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I'd be happy to help you create a simple MEV bot that monitors DEX trades for arbitrage opportunities. Here's a basic implementation:

const ethers = require('ethers');
require('dotenv').config();

// Set up provider and wallet
const provider = new ethers.providers.WebSocketProvider(
  process.env.WSS_ENDPOINT
);
const wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);

// DEX addresses and ABIs (simplified)
const dexes = [
  {
    name: 'Uniswap V2',
    router: '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D',
    factory: '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f',
  },
  // Add other DEXes here
];

async function monitorArbitrageOpportunities() {
  console.log('Starting MEV bot for arbitrage monitoring...');
  
  // Listen for swap events from DEXes
  const uniswapFactory = new ethers.Contract(
    dexes[0].factory,
    ['event PairCreated(address indexed token0, address indexed token1, address pair, uint)'],
    provider
  );
  
  // Listen for new trading pairs
  uniswapFactory.on('PairCreated', async (token0, token1, pairAddress) => {
    console.log(`New pair detected: ${token0} - ${token1}`);
    monitorPair(pairAddress, token0, token1);
  });
  
  // Setup listeners for existing pairs
  // Code to fetch and monitor existing pairs...
}

async function monitorPair(pairAddress, token0Address, token1Address) {
  const pairAbi = [
    'event Swap(address indexed sender, uint amount0In, uint amount1In, uint amount0Out, uint amount1Out, address indexed to)'
  ];
  
  const pairContract = new ethers.Contract(pairAddress, pairAbi, provider);
  
  pairContract.on('Swap', async (sender, amount0In, amount1In, amount0Out, amount1Out, to) => {
    try {
      // Check for arbitrage opportunity across different DEXes
      const opportunity = await checkArbitrageOpportunity(
        token0Address, 
        token1Address,
        amount0In, 
        amount1In, 
        amount0Out, 
        amount1Out
      );
      
      if (opportunity.profitable) {
        console.log('Arbitrage opportunity found!');
        // Execute the arbitrage
        await executeArbitrage(opportunity);
      }
    } catch (error) {
      console.error('Error processing swap event:', error);
    }
  });
}

async function checkArbitrageOpportunity(token0, token1, amount0In, amount1In, amount0Out, amount1Out) {
  // Compare prices across DEXes
  // Calculate potential profit
  // Return opportunity details if profitable
  
  // Placeholder logic
  return { profitable: false };
}

async function executeArbitrage(opportunity) {
  // Bundle transactions
  // Calculate gas costs
  // Execute if profitable after gas
  
  // Submit transaction
  // Code to execute the arbitrage...
}

// Start monitoring
monitorArbitrageOpportunities().catch(console.error);

This is a simplified version to get you started. For a production-ready MEV bot, you would need to add:

• Gas optimization strategies
• Flash loan integration for higher capital efficiency
• Slippage protection
• More sophisticated pricing algorithms

Would you like me to elaborate on any specific part of this implementation?