# Fatcat

**Canonical:** https://apis.io/providers/fatcat/  
**Website:** https://fatcat.wiki/  
**APIs profiled:** 11

Fatcat is a versioned, user-editable open catalog of published research works maintained by the Internet Archive. It tracks bibliographic metadata, links papers to full-text copies, and preserves access to scholarly publications including journal articles, conference proceedings, and datasets across millions of research works.

## Kin Score — 33.1 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 33.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 58.7 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 11.9 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Education & Research**: 20.4 (matched via tags).

## Agent readiness — 29.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| 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 · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (11)

- **Fatcat auth API** — Helper methods and internal APIs for editor authentication. # TAGLINE
- **Fatcat changelog API** — The **Changelog** is the ordered feed of editgroups which have been # TAGLINE accepted into the catalog. # TAGLINE
- **Fatcat containers API** — **Container** entities represent publication venues like journals, # TAGLINE conference proceedings, book series, or blogs. They group publications # TAGLINE ("releases"). # TAG...
- **Fatcat creators API** — **Creator** entities represent individuals (or organizations, or other # TAGLINE agents) who contribute to the creation of specific releases # TAGLINE (publications). # TAGLINE ...
- **Fatcat editgroups API** — **Editgroups** are sets of changes, each to individual entities in the # TAGLINE catalog. Every edit must be part of an editgroup which is reviewed and # TAGLINE accepted (merge...
- **Fatcat editors API** — **Editors** are human user accounts and bots that make changes to the # TAGLINE Fatcat catalog. # TAGLINE The API allows fetching (and updating) metadata about individual editor...
- **Fatcat files API** — **File** entities represent unique digital files which are full # TAGLINE manifestations of specific releases (publications), such as fulltext PDF # TAGLINE files, JATS XML docu...
- **Fatcat filesets API** — **Fileset** entities represent sets of digital files, as well as locations # TAGLINE where they can be found on the public web. Filesets most commonly # TAGLINE represent datase...
- **Fatcat releases API** — **Release** entities represent specific published versions of a research # TAGLINE work, such as a pre-print, a journal article, a book (or chapter), or a # TAGLINE scholarly bl...
- **Fatcat webcaptures API** — **Web Capture** entities represent archival snapshots of web pages (or # TAGLINE other web resources), which are usually complete manifestations of a # TAGLINE specific release ...
- **Fatcat works API** — **Work** entities group several Release entities which are different # TAGLINE versions of the same abstract piece of research. For example, three # TAGLINE release entities rep...

## Agentic access (1)

- **Fatcat Agentic Access** — 96 operations · 42 acting

## Security (1)

- **Fatcat Authentication** — apiKey · 1 scheme

## Plans (1)

- **Plans**

## Tags

Scholarly, Research, Academic, Open Access, Bibliographic, Publications, Metadata, Internet Archive

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