OpenStates API (Plural Policy)
OpenStates v3 REST API at v3.openstates.org, operated by Plural Policy, providing JSON access to U.S. state legislative information — bills, people (legislators and governors), jurisdictions, committees, and events across all 50 states, D.C., and territories. Authentication via X-API-KEY header or apikey query parameter. The legacy v2 GraphQL endpoint is deprecated.