Congress API

Access official, structured legislative data (bills, members, votes) directly from Congress.gov; the current version is v3.

This is the official Congress.gov Application Programming Interface (API), maintained by the Library of Congress, providing machine-readable data for public and congressional use. The current version, v3, delivers structured legislative information—including bills, amendments, members, and the Congressional Record—in both XML and JSON formats. Access requires a free API key from Data.gov, with a generous rate limit of 5,000 requests per hour, ensuring reliable access to critical U.S. legislative history and real-time updates.

https://api.congress.gov/