Using a third-party paymaster

The SmartAccountClient within @alchemy/aa-core is unopinionated about which paymaster you use, so you can connect to any paymaster really simply. Configuration is done using the paymasterAndData config option when you call createSmartAccountClient.

Usage

import { createSmartAccountClient } from "@alchemy/aa-core";
import { sepolia } from "viem";

const chain = sepolia;
const client = createSmartAccountClient({
  chain,
  transport: http("RPC_URL"),
  paymasterAndData: {
    // sets the dummy paymasterAndData with paymaster address appended with some dummy paymasterData
    // that looks like a valid paymasterData
    dummyPaymasterAndData: () =>
      `<PAYMASTER_ADDRESS><PAYMASTER_DUMMY_DATA>` as Hex,
    paymasterAndData: async (userop, opts) => {
      // call your paymaster here to sponsor the userop
      // leverage the `opts` field to apply any overrides
      return {
        ...userop,
        paymasterAndData: "0xresponsefromprovider",
      };
    },
  },
});