Crossref membership is open to publishers of original scholarly content. Crossref’s Affiliate programs are for organizations that are not primary publishers but want to retrieve Crossref DOIs (Digital Object Identifiers) and bibliographic metadata for persistent linking to publisher full text.
Crossref Affiliates have access to bibliographic metadata and permanent Crossref DOI links to over 48 million journal articles, books, book chapters and conference proceedings articles. Crossref Affiliates can create permanent links to the over 3500 Crossref member publishers’ content without signing bi-lateral linking agreements and without having to track publishers' individual linking schemes.
Crossref Affiliates can also use Crossref metadata as an alerting system to track what gets published since metadata is added to Crossref at the same time the content is published online.
Crossref Affiliates may use Crossref system interfaces to discover, display and retrieve bibliographic metadata and Crossref DOIs and use them to create permanent links to publishers’ full text.
Types of Affiliates
- Crossref Service Provider
- Crossref Query Account Affiliate
- Enhanced Crossref Metadata Services (CMS) Affiliate
- Basic Crossref Metadata Services (CMS) Affiliate
- End-User Lookup Affiliate
- Journal and book hosting platforms
- OpenURL Link Resolver providers
- Copyediting and data entry services
See a list of Crossref Service Providers.
The Crossref Service Provider program allows organizations to deposit and/or query the Crossref System on behalf of Crossref Member Publishers or Library Affiliates, using those organizations’ own query accounts.
Crossref Service Providers normally serve as Crossref technical contacts for their clients. They must therefore be familiar with the query process (and deposit process if working for publishers), as explained on the "Getting started" page of the Crossref Help System.
See "Using a local link resolver" in the Crossref Help System for more information on how Library Affiliates and Crossref Service Providers can work together to set up a local link system.
See information on Crossref Service Provider Fees.
To Sign Up
Crossref Service Providers must sign the Crossref Affiliate Agreement. In addition, publishers and libraries that want the Crossref Service Provider to act on their behalf must sign a Membership or Library Affiliate Agreement with Crossref and indicate that the Affiliate is authorized to act as their agent. Crossref does not charge libraries to become Library Affiliates.
Crossref Service Providers requiring their own query accounts must also become Crossref Query Affiliates.
- Abstracting and Indexing (A&I databases)
- Other secondary services
- Content aggregators
- Reference management services
See a list of Crossref Query Affiliates which includes Library Affiliates and End-User Affiliates.
The Crossref Query Account is appropriate for organizations looking to add Crossref DOIs and metadata to their services and databases and to add permanent Crossref DOI links to full text at Crossref Member Publishers’ sites.
Organizations use the Crossref Query Account to add Crossref metadata and DOIs to their own services and databases. Query Account Affiliates must pay the relevant Crossref Query Affiliate Fees.
Crossref Query Affiliates get their own query account on the Crossref system. This account supports single or bulk queries that take advantage of Crossref’s sophisticated fuzzy matching algorithms. Crossref Query Affiliates submit and receive queries in XML format. More technical information about querying is available in the Crossref Help System.
See information on Crossref Query Affiliate Fees.
To Sign Up
Crossref Query Affiliates sign the Crossref Affiliate Agreement. Crossref Query Affiliates who need to query and/or deposit on behalf of other publishers or libraries must also become Crossref Service Providers.
For a print-friendly summary please see our Query Affiliate handout (PDF).
- Content aggregators
- Search engines
- Document delivery services
- Article level discovery services
- Providers of citation metrics
- Other organizations that need bibliographic data from scholarly publishers
See a list of Enhanced CMS Affiliates.
Enhanced CMS Affiliates get access to bulk files of Crossref Metadata.
In addition, the Enhanced CMS license has broader reuse terms than the Basic CMS license.
- It allows Enhanced CMS Affiliates to combine Crossref Metadata from data the Affiliate may have acquired from other sources.
- Enhanced CMS Affiliates are not obligated to display the Crossref DOI (although if the Crossref DOI is displayed, it must link to the publisher’s full text).
- Enhanced CMS Affiliates can also receive access to reference metadata deposited by Crossref Members participating in Crossref’s Cited-By Linking service, if the publishers agree to the uses defined by the Enhanced CMS Affiliate.
- The license also includes the ability to create citation metrics from the Crossref data.
Please see our Enhanced CMS page for more information.
An Enhanced Crossref Metadata Services Affiliate has access to bulk files of Crossref Metadata through an OAI-PMH Interface. More information on Crossref’s OAI-PMH interface is available in the Crossref Help System.
Because of the expanded license, Enhanced CMS Affiliates are subjected to an opt-out process for each Crossref Member. Crossref Member Publishers can elect whether to participate with any individual Enhanced CMS Affiliate.
See information on Enhanced CMS Fees.
To Sign Up:
Please contact Crossref and request information about becoming an Enhanced CMS affiliate member.
Any non-publisher organization that needs to link to publisher full text through Crossref DOIs that wants to host the Crossref data locally.
A Basic Crossref Metadata Services Affiliate receives a license to locally host the Crossref database of bibliographic metadata and Crossref DOIs. Basic CMS Affiliates pull data from Crossref in order to look up Crossref DOIs within their own systems without querying Crossref over the Internet.
The data is delivered in XML format. Basic CMS Affiliate must have the infrastructure to load and query the information. Basic CMS Affiliates must display Crossref DOIs and use them to link to the publisher full text.
Basic CMS Affiliates use the FTP protocol to download data to their local systems. See the Crossref Help pages for more information on how local hosting works.
See information on Basic CMS Fees.
To Sign Up:
Please contact Crossref and request information about becoming a Basic CMS affiliate member.
Organizations that need to integrate Crossref DOI look-up services into their reference or content services.
See a list of our End-User Lookup Affiliates.
End User Affiliates enable users to perform one-at-a-time queries for Crossref DOIs and metadata. They do not store the Crossref DOIs or metadata retrieved from the Crossref system.
Access to the lookup services are through Crossref’s OpenURL interface rather than through our web query system, which is not appropriate for real-time lookups. More information on the OpenURL interface is available in the Crossref Help System.
There is no charge from Crossref for End-User Lookup Affiliates nor for the researchers who use these systems.
For a print-friendly summary please see our Crossref for Affiliates handout (PDF).
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