verycouch is offering two types of usenet related stuff:

1. usenet access (same as a usenet provider like UsenetExpress)
2. usenet indexer (same as dog, slug, geek)

You got your post probably removed on Reddit due the fact, that verycouchs usenet access is a backdoor one. That means, that verycouch is neither a usenet provider (like Newshosting) nor a usenet reseller (like Frugal). They basically just subscribe to other usenet providers (or resellers) like we all do and resell that access to you. That violates both the usenet providers ToS and Reddits usenet sub rule.

Paying for an API is referring to the second part, being a (also) shady usenet indexer.