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Here are the operations that you can perform with Call Loop's API:

Add & Opt-Out Subscribers Using "Custom" Group Integration

Add Subscriber To a Group

When you create a Group, select the "Custom HTTP Post" integration and you will be given a URL. You can post the following variables to the URL, when adding a subscriber to this Group.

  • phone - REQUIRED
  • first - (optional)
  • last - (optional)
  • email - (optional)

Example URL:

Opt-out a Subscriber from a Group

In some cases, you may want to automatically opt-out a Contact from a Group. An example would be if you have two Groups, a subscriber Group and a customer Group. When someone buys a product, opt them out from the subscriber Group. 

To opt-out a subscriber from a Group, use the SAME group URL as above and replace the /r/ in the url, with an /s/ and trigger that by appending the phone variable to the URL.

Required variable to opt-out the subscriber:

  • phone - REQUIRED


Sending Text, Voice, and Ringless Voice Messages Using Triggers

Using our Triggers feature, you can send SMS text messages, Voice Broadcasts and/or Ringless Voice Mail (RVM) messages by pinging the URL given for a specific message.

To create a Trigger, first select your Group, then go to Messages > Triggers and create either your SMS text message, Voice Broadcast, or Ringless Voice Mail message. Once the Trigger is created, you'll be given a URL for THAT specific Trigger message.

You MUST first create the Trigger message, then copy the URL to send the post to.


To send this message, you can post the following variables to the URL.

  • phone - REQUIRED for SMS, Voice Broadcast & Ringless Voice Mail
  • first - (optional for SMS)
  • last - (optional for SMS)
  • email - (optional for SMS)

If you are personalizing the SMS text message, you may want to pass in the first name, last name, or email into the post.

Example URL:

Please contact Call Loop support, if you have any questions. 

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