ATF eRegulations API
A read-only JSON API over the ATF regulations in Title 27 of the Code of Federal Regulations — Parts 447, 478, 479, 555, 646 and 771 — served by ATF's eRegulations deployment. It exposes the full nested regulation text tree at any effective version, the Federal Register notices that amended it with their verbatim amendment instructions, version-to-version diffs, and full-text search. Every state of a regulation is identified by the Federal Register document number that produced it, so regulation text and rulemaking history join on a single key. Anonymous, free and unmetered; ATF publishes no OpenAPI for it, and the description in this repository was modeled by API Evangelist from live probes.
ATF eRegulations API is one of 5 APIs that Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Regulations, Federal-Government, Firearms, Explosives, and Compliance. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.
This API exposes 7 operations across 7 paths, organized into 4 resource areas, and defines 10 schemas. It is described by OpenAPI 3.1.0, at version 2026-09-05.
Requests are made against a single base URL, https://regulations.atf.gov/api.
Metadata
The identity and technical contract details declared by the specification.
Paths & Operations 7
Across 7 paths, the API surfaces 7 operations — 7 GET. They span 4 resource areas: Regulations, Notices, Diffs, Search. Each is listed below with its method, path, parameters, and response codes.
The CFR part tree and its effective versions.
Federal Register notices that amend the ATF parts.
Structural differences between two versions of a part.
Full-text search across regulation text.
Schemas 10
The contract defines 10 schemas that model the data the API accepts and returns. The most detailed are Notice (20 properties), SearchHit (9 properties), RegulationNode (6 properties), NoticeSummary (4 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
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