# SMS Rest API overview {% hint style="warning" %} This section contains technical documentation for the **Developer Central** and **Secure** products, relevant to all Clickatell accounts created **before 15 November 2016.** It also contains some **Platform** developer documentation referring to APIs that have since been updated or are no longer supported. Refer to the rest of this Dev Docs site for the latest API documentation. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.clickatell.com/developers-api-reference/developers-archive/sms-rest-api-overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.