Congress & Legislation APIs

Q: Is there a free Congress & Legislation API?

Yes. Ayes and Noes, Brazilian Chamber of Deputies Open Data and UK Legislation Changes are free to use.

Q: Which Congress & Legislation APIs work without an API key?

Brazilian Chamber of Deputies Open Data, BCLaws and UK Legislation Changes need no key or sign-up, so you can try them with a plain request.

Q: Can I call a Congress & Legislation API from front-end JavaScript?

Brazilian Chamber of Deputies Open Data and UK Legislation Changes allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.

Q: Can I use Congress & Legislation APIs in a commercial project?

UK Legislation Changes permits commercial use.

Q: Which Congress & Legislation APIs work with AI agents?

UK Legislation Changes has an MCP server, so an AI agent can call it directly. Ayes and Noes and Brazilian Chamber of Deputies Open Data publish an OpenAPI spec for generating clients and tools.

Legislative APIs here are country-specific, so choose by jurisdiction. Ayes and Noes covers UK MPs and Commons voting records, and UK Legislation Changes tracks amendments sourced from legislation.gov.uk. Deutscher Bundestag DIP searches German proceedings and printed matter, Brazil's Chamber of Deputies publishes bills, votes and expense records free without a key, and BCLaws serves British Columbia statutes as XML.

5 listings

Table Rows

API	Pricing	Auth	Format	Free tier	Status
Ayes and NoesUK MPs, parties, Commons voting records and Early Day Motions, built on official Parliament data. Data & Knowledge › Open Government Data	Free	API key	JSON	<100/day	Live
BCLawsFull text and structure of British Columbia's statutes, regulations and municipal bylaws as XML. Data & Knowledge › Open Government Data		None	XML	Unlimited	Live
Brazilian Chamber of Deputies Open DataBrazilian federal deputies, bills, votes, committees, sessions, and parliamentary expense records. Data & Knowledge › Open Government Data	Free	None	JSON	Unlimited	Live
Deutscher Bundestag DIPSearch API for German Bundestag legislative proceedings, motions, printed matter and speakers. Data & Knowledge › Open Government Data		API key	JSON	—	Untested
UK Legislation ChangesTracks amendment history of UK legislation provisions, sourced from legislation.gov.uk. Data & Knowledge › Open Government Data	Free	None	JSON	Unlimited	Live

Choosing a Congress & Legislation API

Is there a free Congress & Legislation API?

Yes. Ayes and Noes, Brazilian Chamber of Deputies Open Data and UK Legislation Changes are free to use.

Which Congress & Legislation APIs work without an API key?

Brazilian Chamber of Deputies Open Data, BCLaws and UK Legislation Changes need no key or sign-up, so you can try them with a plain request.

Can I call a Congress & Legislation API from front-end JavaScript?

Brazilian Chamber of Deputies Open Data and UK Legislation Changes allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.

Can I use Congress & Legislation APIs in a commercial project?

UK Legislation Changes permits commercial use.

Which Congress & Legislation APIs work with AI agents?

UK Legislation Changes has an MCP server, so an AI agent can call it directly. Ayes and Noes and Brazilian Chamber of Deputies Open Data publish an OpenAPI spec for generating clients and tools.

Broader: Open Government Data APIs · Data & Knowledge APIs

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