The New York Public Library Digital Collections Ruby SDK by Tim Waters interacts with the API to access items, uuid, capture, and images methods. Examples demonstrate how to authenticate with API token.
New York City is hosting its third annual BigApps conference this year: BigApps 3.0. Build an application from any combination of 750 New York City data sets that describe everything from political campaign contributions to bicycle rack locations. There are more than a dozen different prize categories and $50,000 of cash prizes to be distributed. For the first time in a BigApps contest, New York City has its own API and the contest also encourages using APIs of NYC companies, including the Foursquare API and Etsy API.
How far back do your newspaper's online archives go? The U.S. Library of Congress has a database of thousands of newspapers dating back to the 1800s. In the case of over 150 of the papers, there are also digitized, searchable pages. And it's all available via its new Chronicling America API (technical details at our Chronicling America API profile).