> For the complete documentation index, see [llms.txt](https://help.hummingbird.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.hummingbird.co/hummingbird-api/is-there-a-limit-on-the-size-of-api-calls.md).

# Is there a limit on the size of API calls?

To ensure the safe and reliable operation of the Hummingbird platform, we enforce limits on the size of API payloads.<br>

* **Standard API Payloads:**

  The API supports payloads up to 2 MB in size. This limit is designed to accommodate thousands of individual transactions efficiently.
* **Alert Uploads API:**

  This API is specifically designed to support larger datasets up to 10 MB in size and more detailed Alert requests.

{% hint style="info" %}
**A note on FINCEN** - FinCEN imposes a size limit of 1 MB for transaction CSV attachments. Hummingbird will handle anything above that limit on-platform.
{% endhint %}

If you have any questions or concerns, please reach out to the Hummingbird team (<support@hummingbird.co>).


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