> For the complete documentation index, see [llms.txt](https://docs.layerlens.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.layerlens.ai/12.-support/api-troubleshooting.md).

# API troubleshooting

API-specific troubleshooting.

| Symptom | Likely cause              | Fix                                 |
| ------- | ------------------------- | ----------------------------------- |
| 401     | Missing/invalid API key   | Check `X-API-Key` header            |
| 403     | Wrong scope or wrong org  | Verify key scope; switch active org |
| 404     | Wrong ID or different org | Check ID; check active org          |
| 429     | Rate limited              | Honor `Retry-After`; back off       |
| 5xx     | Transient                 | Retry with exponential backoff      |

Always include `X-Request-ID` in support tickets.

## See also

* [API errors](https://github.com/LayerLens/gitbook-full/blob/main/13-reference/api/errors.md)