Alchemy Documentation - Build anything onchain

Build anything onchain

Node

Build and scale your app on the most powerful web3 development platform.

Data

Access complete blockchain data through one unified API that grows with you.

Wallets

Onboard users with secure, easy-to-use, wallets. No seed phrase or gas required.

Rollups

Launch a custom rollup with native developer tools and scale to millions.

Query the blockchain instantly

Request

curl -X POST https://eth-mainnet.g.alchemy.com/v2/{apiKey} \     -H "Content-Type: application/json" \     -d '{  "jsonrpc": "2.0",  "method": "eth_getBlockByNumber",  "params": [    "0x68b3",    false  ],  "id": 1}'

Quickstart

Guides for 500+ endpoints on 80+ networks

Get started

Build anything onchain

Blockchain basics

Get started by learning how to connect your app to Ethereum using Alchemy’s JSON-RPC API.

Get started

Onboard people seamlessly

Create a Next.js app with embedded smart wallets, social login, and gas-less transactions in minutes.

Start tutorial

Real-time notifications via webhooks

Receive fast and reliable HTTP POST requests for onchain events across 80+ chains. No polling required.

View quickstart

Authentication made easy

Add authentication and embedded smart wallets to your existing React project.

Start tutorial

Onchain events subscriptions

Learn to subscribe to pending transactions, log events, new blocks and more using WebSockets across chains.

View quickstart

Upgrade to EIP-7702

Enable existing EOAs to benefit from batching actions, sponsoring transactions, and more.

Learn more