How come devRant doesn't have an easy way to find out how their API works? I'm reading off of wrappers to figure out what responses may contain and what the endpoints even are arghh

Reverse Engeniering is fun ;)
There isn't an official API and there where a few BC breaking changes, if I remember it right.
I'd look at the DevRant on Electron project if you want all api endpoints/responses that are implemented in a wrapper.
Otherwise throw on wireshark or something similar, make a wifi hotspot on your laptop and connect with your phone to it. Then use the app (or the function you're interested in) to see what requests are made and what response given.

It would be nice to have a swagger