Using SDK

Using the @account-kit/infra Library for UserOperation Management

The @account-kit/infra library enables direct interaction with Alchemy’s ERC-4337 bundler for advanced UserOperation management. The alchemyFeeEstimator function leverages underlying APIs, including rundler_maxPriorityFeePerGas and eth_estimateUserOperation, to estimate gas fees for UserOperations. Below are examples demonstrating how to estimate and send a UserOperation and how to retrieve a UserOperation by its hash using low-level Bundler APIs.

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import { alchemy, sepolia } from "@account-kit/infra";
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const YOUR_API_KEY = "<YOUR_API_KEY>";
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export const YOUR_PRIVATE_KEY = "<YOUR_PRIVATE_KEY>";
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export const chain = sepolia;
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export const transport = alchemy({
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  apiKey: YOUR_API_KEY,
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});