Token CoffinToken

 

Overview ERC-20

Price
$0.00 @ 0.000000 FTM
Fully Diluted Market Cap
Total Supply:
23,026,671.1334 COFFIN

Holders:
830 addresses

Transfers:
-

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OVERVIEW

Decentralized and capital-efficient partially collateralized stablecoin protocol on Fantom Opera!

Market

Volume (24H):$355.67
Market Capitalization:$0.00
Circulating Supply:0.00 COFFIN
Market Data Source: Coinmarketcap


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Contract Source Code Verified (Exact Match)

Contract Name:
Coffin

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 500 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 20 : Coffin.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "./TaxableToken.sol";

contract Coffin is TaxableToken, Initializable {
    using SafeMath for uint256;
    uint256 public constant genesis_supply = 3_000_000 ether; // for initial liquidity. 
    // 
    uint256 public constant REWARD_ALLOCATION = 97_000_000 ether; // 
    uint256 public rewardClaimed;
    function init(
        address _maker
    ) external initializer onlyOwner {
        coffin_pools[_maker] = true;
        coffin_pools_array.push(_maker);

        // coffin_pools[msg.sender] = true;
        // coffin_pools_array.push(msg.sender);
        
        _mint(msg.sender, genesis_supply);
    }

    function reward_mint(address recipient, uint256 amount) public onlyPools {
        require(amount > 0, "invalidAmount");
        require(recipient != address(0), "!rewardController");
        uint256 _remainingRewards = REWARD_ALLOCATION - rewardClaimed;
        require(amount <= _remainingRewards, "exceedRewards");
        rewardClaimed = rewardClaimed + amount;
        super._mint(recipient, amount);
        emit Minted(msg.sender, recipient, amount);
    }
    
    // constructor() TaxableToken("TestToken", "testSHARE") {}
    constructor() TaxableToken("CoffinToken", "COFFIN") {}

    event MaxTotalSupplyUpdated(uint256 _newCap);
}

File 2 of 20 : Initializable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

File 3 of 20 : TaxableToken.sol
// SPDX-License-Identifier: MIT
// coffin finance
pragma solidity ^0.8.7;
// pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "./CoffinOracle.sol";
import "./PoolToken.sol";
import "./libs/Babylonian.sol";
import './interfaces/ITaxableTokenPolicy.sol';

contract TaxableToken is PoolToken {
    using SafeMath for uint256;
    address public coffinOracle;
    // fixed tax rate
    uint16 public staticTaxRate = 0;
    // latest tax rate
    uint16 public latestTaxRate = 0;
    // Address of the Tax Office
    address public taxOffice;
    // Address of the tax collector wallet
    address public taxCollectorAddress;
    // Tax Policy
    address public policy; 
    // 
    bool public using_twap;
    // Dollar Price threshold below which taxes will get burned
    uint256 public burnThreshold = 0.98e18;
    uint256 public taxThreshold = 1e18;
    //
    bool public taxActivated = false;
    bool public autoCalculateTax = false;
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;

    uint16 public maxTaxRate = 2000;

    // basis tax rate. 0.05% by default.
    // believe it should be bigger than flashloan fee.
    //  C.R.E.A.M => 0.03% , AAVE => 0.09%.
    uint16 public basisTaxRate = 5;
    uint32 public adjustTaxRateA = 2000000;
    uint32 public adjustTaxRateB = 4;

    mapping(address => bool) private _isExcluded;
    address[] private _excluded;

    // modifier
    modifier onlyOwnerOrTaxOffice() {
        require(
            owner() == msg.sender || taxOffice == msg.sender,
            "Caller is not the owner or the tax office"
        );
        _;
    }

    // constructor
    constructor(string memory _name, string memory _symbol)
        PoolToken(_name, _symbol)
    {}

    // internal

    // get current coUSD price
    function _getCoUSDPrice() public view returns (uint256 _price) {
        if (using_twap) {
            (uint256 __price, uint8 __d) = ICoffinOracle(coffinOracle)
                .getTwapCOUSDUSD();
            _price = __price * (10**(18 - __d));
        } else {
            (uint256 __price, uint8 __d) = ICoffinOracle(coffinOracle)
                .getCOUSDUSD();
            _price = __price * (10**(18 - __d));
        }
    }
    function setTaxPolicy(address _policy) external onlyOwner {
        require(_policy!=address(0), 'wrong tax policy' );
        policy = _policy;
    }
    function calcAutoTaxRate(uint256 _cousdPrice) public view returns (uint16) {
        if (policy==address(0)) {
            return 0;
        }

        return ITaxableTokenPolicy(policy).calcTaxRate(
            _cousdPrice, 
            taxThreshold, 
            adjustTaxRateA, 
            adjustTaxRateB, 
            basisTaxRate,
            maxTaxRate
        );
    }

    function getTaxInfo()
        private
        view
        returns (
            uint16 _currentTaxRate,
            uint16 _staticTaxRate,
            uint256 _burnThreshold,
            uint256 _taxThreshold,
            bool _taxActivated,
            bool _autoCalculateTax,
            uint16 _maxTaxRate,
            uint32 _adjustTaxRateA,
            bool _burnTax,
            uint256 _currentCoUSDPrice,
            uint256 __rawPrice,
            uint8 __rawDecimal,
            uint32 _adjustTaxRateB
        )
    {
        _burnThreshold = burnThreshold;
        _taxThreshold = taxThreshold;
        _taxActivated = taxActivated;
        _autoCalculateTax = autoCalculateTax;
        _maxTaxRate = maxTaxRate;
        _adjustTaxRateA = adjustTaxRateA;
        _staticTaxRate = staticTaxRate;
        (_currentTaxRate, _burnTax, _currentCoUSDPrice) = _getTaxInfo();
        (__rawPrice, __rawDecimal) = ICoffinOracle(coffinOracle).getCOUSDUSD();
        _adjustTaxRateB = adjustTaxRateB;
    }

    function _getTaxInfo()
        private
        view
        returns (
            uint16 currentTaxRate,
            bool burnTax,
            uint256 currentCoUSDPrice
        )
    {
        if (taxActivated) {
            (currentCoUSDPrice) = _getCoUSDPrice();
            if (currentCoUSDPrice > 0 && currentCoUSDPrice < taxThreshold) {
                if (currentCoUSDPrice < burnThreshold) {
                    burnTax = true;
                }
                if (autoCalculateTax) {
                    currentTaxRate = calcAutoTaxRate(currentCoUSDPrice);
                } else {
                    currentTaxRate = staticTaxRate;
                }
            }
        }
    }
    
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        
        
        (uint16 currentTaxRate, bool burnTax, ) = _getTaxInfo();

        latestTaxRate = currentTaxRate;
        if (
            currentTaxRate == 0 ||
            coffin_pools[sender] ||
            coffin_pools[recipient] ||
            _isExcluded[sender] ||
            _isExcluded[recipient]
        ) {
            super._transfer(sender, recipient, amount);
        } else {
            _transferWithTax(
                sender,
                recipient,
                amount,
                currentTaxRate,
                burnTax
            );
        }
        
    }


    function _transferWithTax(
        address sender,
        address recipient,
        uint256 amount,
        uint16 _taxRate,
        bool burnTax
    ) internal returns (bool) {

        if (_taxRate>maxTaxRate) {
            _taxRate = maxTaxRate;
        }

        uint256 taxAmount = amount.mul(_taxRate).div(10000);
        uint256 amountAfterTax = amount.sub(taxAmount);

        require(taxAmount < amount, "the tax amount should be less than the transferred amount.");

        if (burnTax) {
            // Burn tax
            if (taxAmount>0) {
                super._burn(sender, taxAmount);
            }
        } else {
            // Transfer tax to tax collector
            if (taxAmount>0) {
                super._transfer(sender, taxCollectorAddress, taxAmount);
            }   
        }

        // Transfer amount after tax to recipient
        if (amountAfterTax>0) {
            super._transfer(sender, recipient, amountAfterTax);
        }
        
        return true;
    }

    /********** onlyOwnerOrTaxOffice ************/
    // set coffinOracle
    function setCoffinOracle(address _coffinOracle)
        public
        onlyOwnerOrTaxOffice
    {
        require(
            _coffinOracle != address(0),
            "oracle address cannot be 0 address"
        );
        coffinOracle = _coffinOracle;
    }

    function enableAutoCalculateTax() public onlyOwnerOrTaxOffice {
        autoCalculateTax = true;
    }

    function disableAutoCalculateTax() public onlyOwnerOrTaxOffice {
        autoCalculateTax = false;
    }
    
    function enableTwap() public onlyOwnerOrTaxOffice {
        using_twap = true;
    }

    function disablTwap() public onlyOwnerOrTaxOffice {
        using_twap = false;
    }

    function enableTax() public onlyOwnerOrTaxOffice {
        taxActivated = true;
    }

    function disableTax() public onlyOwnerOrTaxOffice {
        taxActivated = false;
    }

    function setTaxOffice(address _taxOffice) public onlyOwnerOrTaxOffice {
        require(
            _taxOffice != address(0),
            "tax office address cannot be 0 address"
        );
        emit TaxOfficeTransferred(taxOffice, _taxOffice);
        taxOffice = _taxOffice;
    }

    function setTaxCollectorAddress(address _taxCollectorAddress)
        public
        onlyOwnerOrTaxOffice
    {
        require(
            _taxCollectorAddress != address(0),
            "tax collector address must be non-zero address"
        );
        taxCollectorAddress = _taxCollectorAddress;
    }



    function excludeAddressFromTax(address account)
        external
        onlyOwnerOrTaxOffice
        returns (bool)
    {
        require(!_isExcluded[account], "Account is already excluded");
        _isExcluded[account] = true;
        return true;
    }

    function includeAddressInTax(address account)
        external
        onlyOwnerOrTaxOffice
        returns (bool)
    {
        require(_isExcluded[account], "Account is already included");
        _isExcluded[account] = false;
        return true;
    }

    function isExcluded(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function setTaxThreshold(uint256 _taxThreshold)
        public
        onlyOwnerOrTaxOffice
        returns (bool)
    {
        taxThreshold = _taxThreshold;
        return true;
    }

    function setBurnThreshold(uint256 _burnThreshold)
        public
        onlyOwnerOrTaxOffice
        returns (bool)
    {
        burnThreshold = _burnThreshold;
        return true;
    }

    function setStaticTaxRate(uint16 _staticTaxRate)
        public
        onlyOwnerOrTaxOffice
    {
        require(staticTaxRate < 2500, "Tax rates are too high. ");
        staticTaxRate = _staticTaxRate;
    }

    function setBasisTaxRate(uint16 _basisTaxRate) public onlyOwnerOrTaxOffice {
        require(basisTaxRate < 300, "basis tax rates should be only few. ");
        basisTaxRate = _basisTaxRate;
    }

    function setMaxTaxRate(uint16 _maxTaxRate) public onlyOwnerOrTaxOffice {
        require(_maxTaxRate < 5000, "Tax rates are too high.");
        maxTaxRate = _maxTaxRate;
    }

    function setAdjustTaxRateA(uint32 _adjustTaxRate)
        public
        onlyOwnerOrTaxOffice
    {
        // for adjustmentA
        adjustTaxRateA = _adjustTaxRate;
    }

    function setAdjustTaxRateB(uint32 _adjustTaxRate)
        public
        onlyOwnerOrTaxOffice
    {
        // for adjustmentB
        adjustTaxRateB = _adjustTaxRate;
    }

    event TaxOfficeTransferred(address oldAddress, address newAddress);
}

File 4 of 20 : ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

File 5 of 20 : Ownable.sol
// SPDX-License-Identifier: MIT

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() {
        _setOwner(_msgSender());
    }

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

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 6 of 20 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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 (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

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

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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 a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

File 7 of 20 : CoffinOracle.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IUniswapV2Router02.sol";
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapLP.sol";
import "./libs/FixedPoint.sol";
import "./interfaces/IBandStdReference.sol";


interface ICoffinOracle {
    function PERIOD() external view returns (uint32);
    function getCOFFINUSD() external view returns (uint256, uint8);
    function updateTwap(address token0, address token1) external ;
    function getCOUSDUSD() external view returns (uint256, uint8);
    function getTwapCOUSDUSD() external view returns (uint256, uint8);
    function getTwapCOFFINUSD() external view returns (uint256, uint8);
    function getTwapXCOFFINUSD() external view returns (uint256, uint8);
    function updateTwapDollar() external ;
    function updateTwapCoffin() external ;
    function updateTwapXCoffin() external ;
    function getXCOFFINUSD() external view returns (uint256, uint8);
    function getCOUSDFTM() external view returns (uint256, uint8);
    function getXCOFFINFTM() external view returns (uint256, uint8);
    function getCOFFINFTM() external view returns (uint256, uint8);
    function getFTMUSD() external view returns (uint256, uint8);

}

contract MockCoffinOracle is ICoffinOracle, Ownable {
    uint256 public xcoffinftm = (1 / 2) * 1 * 10**18;
    uint256 public coffinftm = 2 * 1 * 10**18;
    uint256 public ftmusd = (1 / 4) * 1 * 10**18;
    uint256 public cousdftm = (101 / 100) * 4 * 1 * 10**18;
    uint32 public override PERIOD = 600; // 10-minute TWAP 

    function updateTwap(address token0, address token1) external override {

    }
    function updateTwapDollar() external override{

    }
    function updateTwapCoffin() external override{

    }
    function updateTwapXCoffin() external override{

    }
    function setCOUSDFTM(uint256 val) external {
        cousdftm = val;
    }

    function getCOUSDFTM() public view override returns (uint256, uint8) {
        return (cousdftm, 18);
    }

    function setXCOFFINFTM(uint256 val) external {
        xcoffinftm = val;
    }

    function getXCOFFINFTM() public view override returns (uint256, uint8) {
        return (xcoffinftm, 18);
    }

    function setCOFFINFTM(uint256 val) external {
        coffinftm = val;
    }

    function getCOFFINFTM() public view override returns (uint256, uint8) {
        return (coffinftm, 18);
    }

 
    uint256 public cousdusd = 1030000000000000000;
    function setCOUSDUSD(uint256 val) external {
        cousdusd = val;// decimal 18 
    }
    function getCOUSDUSD() public view override returns(uint256,uint8){
        return (cousdusd,18);// decimal 18 
    }
    
 
    
    function setFTMUSD(uint256 val) external {
        ftmusd = val;
    }

    function getFTMUSD() public view override returns (uint256, uint8) {
        return (ftmusd, 18);
    }


    function getCOFFINUSD() public view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getXCOFFINUSD() public view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOUSDUSD() external view override returns (uint256, uint8){
        return getCOUSDUSD();
    }
    function getTwapCOFFINUSD() external view override returns (uint256, uint8){
        return getCOFFINUSD();
    }
    function getTwapXCOFFINUSD() external view override returns (uint256, uint8){
        return getXCOFFINUSD();
    }

}


contract CoffinOracle is ICoffinOracle, Initializable,Ownable {
    using SafeMath for uint256;
    using FixedPoint for *;

    IUniswapV2Router02 public uniswapv2router;
    address public coffin;
    address public dollar;
    address public xcoffin;
    address public wftm = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;
    address public usdc = 0x04068DA6C83AFCFA0e13ba15A6696662335D5B75;
    address public dai = 0x8D11eC38a3EB5E956B052f67Da8Bdc9bef8Abf3E;
    address public boo = 0x841FAD6EAe12c286d1Fd18d1d525DFfA75C7EFFE;
    IBandStdReference bandRef;
    uint32 public override PERIOD = 600; // 10-minute TWAP

    struct Pair {
        uint256 price0CumulativeLast;
        uint256 price1CumulativeLast;
        uint32 blockTimestampLast;
        FixedPoint.uq112x112 price0Average;
        FixedPoint.uq112x112 price1Average;
        bool initialized;
    }

    mapping(address => Pair) public getPair;

    function setPeriod(uint32 _period) external onlyOwner {
        PERIOD = _period;
    }

    function init(
        address _coffinAddress,
        address _cousdAddress,
        address _xcoffinAddress
    ) external  initializer onlyOwner{
        // router address. it's spooky router by default. 
        address routerAddress = 0xF491e7B69E4244ad4002BC14e878a34207E38c29;
        setRouter(routerAddress);

        address fantomBandProtocol = 0x56E2898E0ceFF0D1222827759B56B28Ad812f92F;

        setBandOracle(fantomBandProtocol);
        setCOFFINAddress(_coffinAddress);
        setDollarAddress(_cousdAddress);
        setXCOFFINAddress(_xcoffinAddress);
    }

    function getBandRate(string memory token0, string memory token1)
        public
        view
        returns (uint256)
    {
        IBandStdReference.ReferenceData memory data = bandRef.getReferenceData(
            token0,
            token1
        );
        return data.rate;
    }


    function getFTMUSD() public view override returns (uint256, uint8) {
        return (getBandRate("FTM","USD"), 18);
    }

    



    function setCOFFINAddress(address _coffinAddress) public onlyOwner {
        coffin = _coffinAddress;
    }

    function setXCOFFINAddress(address _xcoffinAddress) public onlyOwner {
        xcoffin = _xcoffinAddress;
    }

    function setDollarAddress(address _cousdAddress) public onlyOwner {
        dollar = _cousdAddress;
    }

    function setRouter(address _uniswapv2routeraddress)
        public
        onlyOwner
    {
        uniswapv2router = IUniswapV2Router02(_uniswapv2routeraddress);
    }

    function setBandOracle(address _bandOracleAddress) public onlyOwner {
        bandRef = IBandStdReference(_bandOracleAddress);
    }


    function getCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getTwapCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }
    
    function getUSDCUSD() public view  returns (uint256, uint8) {
        return (getBandRate("USDC","USD"), 18);
    }
    function getDAIUSD() public view  returns (uint256, uint8) {
        return (getBandRate("DAI","USD"), 18);
    }
    
    uint8 public oracleMode = 0; 

    function enableFTMOracle() external onlyOwner {
        oracleMode = 1;
    }
    function enableDAIOracle() external onlyOwner {
        oracleMode = 2 ;
    }
    function enableUSDCracle() external onlyOwner {
        oracleMode = 0 ;
    }

    function getCOUSDUSD() external view override returns (uint256, uint8) {
        if (oracleMode==1) {
            (uint256 v1, uint8 d1) = getCOUSDFTM();
            (uint256 v2, uint8 d2) = getFTMUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else if (oracleMode==2) {
            (uint256 v1, uint8 d1) = getCOUSDDAI();
            (uint256 v2, uint8 d2) = getDAIUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else {
            (uint256 v1, uint8 d1) = getCOUSDUSDC();
            (uint256 v2, uint8 d2) = getUSDCUSD();
            return ((v1 * v2) / (10**d1), d2);
        }
    }

    function getTwapCOUSDUSD() external view override returns (uint256, uint8) {
        if (oracleMode==1) {
            (uint256 v1, uint8 d1) = getTwapCOUSDFTM();
            (uint256 v2, uint8 d2) = getFTMUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else if (oracleMode==2) {   
            (uint256 v1, uint8 d1) = getTwapCOUSDDAI();
            (uint256 v2, uint8 d2) = getDAIUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else {
            (uint256 v1, uint8 d1) = getTwapCOUSDUSDC();
            (uint256 v2, uint8 d2) = getUSDCUSD();
            return ((v1 * v2) / (10**d1), d2);     
        }

    }

    
    


    function getXCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapXCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getTwapXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOUSDFTM() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,wftm);
    }
    
    function getTwapCOUSDDAI() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,dai);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,usdc);
    }
    function getTwapCOUSDUSDC() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,usdc);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,usdc);
    }
    
    function getCOUSDFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(dollar,wftm);
    }
    function getCOUSDUSDC() public view returns (uint256, uint8) {
        return getRealtimeRate(dollar,usdc);
    }
    function getCOUSDDAI() public view returns (uint256, uint8) {
        return getRealtimeRate(dollar,dai);
    }
    

    function getTwapXCOFFINFTM() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(xcoffin,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(xcoffin,wftm);
    }

    function getXCOFFINFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(xcoffin,wftm);
    }

    function getTwapCOFFINFTM() public view returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(coffin,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(coffin,wftm);
    }
    function getCOFFINFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(coffin,wftm);
    }


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

    function currentCumulativePrices(address uniswapV2Pair)
        internal
        view
        returns (
            uint256 price0Cumulative,
            uint256 price1Cumulative,
            uint32 blockTimestamp
        )
    {
        // Pair storage pairStorage = getPair[uniswapV2Pair];

        blockTimestamp = currentBlockTimestamp();
        IUniswapLP uniswapPair = IUniswapLP(uniswapV2Pair);
        price0Cumulative = uniswapPair.price0CumulativeLast();
        price1Cumulative = uniswapPair.price1CumulativeLast();

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 _blockTimestampLast) = uniswapPair.getReserves();
        if (_blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint32 timeElapsed = blockTimestamp - _blockTimestampLast;
            // addition overflow is desired
            // counterfactual
            price0Cumulative += uint256(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
            // counterfactual
            price1Cumulative += uint256(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
        }
    }


    function getTwapRate(address token0, address token1)
        public
        view
        returns (uint256 priceLatest, uint8 decimals)
    {
        address[] memory path = new address[](2);
        path[0] = token0;
        path[1] = token1;
        address factory = address(uniswapv2router.factory());
        address uniswapV2Pair = IUniswapV2Factory(factory).getPair(token0, token1);

        if (uniswapV2Pair== address(0)) {
            return (0,0);
        } 

        // Pair memory pair = getPair[uniswapV2Pair];
        Pair storage pairStorage = getPair[uniswapV2Pair];

        // require(pairStorage.initialized, "need to setup first");
        if (!pairStorage.initialized) {
            return getRealtimeRate(token0, token1);
            // return (0,0);
        }
        
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) = currentCumulativePrices(
            address(uniswapV2Pair)
        );
        uint32 timeElapsed = blockTimestamp - pairStorage.blockTimestampLast; // Overflow is desired

        FixedPoint.uq112x112 memory price0Average 
            = FixedPoint.uq112x112(uint224((price0Cumulative - pairStorage.price0CumulativeLast) / timeElapsed));
        FixedPoint.uq112x112 memory price1Average 
            = FixedPoint.uq112x112(uint224((price1Cumulative - pairStorage.price1CumulativeLast) / timeElapsed));

        uint256 amountIn = 1e18;
        if (IUniswapLP(uniswapV2Pair).token0() == token0) {
            priceLatest = uint256(price0Average.mul(amountIn).decode144());
            decimals = ERC20(token1).decimals();
        } else {
            require(IUniswapLP(uniswapV2Pair).token0() == token1, "TwapOracle: INVALID_TOKEN");
            priceLatest = uint256(price1Average.mul(amountIn).decode144());
            decimals = ERC20(token0).decimals();
        }
    }

    function getTwapRateWithUpdate(address token0, address token1)
        external
        returns (uint256 priceLatest, uint8 decimals)
    {
        updateTwap(token0,token1);
        return getTwapRate(token0,token1);
    }
    

    function updateTwapDollarFTM() public  {
        updateTwap(dollar, wftm);
    }
    function updateTwapDollar() public override {
        updateTwap(dollar, dai);
    }
    function updateTwapDollarUSDC() public  {
        updateTwap(dollar, usdc);
    }
    function updateTwapCoffin() public override {
        updateTwap(coffin, wftm);
    }
    function updateTwapXCoffin() public override {
        updateTwap(xcoffin, wftm);
    }

    function updateTwap(address token0, address token1) public override {

        address[] memory path = new address[](2);
        path[0] = token0;
        path[1] = token1;
        address factory = address(uniswapv2router.factory());
        address uniswapV2Pair = IUniswapV2Factory(factory).getPair(token0, token1);

        if (uniswapV2Pair== address(0)) {
            return;
        }
        Pair storage pairStorage = getPair[uniswapV2Pair];
        // require(pairStorage.initialized, "need to setup first");
        
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) = currentCumulativePrices(
            address(uniswapV2Pair)
        );

        if (!pairStorage.initialized) {
            // first time 
            pairStorage.price0CumulativeLast = price0Cumulative;
            pairStorage.price1CumulativeLast = price1Cumulative;
            pairStorage.blockTimestampLast = blockTimestamp;
            pairStorage.initialized = true;
            return;
        }

        // Overflow is desired
        uint32 timeElapsed = blockTimestamp - pairStorage.blockTimestampLast; 
        
        // Ensure that at least one full period has passed since the last update
        if (timeElapsed < PERIOD) {
            return ;
        }
        
        pairStorage.price0Average 
            = FixedPoint.uq112x112(uint224((price0Cumulative - pairStorage.price0CumulativeLast) / timeElapsed));
        pairStorage.price1Average 
            = FixedPoint.uq112x112(uint224((price1Cumulative - pairStorage.price1CumulativeLast) / timeElapsed));
        pairStorage.price0CumulativeLast = price0Cumulative;
        pairStorage.price1CumulativeLast = price1Cumulative;
        pairStorage.blockTimestampLast = blockTimestamp;
    }

    function getRealtimeRate(address tokenA, address tokenB)
        public
        view
        returns (uint256 priceLatest, uint8 decimals)
    {

        address factory = address(uniswapv2router.factory());
        address pair = IUniswapV2Factory(factory).getPair(tokenA, tokenB);
        if (pair== address(0)) {
            return (0,0);
        }
        
        (uint112 reserve0, uint112 reserve1,) =
            IUniswapLP(pair).getReserves();
        if (IUniswapLP(pair).token0()==address(tokenA)) {
            priceLatest = uint256(reserve1).mul(uint256(10**ERC20(tokenA).decimals())).div(uint256(reserve0));
            decimals = ERC20(tokenB).decimals();
        } else {
            priceLatest = uint256(reserve0).mul(uint256(10**ERC20(tokenA).decimals())).div(uint256(reserve1));
            decimals = ERC20(tokenB).decimals();
        }

        if ((18-decimals)>0) { 
            priceLatest = priceLatest.mul(10**(18-decimals));
            decimals = 18;
        }
    }
}

File 8 of 20 : PoolToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";

contract PoolToken is ERC20Burnable , Ownable{
    using SafeMath for uint256;

    // The addresses in this array are added by the oracle and these contracts are able to mint coffin
    address[] public coffin_pools_array;

    // Mapping is also used for faster verification
    mapping(address => bool) public coffin_pools; 

    /* ========== MODIFIERS ========== */

    modifier onlyPools() {
        require(coffin_pools[msg.sender] == true, "Only coffin pools can call this function");
        _;
    }
    

    modifier onlyByOwnerOrPool() {
        require(
            msg.sender == owner()
            || coffin_pools[msg.sender] == true, 
            "You are not the owner, or a pool");
        _;
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /* ========== constructor ========== */
    constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {}
    /* ========== view ========== */
    function poolLength() view public returns(uint256) {
        return coffin_pools_array.length;
    }

    /* ========== onlyPools ========== */

    // Used by pools when user redeems
    function pool_burn_from(address addr, uint256 amount) public onlyPools {
        super.burnFrom(addr, amount);
        emit Burned(addr, msg.sender, amount);
    }
    // This function is what other pools will call to mint new token 
    function pool_mint(address addr, uint256 amount) public onlyPools {
        super._mint(addr, amount);
        emit Minted(msg.sender, addr, amount);
    }

    /* ========== onlyOwner  ========== */

    // 
    function burnFrom(address addr, uint256 amount) public override onlyOwner {
        super.burnFrom(addr, amount);
        emit Minted(msg.sender, addr, amount);
    }
    
    // pools which can mint/burn 
    function addPool(address pool_address) public onlyOwner {
        require(pool_address != address(0), "Zero address detected");

        require(coffin_pools[pool_address] == false, "Address already exists");
        coffin_pools[pool_address] = true; 
        coffin_pools_array.push(pool_address);

        emit PoolAdded(pool_address);
    }

    // Remove a pool 
    function removePool(address pool_address) public onlyOwner {
        require(pool_address != address(0), "Zero address detected");
        require(coffin_pools[pool_address] == true, "Address nonexistant");
        
        // Delete from the mapping
        delete coffin_pools[pool_address];

        // 'Delete' from the array by setting the address to 0x0
        for (uint i = 0; i < coffin_pools_array.length; i++){ 
            if (coffin_pools_array[i] == pool_address) {
                coffin_pools_array[i] = address(0); // This will leave a null in the array and keep the indices the same
                break;
            }
        }

        emit PoolRemoved(pool_address);
    }

    /* ========== EVENTS ========== */


    event Burned(address indexed from, address indexed by, uint256 amount);
    event Minted(address indexed from, address indexed to, uint256 amount);
    event PoolAdded(address pool_address);
    event PoolRemoved(address pool_address);

}

File 9 of 20 : Babylonian.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

// computes square roots using the babylonian method
// https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
library Babylonian {
    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;
        }
        // else z = 0
    }
}

File 10 of 20 : ITaxableTokenPolicy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

    
interface ITaxableTokenPolicy  {
    function calcTaxRate(
        uint256 dollarPrice, 
        uint256 taxThreshold, 
        uint256 paramA, 
        uint256 paramB, 
        uint256 basisTaxRate,
        uint256 maxTaxRate
    ) external pure returns (uint16) ;
    }

File 11 of 20 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

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

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

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

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

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

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

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

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

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

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

File 12 of 20 : Context.sol
// SPDX-License-Identifier: MIT

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;
    }
}

File 13 of 20 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

File 14 of 20 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 15 of 20 : IUniswapV2Router02.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

import "./IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

}

File 16 of 20 : IUniswapV2Factory.sol
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.7;
interface IUniswapV2Factory {

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

File 17 of 20 : IUniswapLP.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.7;
pragma experimental ABIEncoderV2;

interface IUniswapLP {
    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);

    function getTokenWeights() external view returns (uint32 tokenWeight0, uint32 tokenWeight1);
}

File 18 of 20 : FixedPoint.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "./Babylonian.sol";

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = uint256(1) << RESOLUTION;
    uint256 private constant Q224 = Q112 << RESOLUTION;

    // encode a uint112 as a UQ112x112
    function encode(uint112 x) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(x) << RESOLUTION);
    }

    // encodes a uint144 as a UQ144x112
    function encode144(uint144 x) internal pure returns (uq144x112 memory) {
        return uq144x112(uint256(x) << RESOLUTION);
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
        require(x != 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112(self._x / uint224(x));
    }

    // multiply a UQ112x112 by a uint, returning a UQ144x112
    // reverts on overflow
    function mul(uq112x112 memory self, uint256 y) internal pure returns (uq144x112 memory) {
        uint256 z;
        require(y == 0 || (z = uint256(self._x) * y) / y == uint256(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
        return uq144x112(z);
    }

    // returns a UQ112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
    }

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a UQ144x112 into a uint144 by truncating after the radix point
    function decode144(uq144x112 memory self) internal pure returns (uint144) {
        return uint144(self._x >> RESOLUTION);
    }

    // take the reciprocal of a UQ112x112
    function reciprocal(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        require(self._x != 0, "FixedPoint: ZERO_RECIPROCAL");
        return uq112x112(uint224(Q224 / self._x));
    }

    // square root of a UQ112x112
    function sqrt(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(Babylonian.sqrt(uint256(self._x)) << 56));
    }
}

File 19 of 20 : IBandStdReference.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IBandStdReference {
    /// A structure returned whenever someone requests for standard reference data.
    struct ReferenceData {
        uint256 rate; // base/quote exchange rate, multiplied by 1e18.
        uint256 lastUpdatedBase; // UNIX epoch of the last time when base price gets updated.
        uint256 lastUpdatedQuote; // UNIX epoch of the last time when quote price gets updated.
    }

    /// Returns the price data for the given base/quote pair. Revert if not available.
    function getReferenceData(string memory _base, string memory _quote)
        external
        view
        returns (ReferenceData memory);
    
    /// Similar to getReferenceData, but with multiple base/quote pairs at once.
    function getReferenceDataBulk(
        string[] memory _bases,
        string[] memory _quotes
    ) external view returns (ReferenceData[] memory);
}

File 20 of 20 : IUniswapV2Router01.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IUniswapV2Router01 {
    function factory() external view   returns (address);
    function WETH() external view  returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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