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SMS Notify! API

The SMS Notify! API is an SMS gateway for sending and receiving text messages from your website or application.

Create a client in any programming language to interact with the API. Check out our Quick Start Guides to get started with some of the most common platforms. If you have questions, browse our FAQ or contact us.

Numbers

To send a text message, you will need at least one sending number assigned to your account. SMS Notify! supports long codes, short codes, toll-free numbers, and international numbers. If you already have an account, you can manage your numbers here.

SMS Notify! automatically corrects for certain phone number errors.

Send and Receive Messages

SMS Notify! supports both SMS messages and MMS messages. You can both send MT (Mobile Terminated) text messages and receive MO (Mobile Originated) text messages.

Here is how sending a message works:

  1. Your server or application makes a request to the API.
  2. The API sends a response back to you with the status of your request.
  3. The API sends your message to the appropriate aggregator.
  4. The aggregator delivers the message to the appropriate carrier.
  5. The carrier acknowledges receipt of the message (short codes only).
  6. The carrier delivers the message to the recipient's cell phone.

Keywords

The SMS Notify! API will automatically respond to select keywords when it receives incoming text messages.

When using a short code, you may also assign custom keywords.

Postbacks

Use postbacks to get notified when your outbound message has been sent or when you have received an inbound message. The SMS Notify! API will automatically post information to a URL you specify each time a text message has been sent or received.

IP Ranges

To use the API, make sure to allow communication with the following IP address ranges:

  • 204.193.131.1 – 204.193.131.126
  • 174.140.140.65 – 174.140.140.126