With huge budgets spent on marketing, it's probably a good idea to keep track of which marketing avenues are working and which aren't. Call Tracking Metrics is a simple telephone call tracking service that aims at helping users link incoming calls to specific marketing campaigns and in so doing, easily track and analyze the amount of calls received due to that particular campaign. The Call Tracking Metrics API provides access to this functionality.
After continued requests for access to more Yelp data, and additional API functionality, Yelp has launched a developer preview of a brand new API. The Yelp API was rebuilt from the ground up. Yelp envisions the new features, data, and architecture will simplify the developer experience.