 <p>You are referencing to the wrong API. The link you have provided is for the Google Play Developer API which is for subscription, in-app purchase and publishing. The API for sharing progress and other in-game API calls is the <a href="https://developers.google.com/games/services/" rel="nofollow">Google Play Games Services</a> which has a default quota of 50000000 requests/day and in which the user can have 500 requests per second(The quotas can be seen in the Developer's Console). You could also see <a href="https://developers.google.com/games/services/quota" rel="nofollow">Managing Quota and Rate Limiting</a> for other info about the quota and limits.</p>