> For the complete documentation index, see [llms.txt](https://guides.tability.io/api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.tability.io/api/tability-api/errors.md).

# Errors

Tability uses conventional HTTP response codes to indicate the success or failure of an API request.

As a general rule:

* Codes in **2xx** range indicate success
* Codes in **4xx** range indicate failures due to missing information, or incorrect state (could be a missing parameters, wrong subscription, forbidden access...)
* Codes in the **5xx** range indicate an error with Tability's server (please contact support if this happens)