From their site: The API allows access to the data to the Federal contracts and Federal assistance databases. All data present on USAspending.gov is available through the API, except for pie charts and end-of-search totals. The site is a re-launch of www.federalspending.gov.
Ten APIs have been added to the ProgrammableWeb directory in categories including Satellites, Privacy, and Government. Highlights include an API that tracks federal spending, an API for generating cryptographic keys, and an API that predicts the weather and waters yards accordingly.
We recently added this new API listing to the US government site USAspending.govwhich provides API access to budget data, but we didn't notice a detail which one of our readers did: that there's this somewhat intimidating, red-text warning on the homepage.