The following questions are about google API credentials (In my case - maps and calendars API's)
Thanks!
"The only source of knowledge is experience." -Albert Einstein
For calendar, here is the documentation to know the usage limits.
The Google Calendar API has a courtesy limit of 1,000,000 queries per day.
To view or change usage limits for your project, or to request an increase to your quota, open the API Library in the Developers Console.
If you have enabled billing for your project, you can see the quota percentage for each API. You can view and change quotas from the API section's API Library and Enabled APIs links. Selecting an API from the API Library list or from the Enabled APIs page takes you to a page with overview, usage, and quota links for that API. Choosing Quotas lets you view and change quota-related settings. Choosing Usage provides you with usage statistics as well as response code and method information.
And for maps, you can visit this documentation.
Standard Usage Limits
Users of the standard API:
- Free until exceeding 25,000 map loads per 24 hours
Note: Quota exceptions may apply. Learn more here.
Enable pay-as-you-go billing to unlock higher quotas:
After exceeding the free usage limits, billing at $0.50 USD / 1000 additional requests, up to 100,000 per 24 hours.