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Important changes to how the Google Calendar API manages and limits queries

What’s changing 

There has been a change to how the Google Calendar API manages usage. Previously, Calendar API queries were monitored and limited daily. These queries are now monitored and limited on a per-minute basis. 

See below for more information. 

Who’s impacted 

Admins and developers 

Why it’s important 

This change introduces better behavior when a quota is exceeded, as requests will be rate-limited until the quota is available rather than falling all requests for the rest of the day. Additionally, this will help developers identify issues around quota enforcements faster. 

More information regarding your usage and quota limits can be found in the Google API console

Additional details 

To ensure you’re working efficiently with your quota, we recommend: 
  • Using push notifications instead of polling. 
  • Randomized timing to ensure user requests are spread out evenly, rather than bursts of requests. 
  • Using incremental synchronization with sync tokens for all collections instead of repeatedly retrieving all the entries. 
  • Increasing page size to retrieve more data at once by using the max results parameter. 
  • Updating events when they change to avoid recreating all the events on every sync. 
  • Using exponential backoff for error retries to make rate-limiting work properly. 

Getting started 

  • Admins and Developers: Use this guide to learn more about how to view your API usage and limits.
  • End users: There is no end user impact for this feature. 


  • Available to all Google Workspace customers, as well as G Suite Basic and Business customers 


source http://workspaceupdates.googleblog.com/2021/06/google-calendar-api-update.html

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