Mailchimp has shut down API 1.1, 1.2, and 1.3 as of April 2, 2019.
Mailchimp API 3.0
We’ve rebuilt Mailchimp's API from the ground up to be simpler, more consistent, and truly RESTful. With version 3.0, it’s easier than ever to sync email activity with your database, link campaign stats to your database, and test different calls and endpoints before pushing to production.Let's Do This!
Start by learning the basics of the Mailchimp API, and view available resources in our complete API Reference.Learn More
Explore the Mailchimp API with your own data in our interactive Playground.Get Started
Learn more about Mandrill, our powerful delivery API, for sending one-to-one e-commerce messages and automated transactional emails.View Mandrill Docs