Open States API v3

openstates.org

Provides a JSON API for programmatically accessing US state legislative information including bills, legislators, jurisdictions, committees, and events.

The Open States API v3 API uses api key authentication; has freemium pricing. Verified 2026-07-12 with per-field source links.

Data & Enrichment Verified 2026-07-12 medium confidence

Base URL

https://v3.openstates.org/

docs.openstates.org ↗

Auth

api_key

docs.openstates.org ↗

Free tier

not documented null

no source

Pricing model

freemium

pluralpolicy.com ↗

Pricing

Free open data and democracy tools available; API access managed through open.pluralpolicy.com with pricing tiers

pluralpolicy.com ↗

Rate limits

not documented null

no source

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source