Buy ERC20 tokens privately on Uniswap V2. Don't forget to add a star here :)

ERC20PrivateBuy

const {ethers} = require("ethers");

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

const utils = require('./utils').utils;


const flashbotRpc = 'https://relay.flashbots.net';

/* --------------------- CHANGES ----------------- */
const rpc = 'https://mainnet.infura.io/v3/';
const relayPvtKey = '' // any private key (make sure it doesn't contain any asset. it's public. just choose random one)
const buyerPvtKey = ''; // buyer private key that contains some ETH to buy tokens


const buyers = [
  // '0x00001',
  // '0x00002',
  // '0x00003'
  // Any number of wallets that you are going to buy. It doesn't need to contain ETH, it's just wallet to receive bought tokens.
];

const tokenAddr = ''; // Token address to buy
const gasMultiplier = 1.1; // Gas price multiplier. If current gwei is 30, then it will send transactions with 33

const amountToPayMiner = 0.001; // Tip to miner to make your transaction private. You can choose whatever amount 0.00001, 0.00000001. 

const amountToBuy = 0.04; // Amount of ETH that you are going to buy for each account. total ETH u need in buyer wallet should be more than amountToBuy * buyers.length + gasPrice
const maxTx = 10; // if the token has max transaction limit or max wallet limit, set this. It's percentage value of TotalSupply

const gasLimitForBuy = 500000; // Gas limit, 500k is fine to buy.
const targetBlock = 2; // No need to change, you can just set what block you want your transaction to be confirmed.
const timeLimit = 120; // No need to chage, you can change this if 1 block generation time is more than 60 seconds. Generally 10 - 30 seconds
/* --------------------- CHANGES END ----------------- */

const aggregatorAddr = '0x4c1d5C67936a2419ECFD337690eFAe0F25F93553'; // Dex Aggregator address. no need to change

const wethAddr = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2'; // WETH address on Ethereum

const factoryAddr = '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f'; // Uniswap V2 Factory address

async function getGasPrice(provider) {
  return utils.hex(BigInt(await provider.getGasPrice()) * BigInt(gasMultiplier * 1000) / BigInt(1000));
}

const main = async function () {
  const provider = new ethers.providers.JsonRpcProvider({
    url: rpc,
  });
  const flashbotRelayowner = new ethers.Wallet(relayPvtKey);

  const flashbotsProvider = await FlashbotsBundleProvider.create(
    provider,
    flashbotRelayowner,
    flashbotRpc
  );

  const token = new ethers.Contract(tokenAddr, require('./abi/erc20.json'), provider);
  const aggregator = new ethers.Contract(aggregatorAddr, require('./abi/aggregator.json'), provider);

  const gasPrice = await getGasPrice(provider);

  console.log('gasPrice', utils.formatBalance(gasPrice, 9));
  
  const signer = new ethers.Wallet(buyerPvtKey, provider);
  const tSupply = await token.connect(signer).totalSupply();

  console.log('totalSupply', tSupply);

  const buyTxs = [];
  const recipients = [];
  const amountIns = [];
  const maxOuts = [];
  for (let buyerAddr of buyers) {
    recipients.push(buyerAddr);
    amountIns.push(utils.ether(amountToBuy));
    maxOuts.push(utils.hex(BigInt(tSupply) * BigInt(maxTx * 10 ** 4) / BigInt(100 * 10 **4)));
  }

  const tx = await aggregator.populateTransaction.multicall(
    wethAddr,
    token.address,
    recipients,
    amountIns,
    maxOuts,
    factoryAddr,
    true,
    false,
    utils.ether(amountToPayMiner),
    {
      value: utils.ether(amountToBuy * buyers.length)
    }
  );

  tx.gasPrice = gasPrice;
  tx.gasLimit = gasLimitForBuy * buyers.length;
  tx.chainId = provider._network.chainId;
  buyTxs.push({
    signer: signer,
    transaction: tx
  });

  const blockNumber = await provider.getBlockNumber()
  const minTimestamp = (await provider.getBlock(blockNumber)).timestamp
  const maxTimestamp = minTimestamp + timeLimit
  console.log('Target block number', blockNumber + targetBlock);
  const bundledTransactions = [
    ...buyTxs
  ];
  
  const signedBundle = await flashbotsProvider.signBundle(bundledTransactions);  

  const bundleReceipt = await flashbotsProvider.sendRawBundle(
    signedBundle,
    blockNumber + targetBlock,
    {
      minTimestamp,
      maxTimestamp
    }
  )
  
  const result = await bundleReceipt.wait();
  const receipts = await bundleReceipt.receipts();

  console.log('Bundle Receipt', bundleReceipt);
  console.log('simulation', await bundleReceipt.simulate());
  console.log('Result', result)
  console.log('Receipts', receipts);
  
  if (receipts && receipts.length > 0) { console.log('Private Buy succeeded') } else { console.log('Buy failed. See if the tx has reverts in console. Otherwise try running again'); }
}

main();

https://twitter.com/onlyone_degen/status/1674968904148606976