Missing Object in APIv1 Object list or User going blind!

"Topics", maybe?

https://devdocportal.lithium.com/t5/Community-API-v1-Reference/bd-p/restv1docs?section=commv1&leaf-id=Node.topics#Node.topics.count

Hi allensmith81 

Tyson is correct, it is 'topics' (plural). That said, you should be able to find links to the objects that support /topics/count after typing a few letters into the endpoint Search box.