What’s the API Key for in Google Maps API V3?

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Whilst it is true that V3 of the Google Maps API does not require an API key, it is there for a reason. Google recently introduced the following usage limits:

Web sites and applications using each of the Maps API may at no cost
generate:

  • up to 25,000 map loads per day for each API
  • up to 2,500 map loads per day that have been modified using the Styled Maps feature

In order to monitor usage an API key is necessary, as the developer notes make clear:

All Maps API applications should load the Maps API using an API key.
Using an API key enables you to monitor your application’s Maps API
usage, and ensures that Google can contact you about your application
if necessary. If your application’s Maps API usage by exceeds the
Usage Limits, you must load the Maps API using an API key in order to
purchase additional quota.

So whilst you don’t need to have an API key it is useful if you want to monitor your usage and also required if you buy additional usage quota.

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