The comparison between the location data APIs is difficult to keep up to date, with a fast past of space, and with acquisitions such as SimpleGeo and HyperPublic, it is rapidly changing the landscape.
So I just want to take a look at CityGrids from February 2012. CityGrid provides 18 million locations in the United States, allowing you to receive up to 10 million requests per month for developers (publishers) for free.
You can search a wide range of What and Where searches (Cities, neighborhoods, postal codes, metro areas, addresses, intersections), including latlong. We have rich data for each place, including images, videos, reviews, offers, etc.
CityGrid also has a developer’s revenue sharing program where we will pay you for displaying certain places, as well as large mobile and online advertising networks.
You can also request Places through the CityGrid API, using Factual, Foursquare and other places of the places providers and place identifiers. We combine data from several providers of location data in our system.
Website: http://developer.citygridmedia.com/
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