20.sol";
import "./interfaces/IERC20.sol";
import "./interfaces/IPoolToken.sol";
import "./libraries/SafeMath.sol";

contract PoolToken is IPoolToken, TarotERC20 {
    uint256 internal constant initialExchangeRate = 1e18;
    address public underlying;
    address public factory;
    uint256 public totalBalance;
    uint256 public constant MINIMUM_LIQUIDITY = 1000;

    event Mint(
        address indexed sender,
        address indexed minter,
        uint256 mintAmount,
        uint256 mintTokens
    );
    event Redeem(
        address indexed sender,
        address indexed redeemer,
        uint256 redeemAmount,
        uint256 redeemTokens
    );
    event Sync(uint256 totalBalance);

    /*** Initialize ***/

    // called once by the factory
    function _setFactory() external {
        require(factory == address(0), "Tarot: FACTORY_ALREADY_SET");
        factory = msg.sender;
    }

    /*** PoolToken ***/

    function _update() internal {
        totalBalance = IERC20(underlying).balanceOf(address(this));
        emit Sync(totalBalance);
    }

    function exchangeRate() public view returns (uint256) {
        uint256 _totalSupply = totalSupply; // gas savings
        uint256 _totalBalance = totalBalance; // gas savings
        if (_totalSupply == 0 || _totalBalance == 0) return initialExchangeRate;
        return _totalBalance.mul(1e18).div(_totalSupply);
    }

    // this low-level function should be called from another contract
    function mint(address minter)
        external
        nonReentrant
        update
        returns (uint256 mintTokens)
    {
        uint256 balance = IERC20(underlying).balanceOf(address(this));
        uint256 mintAmount = balance.sub(totalBalance);
        mintTokens = mintAmount.mul(1e18).div(exchangeRate());

        if (totalSupply == 0) {
            // permanently lock the first MINIMUM_LIQUIDITY tokens
            mintTokens = mintTokens.sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY);
        }
        require(mintTokens > 0, "Tarot: MINT_AMOUNT_ZERO");
        _mint(minter, mintTokens);
        emit Mint(msg.sender, minter, mintAmount, mintTokens);
    }

    // this low-level function should be called from another contract
    function redeem(address redeemer)
        external
        nonReentrant
        update
        returns (uint256 redeemAmount)
    {
        uint256 redeemTokens = balanceOf[address(this)];
        redeemAmount = redeemTokens.mul(exchangeRate()).div(1e18);

        require(redeemAmount > 0, "Tarot: REDEEM_AMOUNT_ZERO");
        require(redeemAmount <= totalBalance, "Tarot: INSUFFICIENT_CASH");
        _burn(address(this), redeemTokens);
        _safeTransfer(redeemer, redeemAmount);
        emit Redeem(msg.sender, redeemer, redeemAmount, redeemTokens);
    }

    // force real balance to match totalBalance
    function skim(address to) external nonReentrant {
        _safeTransfer(
            to,
            IERC20(underlying).balanceOf(address(this)).sub(totalBalance)
        );
    }

    // force totalBalance to match real balance
    function sync() external nonReentrant update {}

    /*** Utilities ***/

    // same safe transfer function used by UniSwapV2 (with fixed underlying)
    bytes4 private constant SELECTOR =
        bytes4(keccak256(bytes("transfer(address,uint256)")));

    function _safeTransfer(address to, uint256 amount) internal {
        (bool success, bytes memory data) = underlying.call(
            abi.encodeWithSelector(SELECTOR, to, amount)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "Tarot: TRANSFER_FAILED"
        );
    }

    // prevents a contract from calling itself, directly or indirectly.
    bool internal _notEntered = true;
    modifier nonReentrant() {
        require(_notEntered, "Tarot: REENTERED");
        _notEntered = false;
        _;
        _notEntered = true;
    }

    // update totalBalance with current balance
    modifier update() {
        _;
        _update();
    }
}

pragma solidity =0.5.16;

import "./libraries/SafeMath.sol";

// This contract is basically UniswapV2ERC20 with small modifications
// src: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol

contract TarotERC20 {
    using SafeMath for uint256;

    string public name;
    string public symbol;
    uint8 public decimals = 18;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    mapping(address => uint256) public nonces;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    constructor() public {}

    function _setName(string memory _name, string memory _symbol) internal {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                ),
                keccak256(bytes(_name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal {
        balanceOf[from] = balanceOf[from].sub(
            value,
            "Tarot: TRANSFER_TOO_HIGH"
        );
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(
                value,
                "Tarot: TRANSFER_NOT_ALLOWED"
            );
        }
        _transfer(from, to, value);
        return true;
    }

    function _checkSignature(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s,
        bytes32 typehash
    ) internal {
        require(deadline >= block.timestamp, "Tarot: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                keccak256(
                    abi.encode(
                        typehash,
                        owner,
                        spender,
                        value,
                        nonces[owner]++,
                        deadline
                    )
                )
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(
            recoveredAddress != address(0) && recoveredAddress == owner,
            "Tarot: INVALID_SIGNATURE"
        );
    }

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        _checkSignature(
            owner,
            spender,
            value,
            deadline,
            v,
            r,
            s,
            PERMIT_TYPEHASH
        );
        _approve(owner, spender, value);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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