Vaquill AI

What It Does

Vaquill AI is a comprehensive open API for US primary law, delivering machine-readable access to over 5 million legal provisions across all 53 US jurisdictions. The platform provides statutes, regulations, court rules, agency guidance, adjudications, and executive orders—all with source links to official publishers. It serves as the data backbone for AI agents, legal tech products, compliance platforms, research tools, and in-house legal teams that need programmatic access to authoritative legal text.

Who It's For & Key Problems Solved

Vaquill AI is built for legal tech developers, AI teams building agents that need to cite law, compliance professionals tracking regulatory changes, law firms verifying AI-generated legal analysis, and researchers analyzing legal corpora. It solves the fundamental problem of accessing consistent, structured, citable legal data without scraping 53 different government websites—making statutes "verifiable rather than merely findable."

Key Features & Capabilities

• Comprehensive Coverage: 60,170 US Code sections, 222,430 CFR sections, 196,237 Federal Register rules, 1.93M+ state statute sections, 429,297 historical Statutes at Large, 312,132 CFR sections with point-in-time tracking since 1996, 97,025 agency guidance documents across 26 agencies, and 100,920 adjudications from seven federal tribunals

• Citation Resolution: Input any Bluebook or court-printed citation (e.g., 42 U.S.C. § 1983, Cal. Civ. Code § 1946.2) and retrieve the exact provision with structured metadata, breadcrumb navigation, and official source links

• Point-in-Time Access: Query any section as it stood on a past date, with transparent indication of whether the result comes from a published edition or reconstruction

• Change Monitoring: Subscribe to law change alerts via signed webhooks or email, receiving old and new text when provisions are amended

• Multiple Access Methods: REST API for section-by-section lookups, Model Context Protocol (MCP) for Claude/Cursor integration, SQL queries over the public object store, and pre-built vector indexes for AI search applications

• Multiple Formats: Each section available in styled HTML, plain text, official PDF and XML, plus DOCX where publishers provide it

Typical Workflows & Use Cases

Legal AI agents use Vaquill to ground their answers in citable sources. Compliance platforms monitor regulatory changes across jurisdictions. Legal research tools offer point-in-time statutory analysis. Law firms verify AI-generated legal opinions. Developers build without maintaining their own 5M-section corpus or scraping infrastructure.

Integrations & Technical Details

The platform integrates via REST API with up to 10 API keys on Business plans, MCP for direct Claude Desktop integration, SQL over HTTPS via DuckDB (no download required), and webhooks for change alerts. The entire ingestion pipeline is open source. Data refreshes daily for CFR, weekly for US Code, and monthly for state regulations. All data traces to official government publishers (GovInfo, state legislative sites).

What Differentiates It

Vaquill AI is the only API offering point-in-time access, agency guidance from 53 named sources, and federal adjudications—all in one consistent format with official source attribution. It provides usage-based pricing instead of per-seat licensing, free tiers for personal/academic projects, and attribution waivers for Business customers. Used by 1,300+ accounts across 150+ organizations including YC-backed legal tech companies.