The current API for this website is going to be deprecated in the coming week or two. Luckily, there are not many people who use this. With luck, the transition will be painless.
The reason behind this is WordPress is building its own API (more info here), which uses its own integrated framework and system of doing things.
I discovered this today when I made an attempt to submit my API’s plugin to the WordPress public repository, and it was denied. Not due to any fault of mine, but the WordPress folks are doing their best to discourage competition and (more importantly) market fragmentation.
There is currently no problem with the existing system. Just a heads up that the endpoints and protocols may change sooner rather than later to a more long-term solution.
I would also like to announce that there may be a new member joining the UOLTT team! She will be helping me rebuild the API and keep the process running smooth. More info to come.
If any questions or concerns come up, please leave them in the comments!
The new API development is in progress. See its page for more information.