# Library of Congress

**Canonical:** https://apis.io/providers/library-of-congress/  
**Website:** https://www.loc.gov/  
**APIs profiled:** 12

The Library of Congress is the largest library in the world, with millions of books, films and video, audio recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office. The Library publishes a suite of public APIs that expose its catalog, digital collections, historic newspapers, and legislative information.

## Kin Score — 31.3 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 31.3).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 49.3 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 31.0 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Education & Research**: 33.3 (matched via tags).

## Agent readiness — 34.7 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | no |
| 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

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (12)

- **Library of Congress Bills API** — The Bills API from Library of Congress — 3 operation(s) for bills.
- **Library of Congress Collections API** — The Collections API from Library of Congress — 2 operation(s) for collections.
- **Library of Congress Committees API** — The Committees API from Library of Congress — 1 operation(s) for committees.
- **Library of Congress Congressional Record API** — The Congressional Record API from Library of Congress — 1 operation(s) for congressional record.
- **Library of Congress Issues API** — The Issues API from Library of Congress — 1 operation(s) for issues.
- **Library of Congress Items API** — The Items API from Library of Congress — 1 operation(s) for items.
- **Library of Congress Laws API** — The Laws API from Library of Congress — 1 operation(s) for laws.
- **Library of Congress Members API** — The Members API from Library of Congress — 2 operation(s) for members.
- **Library of Congress Pages API** — The Pages API from Library of Congress — 1 operation(s) for pages.
- **Library of Congress Resources API** — The Resources API from Library of Congress — 1 operation(s) for resources.
- **Library of Congress Search API** — The Search API from Library of Congress — 1 operation(s) for search.
- **Library of Congress Titles API** — The Titles API from Library of Congress — 3 operation(s) for titles.

## Agentic access (1)

- **Library Of Congress Agentic Access** — 18 operations

## Security (3)

- **Library Of Congress Authentication** — apiKey · 1 scheme
- **Library Of Congress Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Library Of Congress Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Library Of Congress Plans Pricing**

## Tags

Cultural Heritage, Federal-Government, Library, Legislative, Newspapers, Search

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