OP3

[LoudLemur]

https://op3.dev/

The Open Podcast Prefix Project (OP3) is a free and open-source podcast prefix analytics service committed to open data and listener privacy.
It's easy: no signup or login required

Podcasters or podcast hosting companies can prepend
https://op3.dev/e/
to podcast episode urls in their feed to participate and start measuring downloads.
(No need to remove existing prefixes, there can be more than one)