# ecfr-io

**Canonical:** https://apis.io/providers/ecfr-io/  
**Website:** https://ecfr.io/  
**APIs profiled:** 1

eCFR.io provides free, read‑only JSON API and MCP server access to the Electronic Code of Federal Regulations (eCFR). Users can search, browse, and retrieve current and historical federal regulations without authentication. The service includes an OpenAPI specification, developer guides, and example usage, supporting cross‑origin requests for applications and AI agents.

## Kin Score — 28.0 / 100 (thin)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 62.5 |
| Contract Quality | 41.0 |
| Contract Governance | 18.2 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 35.0 |
| Access Clarity | 10.5 |

Regulatory layer — **Government & Public Sector**: 14.7 (matched via tags).

## Agent readiness — 27.3 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | paginated |
| Operation Distinctiveness | na |

## APIs (3)

- **ecfr-io Document API** — The Document API from ecfr-io — 1 operation(s) for document.
- **ecfr-io Search API** — The Search API from ecfr-io — 1 operation(s) for search.
- **ecfr-io Titles API** — The Titles API from ecfr-io — 1 operation(s) for titles.

## Agentic access (1)

- **Ecfr Io Agentic Access** — 3 operations

## Security (1)

- **Ecfr Io Domain Security** — TLSv1.3 · HSTS

## Tags

Government, Law, Regulations, API, OpenData, Free

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