Arbitrage.sol

Arbitrage.sol

pragma solidity ^0.6.12;

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);
}

interface IMySwapRouter {
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        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 getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
}

contract Arbitrage {
    
    address public nickRouter;
    address public dreamRouter;
    
    address public busd;
    address public wbnb;
    
    constructor() public {
        nickRouter = address(0x4012d79E02C3BE34552B835E8F4736cBaFfa121D);
        dreamRouter = address(0x05cf160b080348CC35A0CF331e0e5811E5310a2A);
        busd = address(0xB760bDf88a3ABfa4fa5D1217b8AaEe7893A6ecEB);
        wbnb = address(0xB8c703826dC26B8dfb2d4F2AA4652A430c363212);
    }
    
    function arbritageLogic(uint256 amountBUSD) external { // amount of BUSD
        uint256 amountBNB = swapAtNickRouter(amountBUSD);
        swapAtDreamRouter(amountBNB);
    }
    
    function swapAtNickRouter(uint256 amount) public returns(uint256) { // SWAP 1 BUSD -> 0.098 WBNB => ถูกกว่า
        
        address[] memory path = new address[](2);
        
        path[0] = address(busd);
        path[1] = address(wbnb);
        
        uint amountOutMin = IMySwapRouter(nickRouter).getAmountsOut(
            amount,
            path
        )[1];
        
        IERC20(busd).approve(address(nickRouter),amount);
        
        uint256[] memory amounts = IMySwapRouter(nickRouter).swapExactTokensForTokens(
            amount,
            amountOutMin,
            path,
            address(this),
            block.timestamp
        );
        
        uint256 amountWbnb = amounts[1];
        return amountWbnb;
    }
    
    function swapAtDreamRouter(uint256 amountBNB) public { // SWAP 1 BUSD -> 0.096 WBNB
        
        address[] memory path = new address[](2);
        
        path[0] = address(wbnb);
        path[1] = address(busd);
        
        uint amountOutMin = IMySwapRouter(dreamRouter).getAmountsOut(
            amountBNB,
            path
        )[1];
        
        IERC20(wbnb).approve(address(dreamRouter),amountBNB);
        IMySwapRouter(dreamRouter).swapExactTokensForTokens(
            amountBNB,
            amountOutMin,
            path,
            address(this),
            block.timestamp
        );
    }
    
    function transferBUSD(address _to) public {
        uint _balance = IERC20(busd).balanceOf(address(this));
        IERC20(busd).transfer(_to, _balance);
    }
}