Skip to main content
Choose the SDK or API surface that matches what your application needs to call. Base provides account and payment SDKs, identity verification APIs, transaction attribution guides, an MCP server for AI assistants, and direct chain APIs.

Base Account SDK

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

Base MCP

Connect any AI assistant to a Base Account. Check balances, send funds, swap tokens, sign messages, and pay with x402.

Base Chain API

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

Builder Codes

Attribute onchain transactions to your app, wallet, or agent with ERC-8021.

Base Verify API

Prove verified account ownership and enforce Sybil-resistant eligibility policies.

​
Install

​
Which Surface Do I Need?

Build a Use Case Instead

If you’d rather start from an outcome — integrate DeFi, tokenize assets, issue stablecoins, or accept payments — start with Build on Base.