> ## 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

> Choose the Base SDK, API, or CLI that matches what you are building.

Use these references when you know which interface your application needs. Start with the SDKs & APIs overview to compare Base-maintained surfaces, or jump directly to local development and chain RPC methods.

## Choose an Integration Surface

<CardGroup cols={2}>
  <Card title="SDKs & APIs Overview" icon="book" href="/sdks/overview">
    Compare the Base Chain API, identity verification, and command-line tooling.
  </Card>

  <Card title="Migrated Documentation" icon="arrow-up-right-from-square" href="/sdks/migrated-products">
    Find wallet SDK and Wallet MCP documentation on Coinbase Developer Platform.
  </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>

## Call the Chain

<CardGroup cols={2}>
  <Card title="Base RPC Overview" icon="network-wired" href="/base-chain/api-reference/rpc-overview">
    Choose between standard block data and 200 ms Flashblock preconfirmations.
  </Card>

  <Card title="Ethereum JSON-RPC" icon="code" href="/base-chain/api-reference/ethereum-json-rpc-api/eth_blockNumber">
    Read chain state, estimate gas, send transactions, query logs, and subscribe to events.
  </Card>

  <Card title="Flashblocks API" icon="bolt" href="/base-chain/api-reference/flashblocks-api/flashblocks-api-overview">
    Use preconfirmation-aware methods and streams for sub-second application feedback.
  </Card>

  <Card title="Debug API" icon="bug" href="/base-chain/api-reference/debug-api/debug_traceTransaction">
    Trace transactions and replay blocks when debugging contract execution.
  </Card>

  <Card title="Base Services Hub" icon="grid-2" href="/get-started/base-services-hub">
    Find RPC, data, security, and other service providers that support Base builders.
  </Card>
</CardGroup>