Looks simple and good to me. However, on first glance, it's missing some quickstart guide/introduction and how to authenticate. Also, some calls seems to return nothing at all, is that correct?
I've written a draft for a quick start guide using python/javascript (code with comments). I've been withholding publishing it because it's not fully done yet and message queues and the android app (only thing to do is the Matrial UI) are my #1 priority at the moment.
One of the main ideas behind the service is that there is no authentication. You just generate a persistent UUID and use that.