> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-use-case-ia-overhaul.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# SDKs & APIs

> SDKs and API references for building on Base — JSON-RPC, Flashblocks, and Debug APIs.

Everything you need to call Base programmatically, in one place.

## API reference

<CardGroup cols={2}>
  <Card title="API overview" icon="book" href="/base-chain/api-reference/rpc-overview">
    Endpoints, authentication, and error codes.
  </Card>

  <Card title="Ethereum JSON-RPC" icon="code" href="/base-chain/api-reference/ethereum-json-rpc-api/eth_blockNumber">
    The full standard JSON-RPC surface.
  </Card>

  <Card title="Flashblocks" icon="bolt" href="/base-chain/api-reference/flashblocks-api/flashblocks-api-overview">
    Sub-second confirmations and streaming.
  </Card>

  <Card title="Debug" icon="bug" href="/base-chain/api-reference/debug-api/debug_traceTransaction">
    Transaction and block tracing.
  </Card>
</CardGroup>