Using the GroupList.io API

The GroupList.io API lets you automate email-related tasks such as subscribing users, sending campaigns, checking stats, and managing lists. It’s REST-based and easy to integrate with your site or app.

To use the API, you’ll need an API key. You can find your key in your account dashboard under Settings > API Access. Include it as a POST field in your requests like so:

api_key=YOUR_API_KEY

• /subscribe — Add a subscriber to a list
• /unsubscribe — Remove a subscriber
• /create-campaign — Send a new campaign
• /campaigns — Retrieve past campaigns and stats
• /lists — View and manage subscriber lists

All endpoints return JSON responses.

• Use HTTPS for all API calls.
• Validate all emails before adding them to lists.
• Throttle requests to avoid rate limiting.
• Store API responses for debugging.