Google Geocoding API, free? [closed]

Question

I found the the Google Geocoding API service which is very useful.
but in all sample appears necessary to put an argument called Key for provide the google Api Key. That implies that it involves costs, but I saw that it works well without this argoment. example:

https://maps.googleapis.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA

You can count on? they have any limitations?

Answer 1

Usage Limits

The Google Geocoding API has the following limits in place:

Users of the free API:

• 2,500 requests per 24 hour period.
• 5 requests per second.

Google Maps API for Work customers:

• 100,000 requests per 24 hour period.
• 10 requests per second.