Vaquill AI
Legal data API covering U.S. federal and state primary law
About Vaquill AI
Vaquill AI provides software with original U.S. primary-law data covering the U.S. Code, Code of Federal Regulations, Federal Register agency rules, state codes from all 52 U.S. jurisdictions, state and federal constitutions, federal procedural rules, and executive orders, proclamations, and presidential memoranda since 2015. The platform places more than 4.9 million provisions in a unified structure and provides citations and links to official sources; the asOf parameter lets you query provision content for a past date and its source notes.
Best for
Best use cases
Build U.S. legal-data applications
Verify provisions by historical date
Receive legal-change alerts
Try the U.S. primary-law open dataset
Features
U.S. primary-law coverage
Covers the codes, regulations, constitutions, procedural rules, and presidential executive documents of the federal government, 50 states, DC, and Puerto Rico.
Unified legal data
More than 4.9 million provisions in one unified structure, with citations and links to official sources.
Historical point-in-time queries
Use the asOf parameter to query provisions from a past date and identify the published-version or historical-reconstruction source.
Legal-change alerts
The Business plan provides signed Webhooks and up to 100 monitoring items to help systems respond automatically to legal changes; every plan includes email alerts.
Pros
- Covers primary law at the federal, state, DC, and Puerto Rico levels
- Every item includes citations and links to official sources
- Supports viewing provisions and source notes by historical date
- Does not log queries or use them for training
Cons
- The Pro plan requires displaying the attribution “Legal data by Vaquill AI” where users access the data