title: Google Geocoding API, free?
body: <p>I found the the <a href="https://developers.google.com/maps/documentation/geocoding/" rel="nofollow">Google Geocoding API</a> service which is very useful.<br>
  but in all sample appears necessary to put an argument called <code>Key</code> for provide the google <code>Api Key</code>. That implies that it involves costs, but I saw that it works well without this argoment.
  example: </p>
  
  <pre><code>https://maps.googleapis.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA
  </code></pre>
  
  <p>You can count on? they have any limitations?</p>