Just read @7c9e23f5 kvetching about the state of podcast analytics, at https://blog.lime.link/real-time-podcast-stats/

I guess he's not heard of @68a77ba3 's OP3 - a service that is free and has the API he's looking for (and more to come!). Here are many of the people using it: https://podcastbusinessjournal.com/data/podcast-downloads/