Discussion of Google's recent acquisition of Jambool has largely centered around its virtual currency platform, Social Gold. The power behind that platform comes in the form of the Social Gold API. Again, Google has bought a company whose API is central to its success.
BlockAvenue, location-based analytics company, has announced the release of its first BlockAvenue API. The API gives developers access to BlockAvenue's data (e.g. BlockScores, block reviews, neighborhood reviews, counts, etc.). BlockAvenue provides geolocation data on most neighborhoods across the US, often down to the block level. Its database grows everyday and BlockAvenue expects the API to push BlockAvenue towards its ultimate goal.