SDKs & APIs - Base Documentation

Two surfaces cover everything you build on Base: a client SDK for accounts, sign-in, and payments, and the chain API for reading and writing onchain. Pick the one that matches what you’re calling.

Base Account SDK

Universal sign-in and one-tap USDC payments. pay, signInWithBase, spend permissions, and the full TypeScript reference.

Base Chain API

JSON-RPC, Flashblocks streaming, and Debug tracing against Base nodes.

Install

npm install @base-org/account

pnpm add @base-org/account

yarn add @base-org/account

Which surface do I need?

You want to…	Use
Sign a user in or accept a USDC payment	Base Account SDK
Read balances, blocks, logs, or send raw transactions	Ethereum JSON-RPC
Stream sub-second confirmations	Flashblocks API
Trace a transaction or block	Debug API

Build a use case instead

If you’d rather start from an outcome — issue stablecoins, facilitate payments, run private transactions — start with Build on Base.