FantasyData.com, NFL statistical data provider, offers the FantasyData NFL API. The API gives developers access to NFL data (e.g. team stats, live scores, season information, box scores, and more). The API targets web and mobile app owners who develop apps for the fantasy football market. Many of the most popular fantasy football apps have already integrated with FantasyData's APIs.
ScoreStream, a high school sports app and platform, recently announced the launch of a public ScoreStream Local Sports API. The API offers access to data, including schedules and scores, for 10,000 to 15,000 high school games every week while schools are in session, as well as other sporting data.