I am working on a chrome extension that I would like to offer to around 500 people for free using the Google People API. Does anyone know the usage costs for the Google People API? I am trying to figure out if this free model approach is feasible.
There is no cost in regard the use of the API's only if you require more quota than the current limits (previous acceptance and agreement) and these may or may not be documented, but still can be found in your GCP project
API increase and possible charges
API & Services > QUotas and limits
The quota will be consumed per user per request and depends on the method
https://developers.google.com/people/v1/contacts
after the user exahust the quota or if a timeframe perlimit is breached the API will show 429/500 errors, exponential back off algorithm will help you prevent the time errors
if a per day quota is consumed the user will need to wait 24 hours to use the API again
I hope you find this information useful