# SMS Gateway Docs {% hint style="warning" %} We don't create new accounts for the SMS Gateway platform, except in very specific circumstances. The de facto API to use is the [One API](broken://pages/WO0QcQy7yggUTFlBbLE8). Please reach out to our [Support Team](https://www.clickatell.com/contact-support/) with any questions. {% endhint %} Access the latest technical and business guides for our hosted specialized [SMS Gateway](https://www.clickatell.com/products/sms-gateway/) product and services below. These also cover API documentation for our Developer Central platform, applicable to customers who created an account with Clickatell **before 15 Nov 2016.** * [Clickatell Sender ID User Guide](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/Clickatell%20Sender%20ID%20User%20Guide%20V1.3.pdf) * [Clickatell Two-Way Technical Guide](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/Clickatell%20two-way%20technical%20guide%20v1.9.pdf) * [FTP API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/FTP%20API%20Specification%20V2.7.pdf) * [HTTP API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/HTTP%20API%20Specification%20V2.6.pdf) * [SMPP API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/SMPP%20API%20Specification%20V2.6.pdf) * [SMS REST API](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/SMS%20REST%20API%20v2.0-1.pdf) * [SMTP API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/SMTP%20API%20Specification%20V2.5.pdf) * [SOAP API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/SOAP%20API%20Specification%20V1.3.pdf) * [XML API Specification](https://6194477.fs1.hubspotusercontent-na1.net/hubfs/6194477/XML%20API%20Specification%20V2.6-1.pdf) --- # 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-documentation/sms-gateway-docs.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.