USASpending.gov
Search, display and download (SQL database, API) US federal expenditures. Follow the money from the Congressional appropriations to the federal agencies and down to local communities and businesses.
Federal Funding Accountability and Transparency Act of 2006 (FFATA) required that federal contract, grant, loan, and other financial assistance awards of more than $25,000 be displayed on a publicly accessible and searchable website ... In 2008, FFATA was amended by the Government Funding Transparency Act, which required prime recipients to report details on their first-tier sub-recipients for awards made as of October 1, 2010.