api whereabouts

Is there a document someplace of the exposed api functions in vers. 2.1? I've seen the Help/Documentation/Managing API Settings, and also downloaded the javascript client example but that seems to show just one api function: apiBaseUrl.
I'm wondering what are the other api functions in this new feature for vers 2.1?

The developer reference for the REST API lives on Read the Docs, with the rest of the developer documentation.

The API has its own section of that documentation.