SDKs & APIs

SDKs, APIs, and command-line tools for identity verification, local development, and direct Base chain access.

Choose the SDK, API, or command-line tool that matches what your application needs. Base provides identity verification APIs, local development tooling, and direct chain APIs.

Base Chain API

JSON-RPC, WebSocket subscriptions, and Debug tracing against Base nodes.

Base Earn API

Earn and borrow on Base from any wallet with unsigned, ready-to-sign transactions.

Base Verify API

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

Foundry for Base

Build and test Base-native contracts locally with Foundry v1.8.4 or later.

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Which Surface Do I Need?

You want to…	Use
Let users earn yield or borrow from their own wallet	Base Earn API
Verify account ownership or enforce an identity policy	Base Verify API
Build and test Base-native contracts locally	Foundry for Base
Read balances, blocks, logs, or send raw transactions	Ethereum JSON-RPC
Stream new blocks and logs	eth_subscribe
Migrate a Flashblocks integration	Migrate From Flashblocks
Trace a transaction or block	Debug API

Migrated and Deprecated Products

Find where OnchainKit, MiniKit and mini apps, the Base Account SDK, Base MCP, and other retired, moved, or renamed products went.

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.