> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-sync-code-change-91427ab.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 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.

<CardGroup cols={2}>
  <Card title="Base Chain API" icon="server" href="/base-chain/api-reference/rpc-overview">
    JSON-RPC, Flashblocks streaming, and Debug tracing against Base nodes.
  </Card>

  <Card title="Base Verify API" icon="user-check" href="/sdks/base-verify/overview">
    Prove verified account ownership and enforce Sybil-resistant eligibility policies.
  </Card>

  <Card title="base-anvil CLI" icon="terminal" href="/sdks/base-anvil">
    Build and test Base-native contracts locally with Base's Foundry toolchain.
  </Card>
</CardGroup>

## Which Surface Do I Need?

| You want to…                                           | Use                                                                                   |
| ------------------------------------------------------ | ------------------------------------------------------------------------------------- |
| Verify account ownership or enforce an identity policy | [Base Verify API](/sdks/base-verify/overview)                                         |
| Build and test Base-native contracts locally           | [base-anvil CLI](/sdks/base-anvil)                                                    |
| Read balances, blocks, logs, or send raw transactions  | [Ethereum JSON-RPC](/base-chain/api-reference/rpc-overview)                           |
| Stream sub-second confirmations                        | [Flashblocks API](/base-chain/api-reference/flashblocks-api/flashblocks-api-overview) |
| Trace a transaction or block                           | [Debug API](/base-chain/api-reference/debug-api/debug_traceTransaction)               |

<Card title="Looking for Base Account SDK or Base MCP?" icon="arrow-up-right-from-square" href="/sdks/migrated-products">
  These products and their documentation moved to Coinbase Developer Platform as Coinbase Wallet SDK and Wallet MCP.
</Card>

<Card title="Build a Use Case Instead" icon="rocket" href="/build-on-base/overview">
  If you'd rather start from an outcome — integrate DeFi, tokenize assets, issue stablecoins, or accept payments — start with Build on Base.
</Card>