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The Vaquill Developer API is the deepest US statutes and regulations API. Search and retrieve the US Code, the Code of Federal Regulations, nearly all 50 state statutory codes plus DC and Puerto Rico, state and US constitutions, court rules, executive orders, Federal Register agency rules, and agency guidance. Every section comes back with a citation, full text in multiple formats, and a link to the official government source. It is built for grounding AI (RAG and agents), compliance and RegTech, and embedding authoritative legal text into your product.

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Endpoints at a glance

Every path is prefixed with /api/v1.
Coverage expands weekly. Call /statutes/coverage at runtime to see exactly what is queryable rather than hardcoding jurisdiction counts.

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What you can build

Use cases

Grounding AI, compliance mapping, legal research tools, and more.

RAG grounding

Feed authoritative statute text to an LLM in your stack, with citations and source links.

Compliance mapping

Map obligations to the statutes and regulations that govern them.

Statute chatbot

Answer statute questions in your product, grounded in official text.

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Get started

Quickstart

Make your first search and fetch a section in a few minutes.

Authentication

Create an API key and authenticate every request.

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Positioning

Vaquill complements your existing legal research tools. It is built to ground and power products, always linking back to official government text, not to replace a lawyer or a licensed research service.

Coverage

The jurisdiction matrix in human-readable form.