Untitled

const ethers = require("ethers");
const { FlashbotsBundleProvider } = require("@flashbots/ethers-provider-bundle");

// Replace with your Infura URL
const INFURA_URL = "<INFURA_URL>";
// Replace with your private key
const PRIVATE_KEY = "<PRIVATE_KEY>";
// Replace with the address of the swap contract
const SWAP_CONTRACT_ADDRESS = "<SWAP_CONTRACT_ADDRESS>";
// Replace ERC20_ABI with the ABI you provided
const ERC20_ABI = '[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"PAUSED","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"togglePause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]';
// Replace with your desired minimum liquidity
const MIN_LIQUIDITY = 100000;

async function getPrice(tokenContract) {
  // Assume there is a function named "getPrice" in the contract ABI
  const price = await tokenContract.getPrice();
  return price;
}

async function getLiquidity(tokenContract) {
  // Assume there is a function named "getLiquidity" in the contract ABI
  const liquidity = await tokenContract.getLiquidity();
  return liquidity;
}

async function getMinOutput(tokenAddress, inputAmount) {

  const slippagePercentage = 0.01; // 1% slippage

  // Get the token contract
  const tokenContract = new ethers.Contract(tokenAddress, ERC20_ABI, provider);

  // Get the token price and liquidity
  const tokenPrice = await getPrice(tokenContract);
  const tokenLiquidity = await getLiquidity(tokenContract);

  // Calculate the minimum output amount based on slippage
  const minOutputAmount = ethers.utils.parseEther(inputAmount.toString())
    .mul(ethers.utils.parseEther("1").sub(slippagePercentage))
    .div(tokenPrice)
    .div(ethers.utils.parseEther("1").sub(slippagePercentage))
    .toString();
    
  return minOutputTokenAmount;
}

async function checkForArbitrageOpportunity(swapTransaction) {
  const ArbitrageProvider = new ethers.providers.JsonRpcProvider(INFURA_URL);

  // Decode the transaction data to get the function name and arguments
  const decodedData = ethers.utils.defaultAbiCoder.decode(
    ["address", "uint256", "uint256", "address", "uint256"],
    "0x" + swapTransaction.data
  );

  // Assume this is a swap transaction in a typical DEX
  const inputTokenAddress = decodedData[0];
  const outputTokenAddress = decodedData[3];
  const inputTokenAmount = decodedData[1];
  const minOutputTokenAmount = decodedData[2]; // this can be used to estimate slippage

  // Get the token contracts
  const provider = new ethers.providers.JsonRpcProvider(INFURA_URL);
  const inputTokenContract = new ethers.Contract(inputTokenAddress, ERC20_ABI, provider);
  const outputTokenContract = new ethers.Contract(outputTokenAddress, ERC20_ABI, provider);

  // Get the token prices, liquidity, etc.
  // For the sake of example, we assume some functions getPrice and getLiquidity
  const inputTokenPrice = await getPrice(inputTokenContract);
  const outputTokenPrice = await getPrice(outputTokenContract);
  const inputTokenLiquidity = await getLiquidity(inputTokenContract);
  const outputTokenLiquidity = await getLiquidity(outputTokenContract);

  // Check the size of the transaction
  // You may set your own conditions for minimum or maximum transaction sizes
  const MIN_TX_SIZE = ethers.utils.parseEther("0.1");
  const MAX_TX_SIZE = ethers.utils.parseEther("10");

  if (ethers.utils.formatEther(inputTokenAmount) < MIN_TX_SIZE || ethers.utils.formatEther(inputTokenAmount) > MAX_TX_SIZE) {
    return false;
  }

  // Check the liquidity of the token being traded
  if (inputTokenLiquidity < MIN_LIQUIDITY || outputTokenLiquidity < MIN_LIQUIDITY) {
    return false;
  }

  // Estimating the price impact of your own trades is complex and would depend on the specific market you're operating in
  // As a simple rule, if the transaction size is more than a small percentage of the liquidity, it could significantly impact the price

  // Estimate the gas cost
  // This will depend on the current gas price and the complexity of your transactions
  // You can use provider.getGasPrice() to get the current gas price
  const gasPrice = await provider.getGasPrice();
  const gasCost = gasPrice.mul(swapTransaction.gasLimit);

  // Check if the profit from price difference outweighs the gas cost
  const profit = (inputTokenPrice - outputTokenPrice) * ethers.utils.formatEther(inputTokenAmount) - ethers.utils.formatEther(gasCost);
  if (profit <= 0) {
    return false;
  }

  // If all checks pass, return true
  return true;
}

async function createSandwichTransactions(swapTransaction) {
  // Define your wallet
  const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
  
  // Define the swap contract you want to interact with

// Replace ERC20_ABI with the ABI you provided
const SWAP_CONTRACT_ABI = [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"PAUSED","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}]}];

  const swapContract = new ethers.Contract(SWAP_CONTRACT_ADDRESS, SWAP_CONTRACT_ABI, wallet);
  
  // Decode swapTransaction data
  const decodedData = ethers.utils.defaultAbiCoder.decode(
    ["address", "uint256", "uint256", "address", "uint256"],
    "0x" + swapTransaction.data
  );
  
  const inputTokenAddress = decodedData[0];
  const outputTokenAddress = decodedData[3];
  const inputTokenAmount = decodedData[1];
  const minOutputTokenAmount = decodedData[2];
  
  // First transaction: mirror the target transaction
  const firstTx = swapContract.populateTransaction.swapExactTokensForTokens(
    inputTokenAmount,
    await getMinOutput(outputTokenAddress, inputTokenAmount),
    [inputTokenAddress, outputTokenAddress], // the path of the swap
    wallet.address,
    ethers.constants.MaxUint256
  );
  
  // Second transaction: reverse the trade
  const secondTx = swapContract.populateTransaction.swapExactTokensForTokens(
    minOutputTokenAmount,
    await getMinOutput(inputTokenAddress, minOutputTokenAmount),
    [outputTokenAddress, inputTokenAddress], // the path of the swap
    wallet.address,
    ethers.constants.MaxUint256
  );
  
  // Set other transaction parameters
  // Note that the gas price should be slightly higher than the one for the target transaction
  const gasPrice = await provider.getGasPrice();
  const gasLimit = ethers.BigNumber.from("210000"); // this should be estimated based on the actual transaction complexity
  
  firstTx.gasPrice = gasPrice.mul(11).div(10); // 10% higher than the current gas price
  firstTx.gasLimit = gasLimit;
  
  secondTx.gasPrice = gasPrice.mul(11).div(10); // 10% higher than the current gas price
  secondTx.gasLimit = gasLimit;
  
  // Return the pair of transactions
  return [firstTx, secondTx];
}


async function monitorMempool() {
  const mempoolProvider = new ethers.providers.JsonRpcProvider(INFURA_URL);
  const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
  const flashbotsProvider = await FlashbotsBundleProvider.create(provider, wallet);

  provider.on("pending", async (tx) => {
    const transaction = await provider.getTransaction(tx);

    if (await checkForArbitrageOpportunity(transaction)) {
      const sandwichTransactions = await createSandwichTransactions(transaction);

      let blockNumber = await provider.getBlockNumber();

      while (true) {
        try {
          const bundleSubmission = await flashbotsProvider.sendBundle(
            [
              { signer: wallet, transaction: sandwichTransactions[0] },
              transaction,
              { signer: wallet, transaction: sandwichTransactions[1] },
            ],
            blockNumber + 1
          );

          if ("error" in bundleSubmission) {
            console.log(`Bundle submission error: ${bundleSubmission.error.message}`);
          } else {
            console.log(`Bundle submitted successfully: ${bundleSubmission.bundleHash}`);
          }

          break; // Exit the loop after successful bundle submission
        } catch (error) {
          // Handle reorganizations
          if (error.message.includes("reverted: orphan")) {
            blockNumber = await provider.getBlockNumber();
            continue; // Retry with the updated block number
          }

          console.error("Bundle submission error:", error);
          break; // Exit the loop on other errors
        }
      }
    }
  });
  provider.on("close", () => {
    // Reconnect logic here
  });

  try {
    await provider.send("eth_subscribe", ["newHeads"]);
  } catch (error) {
    console.error("Error:", error);
  }
  

}

monitorMempool();