# eCFR

**Canonical:** https://apis.io/providers/ecfr/  
**Website:** https://www.ecfr.gov  
**APIs profiled:** 3

Electronic Code of Federal Regulations REST API for accessing the official US Code of Federal Regulations, searching regulations, and retrieving regulatory version history.

## Kin Score — 31.2 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 31.2).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 44.1 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Government & Public Sector**: 31.5 (matched via tags).

## Agent readiness — 26.3 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (3)

- **eCFR Admin Service API** — Access eCFR metadata through JSON
- **eCFR Search Service API** — Historical search of the eCFR
- **eCFR Versioner Service API** — Access CFR content and structure files through JSON and XML

## Agentic access (1)

- **Ecfr Agentic Access** — 15 operations

## Security (2)

- **Ecfr Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Ecfr Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Ecfr Plans Pricing**

## Tags

Federal Regulations, Government, Legal, Compliance, Open Data, United States

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/ecfr/). Scores are computed from the provider's own public artifacts under a published rubric.