> This page is for version 2025-08-08.
> For other versions, use one of these documentation indexes:
> - 2025-11-27 (default): https://docs.caesar.xyz/2025-11-27/llms.txt
> - 2025-08-08: https://docs.caesar.xyz/2025-08-08/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.caesar.xyz/llms.txt.
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# Rate Limits

> **Info**
>
> If you require higher limits, please contact us at [support@caesar.xyz](mailto:support@caesar.xyz).

> **Note**
>
> **Scope:** These limits apply **only** to `POST /research` (create research). Other endpoints are not rate-limited under this policy.

The Caesar API has the following limits:

* **Concurrent research jobs:** 5 per account (in-progress jobs, including `queued`).
* **Monthly compute budget:** 200 compute units, counted only for **successful** research jobs.

## Exceeding limits

When a limit is exceeded the API returns **429 Too Many Requests**:

```json
{ "error": "Too many requests - rate limit exceeded." }
```

**Recommended client behaviour**

* Retry with exponential back-off.
* Serialise new jobs when you're at the concurrency cap.
* Use `compute_units` thoughtfully to stay within your monthly budget.

#### What is a compute unit?

A compute unit represents the effort allocated to a research job. Your monthly usage is the sum of the `compute_units` for jobs that reach the `completed` status.

#### What counts as 'concurrent'?

Any job that is not yet `completed` or `failed` (e.g. `queued`, `searching`, `summarising`, `analysing`) counts towards your concurrency limit.

#### When do monthly limits reset?

Limits reset on a monthly cadence; your dashboard shows your remaining balance and the next reset window.

#### Can I request higher limits?

Yes. Email [[support@caesar.xyz](mailto:support@caesar.xyz)](mailto:support@caesar.xyz) with your expected volumes and use case.

#### Where can I see my remaining quota?

Visit your [dashboard](https://www.caesar.xyz/api-keys) after signing in.