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Sending ETH in Batch with Axir Smart Account

Overview​

This guide covers how to send ETH to multiple recipients in a single transaction.

Prerequisites​

import { AxirCore } from "axr-erc4337-sdk";
import { ethers } from "ethers";
import { type Hex, type Address } from "viem";

Implementation​

1. Initialize AxirCore​

const axirCore = new AxirCore(
  process.env.PRIVATE_KEY as Hex,
  process.env.RPC_URL as string,
  process.env.BUNDLER_URL as string,
  BigInt(0), // nonce
  "baseSepolia" // network name
);

2. Prepare and Send Batch ETH Transfers​

// Prepare batch ETH transfer UserOperation
const batchUserOp = await axirCore.prepareUserOperation(
  [
    {
      contract: receiver1Address,
      value: ethers.parseEther("0.001"),
      abi: [], // Empty for ETH transfers
      functionName: "",
      args: [],
    },
    {
      contract: receiver2Address,
      value: ethers.parseEther("0.002"),
      abi: [],
      functionName: "",
      args: [],
    },
  ],
  undefined,
  usePaymaster,
  paymasterType
);

// Estimate gas costs
const gasEstimate = await axirCore.estimateUserOperationGas(
  batchUserOp,
  usePaymaster,
  paymasterType
);

// Log gas estimates
console.log("Gas Estimation for batch ETH transfer:");
if (gasEstimate.totalGasFeeInEth) {
  console.log(
    `Estimated gas fee in ETH: ${ethers.formatEther(
      gasEstimate.totalGasFeeInEth
    )} ETH`
  );
}
if (gasEstimate.totalGasFeeInToken) {
  console.log(
    `Estimated gas fee in tokens: ${ethers.formatUnits(
      gasEstimate.totalGasFeeInToken,
      gasEstimate.tokenDecimals
    )} ${gasEstimate.tokenSymbol}`
  );
}

// Execute the batch transaction
const txHash = await axirCore.executeUserOperation(batchUserOp);
console.log("Batch transaction hash:", txHash);