More than half of these occurred in a community you moderate. Do you approve of this use of the term ‘spamming’ to silence criticism?
Exposing a free API for anyone to use is not typical trade practice for respectable fact-checking operations. You may be able to get free access as a non-profit organization, and that may be worth persuing. On the other hand, there’s a fundamental problem in the disconnect between the goals of real fact-checking websites and the kind of bot you are trying to create.