SeatGeek is a ticket search site that aggregates sports, concert, and theater ticket listings from over 60 ticketing sites -- including StubHub and TicketsNow. The SeatGeek API provides developers with broad access to the company’s dataset of nearly 100,000 live events. The RESTful API returns requests in JSON, JSONP, and XML and can provide detailed information on venue lat/lon, average ticket price, seating location, and more. SeatGeek has a community portal that keeps a record of all support conversations and is a useful tool when looking to get questions answered. Sites can also monetize their content with SeatGeek's API by registering in SeatGeek's Partner Program. Each time a partner sends a referral to SeatGeek and they purchase a ticket, SeatGeek will pay their partner 50% of the revenue earned on that transaction. Currently users are averaging $11 per sale generated.
Tagdef.com is the worlds largest hashtag dictionary. Use this api to access these definitions. The content is user-generated, and the directory currently contains over 60.000 definitions. The hashtags can have many definitions each, ordered by user-votes. The hashtags are often related to Twitter , but is also commonly used on Pinterest and Google+ . This API is free to use, but you must provide a clickable link back to the tagdef.com page for the given tag when using information from the API. This link can be found in the uri part of the reply.
An API for interesting facts about numbers. Provides trivia, math, date, and year facts about numbers. For example, "5 is the number of platonic solids", "42 is the number of little squares forming the left side trail of Microsoft's Windows 98 logo", "February 27th is the day in 1964 that the government of Italy asks for help to keep the Leaning Tower of Pisa from toppling over"