> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blockdb.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Service Limits

> Default rate limits and payload constraints; how to request increases.

### Defaults

* REST: concurrency and RPS are **plan-specific and account-wide**; they are **shared across all API keys** on the account (see [Rate limiting](/api-reference/overview/rate-limiting)). Responses include standard rate headers when applicable.
* Payload: request body and response size limits protect service stability.

<Note>
  Contact <a href="mailto:support@blockdb.io">support</a> for production increases. Provide expected RPS, concurrency, and dataset mix.
</Note>

### Best Practices

* Paginate queries using cursors
* Implement retries with backoff for 429/503 responses