This apis can be called with request of coordinates ie latitude and longitudes and the item you are looking,
https://api.foursquare.com/v2/venues/search ?client_id=CLIENT_ID &client_secret=CLIENT_SECRET &v=20130815 &ll=40.7,-74 &query=pizza
This api would return all the near by please / restaurants which can be consumed and drawn on google maps for easy navigation. They have a database with 65 million points.
API Documentation link : https://developer.foursquare.com/docs/
Before you get started, you should create an app on Foursquare. This will give you a client ID and client secret which are needed for using the API. The documentation in this guide is meant to give a high-level conceptual overview of the Foursquare platform, help you grok its different parts and capabilities, and get started using the API’s most popular features. See our detailed documentation for a more in-depth reference.
There is also an UI or App exposed by four square.