flashbots sample

flashbots_goerli.js

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

// Standard json rpc provider directly from ethers.js. For example you can use Infura, Alchemy, or your own node.
// This sample uses one of the default provider goerli
const provider = new ethers.getDefaultProvider("goerli");

// `authSigner` is an Ethereum private key that does NOT store funds and is NOT your bot's primary key.
// This is an identifying key for signing payloads to establish reputation and whitelisting
const authSigner = new ethers.Wallet(
  '0x2000000000000000000000000000000000000000000000000000000000000000',
  provider
);

const init = async () => {
  // Flashbots provider requires passing in a standard provider and an auth signer
  const flashbotsProvider = await FlashbotsBundleProvider.create(
    provider,
    authSigner,
    "https://relay-goerli.flashbots.net",
    "goerli"
  );

  // sign a transaction with the defined authSigner
  const signedTransactions = await flashbotsProvider.signBundle([
      {
        signer: authSigner,
        transaction: {
          to: "0xf1a54b075fb71768ac31b33fd7c61ad8f9f7dd18",
          gasPrice: 10,
          gasLimit: 33000,
          chainId: 5,
          value: 0,
        },
      },
    ]);

  const blockNumber = await provider.getBlockNumber();

  console.log(new Date());
  const simulation = await flashbotsProvider.simulate(
    signedTransactions,
    blockNumber + 1
  );
  console.log(new Date());

  // Using TypeScript discrimination
  if ("error" in simulation) {
    console.log(`Simulation Error: ${simulation.error.message}`);
  } else {
    console.log(
      `Simulation Success: ${blockNumber} ${JSON.stringify(
        simulation,
        null,
        2
      )}`
    );
  }
  console.log(signedTransactions);

  // submit bundles for the next 10 blocks in this loop
  // Flashbots runs a small portion of the validators on Goerli
  for (var i = 1; i <= 10; i++) {
    const bundleSubmission = flashbotsProvider.sendRawBundle(
      signedTransactions,
      blockNumber + i
    );
    console.log("submitted for block # ", blockNumber + i);
  }
  console.log("bundles submitted");
}

init();