Crossref was created back in 2000 by 12 forward-thinking scholarly publishers from North America and Europe, and by 2002, these members had registered 4 million DOI records. At the time of writing, we have over 23,600 members in 164 different countries. Half of our members are based in Asia, and 35% are universities or scholar-led. These members have registered over 176 million open metadata records with DOIs (as of today). What a difference 25 years makes!
In our 25th anniversary year, I thought it would be time to take a look at how we got here. And so—hold tight—we’re going to go on an adventure through space and time1, stopping every 5 years through Crossref history to check in on our members. And we’re going to see some really interesting changes over the years.
The Frankfurt Book Fair is the largest book fair in the world, and therefore a key event on our calendar. Held annually in Frankfurt, Germany, the 77th Frankfurt Book Fair (October 15–19, 2025) saw 118,000 trade visitors and 120,000 private visitors from 131 countries. The Crossref booth was located, as usual, in Hall 4.0 where all the stands with information about academic publishing can be found. Four Crossref colleagues attended the Book Fair this year, and in this blog post, you can read more about their meetings, experiences, and plans.
TL;DR. Metadata Manager will be retired at the end of 2025. Over the past four years, we have been developing a new helper tool to replace it, and that tool has now reached a stage of maturity that means we will be able to switch off Metadata Manager by the end of the year.
Our REST API makes all of the metadata we hold publicly available. It receives the majority of our API traffic, with around 1 billion hits per month. It’s one of the key ways that we fulfil our mission to make research objects easy to find, cite, link, assess, and reuse. From 1 December 2025, we will be revising the rate limits for the public and polite pools of the REST API to ensure that we can maintain a stable and reliable system, and that metadata is freely available to everyone.
When Crossref began over 20 years ago, our members were primarily from the United States and Western Europe, but for several years our membership has been more global and diverse, growing to almost 18,000 organisations around the world, representing 148 countries.
As we continue to grow, finding ways to help organisations participate in Crossref is an important part of our mission and approach. Our goal of creating the Research Nexus—a rich and reusable open network of relationships connecting research organisations, people, things, and actions; a scholarly record that the global community can build on forever, for the benefit of society—can only be achieved by ensuring that participation in Crossref is accessible to all. Building a network for the global community must include input from all of the global community.
Although Crossref membership is open to all organisations that produce scholarly and professional materials, cost and technical challenges can be barriers to joining for many organisations. To address some of these challenges, we created our Sponsors Program, which provides technical, financial and local language support. We also collaborate with the Public Knowledge Project on the Open Journals Platform to develop plugins for OJS users.
Additionally, we had a limited ‘fee assistance’ program to waive the content registration fees for members working under specific Sponsor arrangements, including INASP, and African Journals Online (AJOL). Learning from the experiences of such successful partnerships, starting in January 2023, we are expanding this program to provide greater membership equitability and accessibility to organisations located in the least economically-advantaged countries in the world through our Global Equitable Membership (GEM) Program. This new scheme now encompasses the annual fee as well as the content registration fees.
Eligibility for the program is based on a member’s country. We have curated the list, predominantly based on the International Development Association (IDA) list and excluding anywhere we are bound by international sanctions. From January 2023, organisations based in countries listed in our GEM program will be eligible to join Crossref and contribute with their metadata to a robust scholarly record at no cost. This also applies to 187 existing members in eligible countries who will no longer be charged for Crossref membership or content registration.
Existing Crossref members in GEM-eligible countries
Bangladesh (54)
Burundi (1)
Kiribati (0)
Kyrgyz Republic (20)
Central African Republic (1)
Lesotho (0)
Nepal (19)
Democratic Republic of the Congo (1)
Liberia (0)
Ghana (15)
Guyana (1)
Marshall Islands (0)
Yemen (10)
Haiti (1)
Mauritania (0)
Sudan (7)
Honduras (1)
Micronesia (0)
Tanzania (7)
Laos (1)
Mozambique (0)
Afghanistan (6)
Madagascar (1)
Nicaragua (0)
Ethiopia (5)
Malawi (1)
Niger (0)
Zambia (5)
Maldives (1)
Samoa (0)
Bhutan (4)
Myanmar (1)
Sao Tome and Principe (0)
Rwanda (4)
Cambodia (1)
Sierra Leone (0)
Tajikistan (4)
Chad (1)
Solomon Islands (0)
Kosovo (3)
Comoros (1)
South Sudan (0)
Senegal (3)
Cote d’Ivoire (1)
Togo (0)
Uganda (3)
Djibouti (1)
Tonga (0)
Burkina Faso (2)
Eritrea (1)
Tuvalu (0)
Mali (2)
Gambia (1)
Vanuatu (0)
Somalia (2)
Guinea (1)
Benin (1)
Guinea-Bissau (1)
The list of countries will undergo an annual review, to follow the latest guidance from IDA, which uses the somewhat simplistic World Bank income classifications but applies a more granular blend of criteria for economic health, thereby allowing for greater nuance, such as indicating countries where the gap between rich and poor is very wide.
The program results from our experience working with and knowing the communities through Sponsors and working with past members who have struggled to pay. It aims to bring us closer to our vision of building an inclusive, rich and open network of relationships underpinning the scholarly record. With the support of the Membership and Fees Committee, the launch of the program was confirmed with the recent unanimous vote of our Board to evolve our fee assistance program into a more expansive scheme. GEM presents a more comprehensive and equitable solution than our former arrangements. It involves an opportunity to join Crossref and contribute scholarly metadata to our global community on a zero-fee basis for membership and content registration. This offering will be applied by default to organisations based in all eligible countries, irrespective of joining through any specific Sponsor, or independently.
While the GEM Program will alleviate financial barriers, and we hope to see the numbers above grow significantly, the GEM program will not necessarily help ease technical or administrative burdens. We still need our valued Sponsors for that and we seek new Sponsors in the above locations. We would love to hear from organisations based in GEM countries who might consider becoming a Sponsor or otherwise support local colleagues in building experience of metadata and working with global open scholarly infrastructure systems like Crossref. Please reach out to me to discuss ideas or with any other questions or comments.
