I was looking for some clarification on how this limit works and whether it would work well enough for a beta program of a new app. Is this 5000 per day per user of the app (i.e., eBay account), or 5000 per day per developer id (i.e., author of the apps account)? Or something else like 5000 per day per IP address or some such? Thanks,
I'm pretty sure the 5K/day is per developer/AppID. I think early on it was also per IP, but I seem to recall them removing that factor a few years ago. What I'm not sure about is if it's also per API family. You MIGHT be given 5K/day in each of the families -- Trading, Finding, Shopping, etc. -- but I'm not sure if that's true. There's no API call reporting outside of the Trading API, AFAIK, so I don't think we can really confirm it from the outside, aside from brute force testing.