Hello and welcome to Buttondown's API schema!
Buttondown's API has been designed to be as RESTful and uninteresting as possible: if there's a primitive in Buttondown, you should have a nice interface for it, with the ability to retrieve, create, modify, and delete. This means that with a few lines in your language of choice, you're able to programmatically keep track of your subscribers, send out new emails, and more.
If you're looking for where to find your API Key, check your API requests page.
Keeping our API reference accurate, up-to-date and easy to understand is really important to us. Whenever Buttondown's API changes, those changes will be posted here on our changelog.