GDPR, I'm hoping that I don't have to bother my users with a "do you consent to" popup when the only thing I want to do is to log server-side the API calls so that I can see patterns in usage and such. If I were to show such a "do you consent to" popup users might mistakenly think I'm one of those techcrunchers with hundreds of data partners that all get to see your PII. I do not want to affiliate myself with those type of actors.
"The principles of data protection should therefore not apply to anonymous information, namely information which does not relate to an identified or identifiable natural person or to personal data rendered anonymous in such a manner that the data subject is not or no longer identifiable. This Regulation does not therefore concern the processing of such anonymous information, including for statistical or research purposes."
As long as it's not linked to a particular profile ("pseudonymous" doesn't count, it could still be linked), it's fine.