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

# Rate limits

> Concurrency and throughput limits per plan, plus how to handle them.

ScrapeUnblocker rate-limits per-account, not per-IP. Your plan determines:

* **Concurrent requests** - how many in-flight requests we'll accept at once.
* **Monthly request quota** - total calls per billing period.

Free trial accounts start with a small concurrency limit. Paid plans scale up. Exact numbers for each tier are on the [pricing page](https://scrapeunblocker.com/pricing).

## When you hit the limit

If you exceed your concurrency cap, additional requests queue briefly on our side rather than failing immediately. If queuing would exceed a reasonable wait, you'll get a `429 Too Many Requests` response.

The recommended client behavior:

1. Run a fixed worker pool sized to your concurrency limit.
2. On `429`, back off for the duration in the `Retry-After` header (if present), otherwise 5 seconds.
3. Resume.

```python theme={null}
import time
import requests

def call(url, key):
    while True:
        r = requests.post(
            "https://api.scrapeunblocker.com/getPageSource",
            params={"url": url},
            headers={"x-scrapeunblocker-key": key},
            timeout=120,
        )
        if r.status_code == 429:
            wait = int(r.headers.get("Retry-After", "5"))
            time.sleep(wait)
            continue
        return r
```

## Monthly quota

When you've used your monthly quota, requests return `402 Payment Required`. Upgrade your plan or wait for the next billing cycle. You can monitor remaining quota in the [dashboard](https://app.scrapeunblocker.com).

## Need more throughput?

Contact us via the [help center](https://scrapeunblocker.com/contact) - we offer custom limits for high-volume customers.