I don’t know if it will help, but I show an exerpt of the last topics on my Wordpress website.
https://monocycle.info/ Look at the right sidebar.
I use https://forum.monocycle.info/latest.json?order=created&ascending=false
But I need additional information, so I use I use https://forum.monocycle.info/site.json to get the categories’ names from their ID.
I also use https://forum.monocycle.info/t/[topic-number] for each of my 5 last topics to get additional information.
I don’t do much of these requests, I use a CRON task so it’s not updated in real time, maybe twice or once a day…
Maybe @JammyDodger’s link will be of better help 