> For the complete documentation index, see [llms.txt](https://ajaib.gitbook.io/ajaib-exchange-open-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ajaib.gitbook.io/ajaib-exchange-open-api/api-references/general-information/http-return-codes.md).

# HTTP Return Codes

* HTTP `4XX` return codes are used for malformed requests; the issue is on the sender's side.
* HTTP `403` return code is used when the WAF Limit (Web Application Firewall) has been violated.
* HTTP `429` return code is used when breaking a request rate limit.
* HTTP `5XX` return codes are used for internal errors; the issue is on our server side. It is important to **NOT** treat this as a failure operation; the execution status is **UNKNOWN** and could have been a success.