Free Google Maps API

You can create a list of geofence objects by setting the latitude, longitude, radius, duration, and transition types of each geofence . The transition types indicate the events that trigger the geofence, such as when users enter or exit a geofence.

In 2021 there are no free Google Geocoding requests at all any more , see developers.google.com/maps/documentation/geocoding/…

Google limits free geocoding to 40,000 per month and you must have a credit card on file to use their free tier. Extra lookups above that point are $4/1,000.