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Look up one US federal bill by id: title, sponsor, cosponsors, committees, policy area, full action history and computed lifecycle stages (introduced to enacted). Source: Congress.gov + GovInfo, public-domain.
Search US federal bills by keyword (optionally within one Congress) and get a ranked list of matching bills with id, title and latest action. Source: Congress.gov, public-domain.
Stateless event diff for a US federal bill: which lifecycle stages it reached over a date window (introduced, committee, passed, enacted), each with date and source action. Source: Congress.gov, public-domain.