Understanding Quotas for Google API

Question

I'm currently integrate Google+ API to my service. I'd like to know what's the limitation for this kind of api: https://www.googleapis.com/plus/v1/people/{user_id}/activities/public

in google develop console, I found this: Quota summary

Free quota  10,000 requests/day
Remaining   9,998 requests/day
            99.98% of total
Per-user limit  
5 requests/second/user

I think there will be two kind of limitation:

1. Application level

   For example, how many requests can an app send per day(sum of the number for all users), and what's the max qps?

2. User level

   For example, how many requests can an app send per day for a special user, and what's the max qps?

But I can't find the exactly info, does anyone know?

Answer 1

Can't say particularly about this API, but when I used Google Places api the quota was linked with IP address.
So if it expired, we need to use different IP for hit.
No user / application quota.

Answer 2

you already have those answers in your question:

10,000 requests per day in total, using that developer console key, thus your total "app" calls.

per user there is no limit, there is a rate quota. a single user could at most make 5*(seconds in a day) requests per day.

in this specific api case this is much bigger than 10,000 thus that rate quota is not that useful (except it prevents users from quickly depeting the 10,000 daily quota).

you can edit that rate quota so its lower or higher, and is used so a single user cant consume all the app quota (maliciously or otherwise)