# Crossref

**Canonical:** https://apis.io/providers/crossref/  
**Website:** https://www.crossref.org/  
**APIs profiled:** 8

Crossref is a non-profit organization that provides digital infrastructure for scholarly communications. Best known for Digital Object Identifier (DOI) registration, Crossref also operates a public REST API offering searchable, filterable access to metadata for tens of millions of scholarly works, journals, members, funders, prefixes, types, licenses, and DOI registration agency information. The Crossref REST API supports free-form queries, field queries, filters, facets, deep-paging cursors, and selection of specific elements, and is used by reference managers, repositories, discovery layers, and analytics platforms.

## Kin Score — 32.0 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 32.0).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 53.3 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Education & Research**: 31.5 (matched via tags).

## Agent readiness — 24.5 (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 | 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 — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (8)

- **Crossref Agency API** — The Agency API from Crossref — 1 operation(s) for agency.
- **Crossref Funders API** — Endpoints that expose funder related data
- **Crossref Journals API** — Endpoints that expose journal related data
- **Crossref Licenses API** — Endpoints that expose license related data
- **Crossref Members API** — Endpoints that expose member related data
- **Crossref Prefixes API** — Endpoints that expose prefix related data
- **Crossref Types API** — Endpoints that expose type related data
- **Crossref Works API** — Endpoints that expose works related data

## Agentic access (1)

- **Crossref Agentic Access** — 18 operations

## Security (2)

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

## Plans (1)

- **Crossref Plans Pricing**

## Tags

Citations, DOI, Funders, Identifiers, Journals, Licenses, Members, Metadata, Open Access, ORCID, Prefixes, Publishers, Reference Linking, ROR, Scholarly

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