Can I generate a map image using the Google Static Maps API which I store and serve from my website? — You may not store and serve copies of images generated using the Google Static Maps API from your website.

What transaction limits apply to the Maps API? — From October 1st 2011 commercial web sites and applications using the Maps API may at no cost generate: up to 2,500 map transactions

Geocoding Usage Limits: Use of the Google Geocoding API is subject to a query limit of 2,500 geolocation requests per day