Automation script

const { ethers } = require('ethers');
const { ChainId, Token, Fetcher, Route, Trade, TradeType } = require('@uniswap/sdk');
const { abi: IERC20ABI } = require("@openzeppelin/contracts/build/contracts/IERC20.json");
const { abi: ILendingPoolABI } = require("@aave/protocol-v2/contracts/interfaces/ILendingPool.json");
const { abi: IUniswapV2Router02ABI } = require("@uniswap/v2-periphery/build/IUniswapV2Router02.json");
const { abi: AggregatorV3InterfaceABI } = require("@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.json");

// Ethereum RPC URL and private key
const rpcURL = "YOUR_RPC_URL";
const privateKey = "YOUR_PRIVATE_KEY";

// Contract addresses
const lendingPoolAddress = "YOUR_LENDING_POOL_ADDRESS";
const uniswapRouterAddress = "YOUR_UNISWAP_ROUTER_ADDRESS";
const priceOracleAddress = "YOUR_PRICE_ORACLE_ADDRESS";

// Slippage tolerance, trade deadline, and minimum trade size
const slippageTolerance = 1; // 1% slippage
const tradeDeadline = 600; // 10 minutes
const minTradeSize = 100; // Minimum trade size in tokenA

// Initialize provider and wallet
const provider = new ethers.providers.JsonRpcProvider(rpcURL);
const wallet = new ethers.Wallet(privateKey, provider);

// Contract instances
const lendingPool = new ethers.Contract(lendingPoolAddress, ILendingPoolABI, wallet);
const uniswapRouter = new ethers.Contract(uniswapRouterAddress, IUniswapV2Router02ABI, wallet);
const priceOracle = new ethers.Contract(priceOracleAddress, AggregatorV3InterfaceABI, wallet);

// Main function
async function main() {
    try {
        const arbitrageOpportunity = await findArbitrageOpportunity();
        if (arbitrageOpportunity) {
            await executeArbitrageTrade(arbitrageOpportunity);
        } else {
            console.log("No arbitrage opportunity found");
        }
    } catch (error) {
        console.error("Error executing arbitrage bot:", error);
    }
}

// Find arbitrage opportunity
async function findArbitrageOpportunity() {
    const tokens = await Fetcher.fetchTokenData(ChainId.MAINNET);
    const pairs = [];
    for (let i = 0; i < tokens.length; i++) {
        for (let j = i + 1; j < tokens.length; j++) {
            const pair = await Fetcher.fetchPairData(tokens[i], tokens[j]);
            pairs.push(pair);
        }
    }
    for (const pair of pairs) {
        const profit = await calculateProfit(pair);
        if (profit.gt(0)) return pair;
    }
    return null;
}

// Execute arbitrage trade
async function executeArbitrageTrade(arbitrageOpportunity) {
    const tokenA = new ethers.Contract(arbitrageOpportunity.token0.address, IERC20ABI, wallet);
    const tokenB = new ethers.Contract(arbitrageOpportunity.token1.address, IERC20ABI, wallet);
    const amount = ethers.utils.parseUnits(minTradeSize.toString(), arbitrageOpportunity.token0.decimals);
    await tokenA.approve(uniswapRouter.address, ethers.constants.MaxUint256);
    const amountsOut = await uniswapRouter.getAmountsOut(amount, [arbitrageOpportunity.token0.address, arbitrageOpportunity.token1.address]);
    const amountOutMin = amountsOut[1].sub(amountsOut[1].mul(slippageTolerance).div(100));
    const deadline = Math.floor(Date.now() / 1000) + tradeDeadline;
    await uniswapRouter.swapExactTokensForTokens(amount, amountOutMin, [arbitrageOpportunity.token0.address, arbitrageOpportunity.token1.address], wallet.address, deadline);
    await repayFlashLoan(tokenA, amount);
    console.log("Arbitrage trade executed");
}

// Calculate profit for a token pair
async function calculateProfit(pair) {
    const [tokenA, tokenB] = pair.getOutputAmount(new TokenAmount(pair.tokenAmounts[0].token, minTradeSize));
    const tokenAContract = new ethers.Contract(tokenA.token.address, IERC20ABI, wallet);
    const tokenBContract = new ethers.Contract(tokenB.token.address, IERC20ABI, wallet);
    const priceA = await fetchTokenPrice(tokenA.token);
    const priceB = await fetchTokenPrice(tokenB.token);
    const profit = tokenA.amount.mul(priceA).div(priceB).sub(tokenA.amount);
    return profit;
}

// Fetch token price from Chainlink oracle
async function fetchTokenPrice(token) {
    const priceFeed = new ethers.Contract(token.priceFeedAddress, AggregatorV3InterfaceABI, wallet);
    const latestPrice = await priceFeed.latestRoundData();
    return latestPrice[1];
}

// Repay flash loan
async function repayFlashLoan(token, amount) {
    await token.approve(lendingPool.address, ethers.constants.MaxUint256);
    await lendingPool.repay(token.address, amount, 2, wallet.address);
    console.log("Flash loan repaid");
}

// Run the main function
main();