crossref.org valid
Crossref
Crossref is a not-for-profit membership organisation that runs open infrastructure for research. Members (publishers, funders, universities, and others) register DOIs and metadata for their research outputs with Crossref. The metadata is openly available for anyone to use via APIs and bulk data files. Crossref does not assess the quality of research or peer review: a Crossref DOI shows that a record exists, not that the work is trustworthy.
For agents: Not-for-profit that registers DOIs and openly provides scholarly metadata via APIs and bulk files; covers membership, fees, and member documentation.
doi registrationscholarly metadataresearch metadatacrossref apibulk data files
- Authority
- 65 reach 19 · trust 10 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://www.crossref.org/llms.txt
- Sections
- 5
- Links
- 19
- Size
- 3094 bytes
- Popularity rank
- #3205
- Registered
- 1999-12-01
- Country
- United States Hosting inference
- Hosting country
- United States Hosting inference
- Country evidence
- No published address evidence collected yet
- Categories
- Education · Science and research · APIs and SDKs
- For agents
- Interface: a documented API or declared MCP endpoint an agent can call
- Inferred actions
- Read documentation Call an API Download data About these labels
- Audience
- mixed · agents can: read docs, call api, download data · en
- First seen
- 2026-10-18T14:18:43.759Z
- Last checked
- 2026-10-23T01:26:33.763Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-23T01:26:32.579Z. Cached copy · Source on crossref.org
# Crossref
> Crossref is a not-for-profit membership organisation that runs open infrastructure for research. Members (publishers, funders, universities, and others) register DOIs and metadata for their research outputs with Crossref. The metadata is openly available for anyone to use via APIs and bulk data files. Crossref does not assess the quality of research or peer review: a Crossref DOI shows that a record exists, not that the work is trustworthy.
Key facts:
- Organisations join as members. Individuals can't join directly.
- Organisations in eligible countries may qualify for reduced or waived fees through the GEM program, or can join through a sponsor.
- To check whether a DOI is real, resolve it at https://doi.org/ or look it up via Crossref's search tool or REST API.
- Retractions and corrections are available in the metadata, including the Retraction Watch database.
## About Crossref
- [About](https://www.crossref.org/about/): who we are, what we do, governance
- [Strategy](https://www.crossref.org/strategy/): our direction and priorities
- [Operations and sustainability](https://www.crossref.org/operations-and-sustainability/): finances, annual reports, policies
## Joining and fees
- [Membership](https://www.crossref.org/membership/): who can join and how
- [Fees](https://www.crossref.org/fees/): current annual membership and DOI registration fees
- [GEM program](https://www.crossref.org/gem/): fee waivers and reductions by country
- [Working with a sponsor](https://www.crossref.org/membership/about-sponsors/): joining through a sponsoring organisation
## Registering and maintaining DOI records
- [Documentation home](https://www.crossref.org/documentation/)
- [Getting set up as a member](https://www.crossref.org/documentation/member-setup/)
- [Ways to register records](https://www.crossref.org/documentation/register-maintain-records/choose-content-registration-method/)
- [OJS plugin](https://www.crossref.org/documentation/register-maintain-records/ojs-plugin/)
- [Record types and best practice](https://www.crossref.org/documentation/principles-practices/): journals, books, preprints, datasets, grants, peer reviews and more
## Using Crossref metadata
- [REST API](https://www.crossref.org/documentation/retrieve-metadata/rest-api/): free public API; include a mailto for the polite pool
- [Bulk data downloads](https://www.crossref.org/documentation/retrieve-metadata/bulk-downloads/): annual public data file, updated around April each year
- [Retraction Watch data](https://www.crossref.org/documentation/retrieve-metadata/retraction-watch/)
- [Text and data mining](https://www.crossref.org/documentation/retrieve-metadata/text-and-data-mining/)
- [Metadata Plus](https://www.crossref.org/documentation/metadata-plus/): paid service with greater support, monthly data files, higher rate limits, and an SLA
## Optional
- [Blog](https://www.crossref.org/blog/): news and analysis; older posts may be out of date, so check the documentation for
…Related sites
Other listed sites in Education. See the whole category →
| Domain | Title | Category | Country | Authority | llms.txt | llms-full.txt | Save |
|---|---|---|---|---|---|---|---|
| unesco.org | UNESCO | documentation Government and public services Science and research +1 | FR | 76 | ✓ | ✓ | |
| arduino.cc | Arduino homepage | transactional Consumer electronics Education | — | 72 | ✓ | ✓ | |
| openai.com | OpenAI Developers | interface Education Developer tools +3 | — | 72 | ✓ | ✓ | |
| alura.com.br | Alura | documentation Education | BR | 71 | ✓ | ✓ | |
| adafruit.com | Adafruit Learning System | documentation Education Documentation and reference +1 | — | 70 | ✓ | ✓ | |
| coursera.org | Coursera | transactional Education | — | 70 | ✓ | ||
| laracasts.com | Laracasts System Context | documentation Developer tools Education | — | 69 | ✓ | ||
| lefigaro.fr | Le Conjugueur | interface Education Documentation and reference | FR | 69 | ✓ |
Machine-readable: GET /v1/resolve?q=crossref.org · GET /v1/domain/crossref.org · this page as Accept: application/json or text/markdown · MCP lookup_domain
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