General Services Administration
GSA Auctions API is a public GET API. The Auction listings will be delivered to the user in two formats. One is JSON and the other one is XML. The auction listings delivered thru the API contains the auction listings from all the participating agencies.
Data.gov's own API can be accessed using the Data.gov CKAN API.
FBOpen is an API to a search index containing opportunities to do business with the U.S. Federal Government.
summary: The System for Award Management manages all the registrations of entities wishing to do business with the federal government. The SAM API provides easy access to public information about those entities.
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