Congress.gov API
The api.congress.gov REST API, maintained by the Library of Congress, exposes structured legislative data — bills, amendments, summaries, members, committees, committee reports, congressional record, nominations, treaties, and congresses. Auth via api.data.gov key. The canonical programmatic feed for the U.S. House and Senate replacing the legacy congress.gov RSS / XML downloads.
Documentation
Documentation
https://github.com/LibraryOfCongress/api.congress.gov/
Authentication
https://api.data.gov/signup/