Public Sector

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.

Documentation GitHub

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/openstates-api-plural-policy"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

name: OpenStates API (Plural Policy)
description: 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.
humanURL: https://openstates.org
baseURL: https://v3.openstates.org
tags:
- States
- Civic Tech
- Legislative
- Bills
- Plural Policy
tags_raw:
- State
- Civic Tech
- Legislative
- Bills
- Plural Policy
properties:
- type: Portal
  url: https://openstates.org
- type: Documentation
  url: https://docs.openstates.org/api-v3/
- type: GitHubOrganization
  url: https://github.com/openstates
- type: GitHubRepository
  url: https://github.com/openstates/openstates-scrapers