Hi Jonathon-
You mentioned that you’re using /wc/v3 in the Never cache the following pages section, I’d like to verify that you’re using the correct regular expression:
/wc/v3/*
I’d also like to verify that you’ve input this into the “Never Cache” sections for both Page Cache and Database Cache.
Another possible way to fix this is to find out which user agent your API calls are using, and add that string to the Rejected User Agents field in your Page Cache settings.
If you’re still having trouble, are you able to provide the response JSON here so we can see if there’s any additional information contained there?