# Project Gutenberg

**Canonical:** https://apis.io/providers/gutenberg/  
**Website:** https://www.gutenberg.org/  
**APIs profiled:** 1

Project Gutenberg is a free ebook library providing access to over 75,000 public domain books via the Gutendex REST API. The API enables developers to search and retrieve bibliographic metadata for books and authors, filter by language, copyright status, topic, and MIME type, and access download links for multiple formats including EPUB, Kindle, HTML, and plain text. Project Gutenberg has pioneered free ebooks since 1971 and the Gutendex API makes its catalog programmatically accessible via a simple JSON REST interface with no authentication required.

## Kin Score — 28.5 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 28.5).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 28.2 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 52.6 |
| Developer Ergonomics | 11.9 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

Regulatory layer — **Education & Research**: 11.1 (matched via tags).

## Agent readiness — 18.4 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| 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 | no |

## Access

Free · Open access — onboarding: open, pricing: free, trial: no (confidence: medium).

## APIs (1)

- **Gutendex API** — Gutendex is a JSON web API for Project Gutenberg ebook metadata. It provides access to the catalog of 75,000+ public domain books with filtering by language, copyright status, t...

## Security (1)

- **Gutenberg Domain Security** — TLSv1.3

## Plans (1)

- **Gutenberg Plans Pricing**

## Tags

Books, Ebooks, Public Domain, Literature, Library, Metadata, EPUB

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