≈ 17.6kvisits/mo
Use not read yet · estimate, read Oct 14, 2026
- For
- Developers and AI agents who need free, programmatic read-only access to US federal regulations
- Activity
- Actively maintainedsite updated 11 days ago
- Runs as
- API
- Used for
- search federal regulations through the free JSON API
- browse current titles of the Code of Federal Regulations
- open dated historical annual CFR editions for comparison
- Has an MCP server (2 in the registry)public registry →
- Publishes llms.txt, a file written for AI assistantsecfr.io ↗
- Trust centertheir owntrust center ↗
These are Ecfr's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.
- MCP serverio.ecfr/ecfrverified in the MCP registry
- Stateanswers, 3 toolschecked 2026-10-15
- Address to connectecfr.io/mcp
- OpenAPI spec3 pathsthe spec ↗
- API docsecfr.io/developersthe vendor's page ↗
This card as JSON, for your agent →
Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.
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betaThree tools from the Atlas for the job you describe, each with what fits and what does not.
No notes yet. What do you use Ecfr for?
Sign in to leave a noteWhat is Ecfr?
Lets users search and read current and dated editions of US federal regulations, with a JSON interface for programmatic and AI agent access.
Who is Ecfr for?
Developers and AI agents who need free, programmatic read-only access to US federal regulations
Is Ecfr still maintained?
Actively maintained: site updated 11 days ago.
Is Ecfr safe?
We do not audit vendors. What Ecfr publishes, read 2026-10-15: a trust center.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.
How we read every tool → · By INITE Atlas Desk