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Open Access

Score 36.0 / 100 137 providers +55 via APIs 231 APIs Search apis.io →

Providers using this tag (137)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Strong 1 Solid coverage with minor gaps
Delft University of TechnologyUniversityHigher EducationEducationTechnical University1 API57.3
Developing 27 Usable, with meaningful gaps to close
University of CambridgeEducationHigher EducationUniversityResearch1 API50.0Uppsala UniversityUniversityHigher EducationEducationSweden1 API49.4DryadResearch DataOpen ScienceResearch RepositoryDatasets1 API49.0arXivScholarly PublishingPreprintsResearch2 APIs48.1Australian National UniversityUniversityHigher EducationEducationResearch3 APIs47.9TU WienUniversityHigher EducationEducationTechnical University1 API47.1ZenodoResearchOpen DataRepositoryDOI1 API47.1RWTH Aachen UniversityEducationHigher EducationUniversityTechnical University1 API45.9Pennsylvania State UniversityEducationHigher EducationUniversityPublic Research University3 APIs45.8FigshareResearch DataResearch RepositoryOpen ScienceDOI1 API45.7University of TokyoUniversityHigher EducationEducationJapan3 APIs45.3University of SheffieldUniversityHigher EducationEducationUnited Kingdom1 API45.0Utrecht UniversityEducationHigher EducationUniversityNetherlands2 APIs44.3Seoul National UniversityUniversityHigher EducationEducationSouth Korea6 APIs44.2University of Hong KongEducationHigher EducationUniversityHong Kong1 API44.0DeSci LabsCompanyAi Enterprise SoftwareResearch InfrastructureDecentralized Science1 API43.2McMaster UniversityUniversityHigher EducationEducationCanada2 APIs42.8Hamad Bin Khalifa UniversityUniversityHigher EducationEducationResearch1 API42.0University of LisbonUniversityHigher EducationEducationPortugal1 API42.0Erasmus University RotterdamUniversityHigher EducationEducationNetherlands2 APIs41.8University of ReadingUniversityHigher EducationEducationResearch6 APIs41.3University of OttawaUniversityHigher EducationEducationCanada6 APIs40.7University of the WitwatersrandUniversityHigher EducationEducationResearch2 APIs40.7Semantic ScholarAcademicResearchPaperCitations3 APIs39.9University of CalgaryEducationHigher EducationUniversityPublic Research University2 APIs39.9University of YorkUniversityHigher EducationEducationUnited Kingdom6 APIs39.9National Center for Biotechnology Information (NCBI)BioinformaticsGenomicsLife SciencesPubMed1 API39.6
Thin 76 Limited public surface area
Al-Farabi Kazakh National UniversityEducationHigher EducationUniversityResearch1 API39.0Kyoto UniversityUniversityHigher EducationEducationJapan2 APIs39.0Smithsonian InstitutionMuseumsCultural HeritageCollection1 API39.0Université de MontréalUniversityHigher EducationEducationCanada2 APIs39.0Carnegie Mellon UniversityUniversityHigher EducationEducationUnited States6 APIs38.7Nanyang Technological UniversityUniversityHigher EducationEducationSingapore3 APIs38.7Karlsruhe Institute of TechnologyEducationHigher EducationUniversityTechnical University9 APIs38.6University of BirminghamEducationHigher EducationUniversityUnited Kingdom1 API38.3EPFLUniversityHigher EducationEducationTechnical University3 APIs38.2University College DublinUniversityHigher EducationEducationIreland2 APIs38.2Université libre de BruxellesUniversityHigher EducationEducationBelgium4 APIs38.2Technical University of BerlinUniversityHigher EducationEducationTechnical University8 APIs38.0Springer NatureScholarly PublishingResearchScholarly Content2 APIs37.8Massey UniversityEducationHigher EducationUniversityNew Zealand4 APIs37.6University of OxfordUniversityHigher EducationEducationResearch4 APIs36.9Nekosia APIAnimenekonekosneko api1 API36.0University of PittsburghUniversityHigher EducationEducationUnited States1 API36.0University of TübingenEducationHigher EducationUniversityGermany8 APIs35.7Indian Institute of Technology KanpurEducationHigher EducationUniversityInstitute of Technology2 APIs34.8Tokyo Institute of TechnologyEducationHigher EducationUniversityInstitute of Technology2 APIs34.8Indian Institute of Science BangaloreEducationHigher EducationUniversityIndia1 API34.7King Fahd University of Petroleum & MineralsUniversityHigher EducationEducationResearch6 APIs34.6Imperial College LondonUniversityHigher EducationEducationRussell Group1 API34.5University of LiverpoolEducationHigher EducationUniversityRussell Group14 APIs33.7University of Los Andes ColombiaUniversityHigher EducationEducationColombia2 APIs33.7Kyushu UniversityUniversityHigher EducationEducationResearch2 APIs33.5Nagoya UniversityEducationHigher EducationUniversityJapan5 APIs33.3Universiti Sains MalaysiaUniversityHigher EducationEducationPublic Research University4 APIs33.1Sungkyunkwan UniversityUniversityHigher EducationEducationResearch6 APIs32.9Victoria University of WellingtonUniversityHigher EducationEducationNew Zealand6 APIs32.7Keio UniversityEducationHigher EducationUniversityJapan4 APIs32.6TU DresdenUniversityHigher EducationEducationGermany7 APIs32.6Friedrich-Alexander-Universität Erlangen-NürnbergUniversityHigher EducationEducationResearch9 APIs32.5Maastricht UniversityUniversityHigher EducationEducationNetherlands1 API32.3FatcatScholarlyResearchAcademic1 API32.0Universität HamburgEducationHigher EducationUniversityGermany2 APIs32.0University of BaselUniversityHigher EducationEducationSwitzerland7 APIs31.4Chulalongkorn UniversityEducationHigher EducationUniversityResearch4 APIs31.3Curtin UniversityUniversityHigher EducationEducationResearch4 APIs31.3Hebrew University of JerusalemUniversityHigher EducationEducationResearch2 APIs31.2University of WaikatoEducationHigher EducationUniversityNew Zealand2 APIs31.1CrossrefCitationsDOIFundersIdentifiers1 API30.7bioRxivBiologyPreprintsResearch2 APIs30.6Universiti Kebangsaan MalaysiaUniversityHigher EducationEducationResearch8 APIs30.3École des Ponts ParisTechUniversityHigher EducationEducationTechnical University4 APIs30.3Leiden UniversityUniversityHigher EducationEducationNetherlands9 APIs30.2medRxivHealth SciencesPreprintsResearch1 API30.2Technical University of DarmstadtEducationHigher EducationUniversityTechnical University10 APIs30.0University of NottinghamEducationHigher EducationUniversityRussell Group5 APIs29.9Western UniversityUniversityHigher EducationEducationResearch6 APIs29.9Heriot-Watt UniversityUniversityHigher EducationEducationScotland6 APIs29.7Waseda UniversityUniversityHigher EducationEducationJapan10 APIs29.5Queensland University of TechnologyUniversityHigher EducationEducationAustralia6 APIs29.4Autonomous University of BarcelonaEducationHigher EducationUniversitySpain2 APIs29.3University of GlasgowUniversityHigher EducationEducationUnited Kingdom2 APIs29.3Trinity College DublinUniversityHigher EducationEducationIreland12 APIs29.2Sapienza University of RomeEducationHigher EducationUniversityItaly7 APIs29.1Humboldt-Universität zu BerlinUniversityHigher EducationEducationResearch3 APIs28.8ACM Digital LibraryAcademicBibliographic RecordsCitationsComputing3 APIs28.4National University of SingaporeUniversityHigher EducationEducationSingapore10 APIs27.9Sorbonne UniversityEducationHigher EducationUniversityFrance5 APIs27.7University of St AndrewsEducationHigher EducationUniversityPublic Research University7 APIs27.7University of WollongongEducationHigher EducationUniversityAustralia8 APIs27.7University of SussexUniversityHigher EducationEducationUnited Kingdom5 APIs27.4Qatar UniversityEducationHigher EducationUniversityQatar4 APIs27.3University of ZurichEducationHigher EducationUniversityPublic Research University5 APIs27.2Vrije Universiteit AmsterdamUniversityHigher EducationEducationNetherlands7 APIs27.2Boston UniversityUniversityHigher EducationEducationUnited States1 API27.1University of BernUniversityHigher EducationEducationSwitzerland10 APIs27.1University of PaduaUniversityHigher EducationEducationItaly5 APIs26.7Ohio State UniversityUniversityHigher EducationEducationUnited States1 API26.6Aarhus UniversityUniversityHigher EducationEducationResearch5 APIs26.5Queen Mary University of LondonUniversityHigher EducationEducationResearch11 APIs26.5Universiti Teknologi MalaysiaUniversityHigher EducationEducationPublic Research University6 APIs26.3Norwegian University of Science and TechnologyEducationHigher EducationUniversityResearch7 APIs26.2École Normale Supérieure de LyonUniversityHigher EducationEducationFrance8 APIs26.2
Emerging 24 Early or largely undocumented
University of OtagoUniversityHigher EducationEducationNew Zealand5 APIs25.8American University of BeirutUniversityHigher EducationEducationLebanon11 APIs25.7UnpaywallScholarly ArticlesResearchAcademic1 API25.7Loughborough UniversityEducationHigher EducationUniversityUnited Kingdom7 APIs25.4UCLEducationHigher EducationUniversityUnited Kingdom6 APIs25.1University of AberdeenEducationHigher EducationUniversityResearch10 APIs25.0Universiti Putra MalaysiaUniversityHigher EducationEducationMalaysia6 APIs24.9Universiti Teknologi PETRONASUniversityHigher EducationEducationMalaysia4 APIs24.8University of BolognaEducationHigher EducationUniversityItaly12 APIs24.7Indian Institute of Technology DelhiEducationHigher EducationUniversityInstitute of Technology2 APIs24.6Tohoku UniversityUniversityHigher EducationEducationResearch5 APIs24.6Autonomous University of MadridUniversityHigher EducationEducationSpain9 APIs24.1University of NavarraEducationHigher EducationUniversitySpain2 APIs23.1University of BarcelonaUniversityHigher EducationEducationSpain10 APIs22.6University of CanterburyEducationHigher EducationUniversityNew Zealand8 APIs22.4École Normale Supérieure de ParisUniversityHigher EducationEducationFrance3 APIs22.2University of ChileEducationHigher EducationUniversityPublic University10 APIs22.1Stockholm UniversityEducationHigher EducationUniversityResearch4 APIs21.7Hokkaido UniversityEducationHigher EducationUniversityJapan10 APIs21.5Queen's University BelfastUniversityHigher EducationEducationResearch5 APIs20.5La Trobe UniversityEducationHigher EducationUniversityAustralia3 APIs17.4RMIT UniversityEducationHigher EducationUniversityResearch Data1 API17.4AcademiaCompanyAcademic Researchresearch-papersScholarly Publishing12.6PLOSScientific ArticlesResearchSearchSolr1 API11.6
Minimal 9 Almost no public developer surface
Open Science FrameworkPublic APIsResearch DataResearch Repository1 API6.5COREPublic APIsScholarlyResearch1 API5.5GeoCatGeospatialOGCWMSWFS2 APIs5.3GeoSolutionsGeospatialOGCWMSWFS2 APIs5.3OpenAlexPublic APIsResearch DataScholarlyCitations1 API4.1Deutscher WetterdienstGeospatialOGCWMSWFS1 API3.4Eurac ResearchGeospatialOGCWMSWFS1 API3.4Flanders Marine InstituteGeospatialOGCWMSWFS1 API3.4SpacebelGeospatialOGCWMSWFS1 API3.4

APIs with this tag (231)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 1 Complete, well-documented, and agent-ready
Canonical Open Access APIDo not require the user to authenticate.76.3
Strong 2 Solid coverage with minor gaps
UWSpace DSpace REST APIThe REST backend of UWSpace, the University of Waterloo institutional repository, running DSpace 8.4 on a U...60.4ExchangeRate-API Open Access APIFree no-key endpoint with once-daily rates and attribution requirement.54.4
Developing 50 Usable, with meaningful gaps to close
Apollo Institutional Repository API (DSpace)Cambridge's open-access research repository (Apollo) on the DSpace platform, exposing OAI-PMH metadata harv...50.0Apollo OAI-PMH metadata harvesting endpointOAI-PMH 2.0 harvesting interface for Apollo, the University's institutional repository, served from Cambrid...50.0MINDS@UW OAI-PMH EndpointLive OAI-PMH 2.0 harvesting endpoint for MINDS@UW, UW-Madison's institutional repository. Confirmed with ?v...49.5DiVA OAI-PMHDiVA (Academic Archive On-line) is Uppsala University Library's institutional repository for publications a...49.4PJM Messages Public Web ServiceThe only fully anonymous PJM REST API found on the public surface. It backs the PJM Upcoming Changes page a...49.1Editori (journals.helsinki.fi) OAI-PMH InterfaceOAI-PMH 2.0 endpoint for Editori, the University's open publishing service (PKP Open Journal Systems). Iden...48.8Helda DSpace REST APIPublic HAL REST API for Helda, the University's open institutional repository, running DSpace 7.6.2. Discov...48.8Helda OAI-PMH Metadata InterfaceOAI-PMH 2.0 harvesting endpoint for Helda. Identify returns repositoryName "Helda" with an earliest datesta...48.8ReIn UW Institutional Repository REST APIThe Institutional Repository of the University of Warsaw (ReIn UW, Repozytorium Instytucjonalne Uniwersytet...48.6ReIn UW OAI-PMH EndpointOAI-PMH 2.0 metadata harvesting endpoint for the Institutional Repository of the University of Warsaw. verb...48.6GUPEA DSpace 8 REST APIThe HAL+JSON REST API of the same repository, on the same University host. Verified live 2026-09-01: anonym...48.4UMN Digital Conservancy — OAI-PMH and DSpace RESTThe University of Minnesota Digital Conservancy, which also holds DRUM (Data Repository for the University ...48.0UCSB on eScholarshipUCSB’s open-access scholarship collection inside eScholarship, the University of California’s systemwide re...47.7bonndoc Publication Server OAI-PMH EndpointOAI-PMH 2.0 endpoint for bonndoc, "Der Publikationsserver der Universitaet Bonn" — the university's DSpace-...47.5reposiTUm DSpace REST APIThe DSpace 7 REST layer of reposiTUm is deployed but fronted by a crawler filter: /server/api returned 503 ...47.1reposiTUm OAI-PMHOAI-PMH 2.0 interface for reposiTUm, the open-access institutional repository of TU Wien, implemented on DS...47.1RWTH Publications OAI-PMHRWTH Publications is the institutional repository providing access to the publication output of RWTH Aachen...45.9ETDA OAI-PMH ProviderAn open OAI-PMH 2.0 harvesting endpoint over Penn State's Electronic Theses and Dissertations Archive, serv...45.8Texas ScholarWorks DSpace REST APIPublic DSpace REST API for Texas ScholarWorks, the UT Libraries institutional repository of theses, dissert...45.3Texas ScholarWorks OAI-PMH EndpointOAI-PMH 2.0 metadata-harvesting endpoint for Texas ScholarWorks. An Identify request returns repositoryName...45.3KU Leuven RDR OAI-PMH Harvesting InterfaceOAI-PMH 2.0 interface of the Research Data Repository, served from KU Leuven's own host. Identify returned ...45.1Elsevier Pure CRIS tenancy (REST + OAI-PMH)The University's tenancy of Elsevier Pure, its Current Research Information System, reached at pure.manches...45.0White Rose eTheses Online OAI-PMHWhite Rose eTheses Online is the shared electronic theses repository of the same three universities, runnin...45.0White Rose Research Online OAI-PMHWhite Rose Research Online is the shared open-access outputs repository of the Universities of Leeds, Sheff...45.0Utrecht University Repository OAI-PMHOAI-PMH 2.0 metadata harvesting interface for the Utrecht University Library institutional repository. Veri...44.3Utrecht University Repository REST APIThe DSpace 9.0 HAL/JSON REST API behind the Utrecht University Repository. Openly readable without a key: t...44.3eScholarship — UC Davis unit (tenant)UC Davis's open-access scholarly output is deposited into eScholarship, the University of California's shar...44.1HKU Scholars Hub OAI-PMHHKU Scholars Hub is the University's DSpace-based open-access institutional repository and current research...44.0ResearchWorks Repository (DSpace REST + OAI-PMH)ResearchWorks is UW Libraries' institutional repository, running DSpace 9.2 on UW's own host. The DSpace RE...44.0ResearchSpace OAI-PMH 2.0 ServiceLive OAI-PMH 2.0 metadata harvesting endpoint for ResearchSpace, the University's self-hosted DSpace instit...43.3IRIS PoliTO OAI-PMH Metadata Service (CINECA deployment)OAI-PMH 2.0 harvesting service over IRIS, Politecnico di Torino's institutional research repository, reacha...42.8MacSphere Institutional RepositoryMcMaster University Libraries' institutional repository of theses, dissertations and open-access research o...42.8DSpace Institutional Repository (Central Library)The IIT Bombay Central Library institutional repository, running DSpace over theses, journal articles and c...42.5Elmi Research Portal — OAI-PMHHBKU's research information system, Elmi, runs Elsevier Pure on the university's own subdomain and exposes ...42.0Manara — Qatar Research Repository (HBKU portal)HBKU's scholarly output is deposited in Manara — Qatar Research Repository, a Figshare platform operated by...42.0Repositorio da Universidade de Lisboa — DSpace REST APIAnonymous HAL+JSON REST API of the institution's DSpace 7.6.1 repository — communities, collections, items,...42.0Repositorio da Universidade de Lisboa — OAI-PMHOAI-PMH 2.0 metadata harvesting interface over the DSpace 7.6.1 institutional open-access repository. Opera...42.0IEEE Xplore Open Access APIFull-text retrieval endpoint for articles designated as IEEE Open Access or chargeable open content. Return...41.4eScholarship@McGill on Scholaris (tenant)McGill's institutional research repository, running as a tenant on Scholaris. It exposes a DSpace REST (HAL...41.0OpenEmory Repository (Samvera Hyrax / ResourceSync)OpenEmory is Emory's open-access institutional repository, running Samvera Hyrax 5.2.0 on Emory infrastruct...40.3Harvard DASH institutional repository (4Science-managed DSpace)DASH (Digital Access to Scholarship at Harvard) is Harvard's open-access institutional repository of 58,000...40.2Columbia Academic CommonsColumbia University's institutional research repository, holding the scholarly output, theses and research ...40.1WashU Scholarly Repository (OAI-PMH)The university's institutional repository, "WashU Scholarly Repository", serving a live OAI-PMH 2.0 interfa...40.1Aaltodoc Repository — OAI-PMH and DSpace RESTAalto's institutional repository of theses, articles and conference publications, running Aalto-hosted DSpa...39.9PRISM Institutional Repository (DSpace on Scholaris)PRISM is the University of Calgary's institutional repository — the university's content, the university's ...39.9University of Calgary Journal Hosting (OJS) OAI-PMHThe university's own Open Journal Systems 3.4.0.10 installation, hosting UCalgary scholarly journals and ex...39.9White Rose eTheses Online OAI-PMH (consortium)White Rose eTheses Online is the shared EPrints theses repository of York, Leeds and Sheffield, running on ...39.9White Rose Research Online OAI-PMH (consortium)White Rose Research Online is the shared EPrints institutional repository of the Universities of York, Leed...39.9PMC OAI-PMH ServiceThe PMC OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) service allows bulk harvesting ...39.6PMC Open Access API (OA Service)The PubMed Central Open Access API retrieves citation data, licensing details, and FTP download locations f...39.6
Thin 126 Limited public surface area
KazNU Bulletin OAI-PMH RepositoriesSeven OAI-PMH 2.0 metadata harvesting endpoints operated by Al-Farabi Kazakh National University on its own...39.0KURENAI OAI-PMH APIOAI-PMH 2.0 metadata harvesting interface for KURENAI, the Kyoto University Research Information Repository...39.0PAPYRUS DSpace REST API (HAL)The DSpace 8 REST API behind PAPYRUS, answering anonymously at the HAL root and advertising the repository'...39.0PAPYRUS OAI-PMH Endpoint (institutional repository)OAI-PMH 2.0 harvesting interface for PAPYRUS, Université de Montréal's institutional repository of open-acc...39.0DR-NTU (Digital Repository) — OAI-PMHA fully conformant OAI-PMH 2.0 metadata harvesting endpoint over DR-NTU, serving 11 metadata formats and de...38.7KiltHub Institutional Repository (figshare) — tenantKiltHub is Carnegie Mellon's institutional repository for research data and scholarly output. The data, the...38.7KITopen OAI-PMH InterfaceKITopen is KIT's central open-access institutional repository for the bibliographic data, full texts, image...38.6ePapers Repository (EPrints OAI-PMH)OAI-PMH 2.0 metadata harvesting interface for the University of Birmingham ePapers EPrints repository, hold...38.3UBIRA eTheses (EPrints OAI-PMH)OAI-PMH 2.0 metadata harvesting interface for the University of Birmingham eTheses EPrints repository, hold...38.3EPFL Infoscience Institutional RepositoryInfoscience is EPFL's institutional repository and CRIS, self-hosted on EPFL infrastructure and running DSp...38.2DepositOnce DSpace REST APIDSpace 9.4 REST/HAL API for DepositOnce, exposing communities, collections, items, bitstreams, discovery, v...38.0DepositOnce OAI-PMH InterfaceOpen Archives Initiative Protocol for Metadata Harvesting (OAI-PMH 2.0) endpoint for DepositOnce, TU Berlin...38.0Springer Nature Open Access APIThe Open Access API from Springer Nature — 2 operation(s) for open access.37.8PubMed Central (PMC) OA APIAPIs for programmatic access to PubMed Central's Open Access content, including file validation, Open Acces...37.7ORCA OAI-PMH InterfaceOnline Research @ Cardiff (ORCA) is Cardiff University's own EPrints institutional repository, listed as an...37.5OpenUCT DSpace REST APIThe OpenUCT repository additionally exposes the DSpace 7 REST API anonymously at open.uct.ac.za/server/api,...37.2OpenUCT Institutional Repository OAI-PMHOpenUCT is the University of Cape Town's open access institutional repository, running DSpace 7.4 on UCT's ...37.2UCSF scholarly output via eScholarship OAI-PMHUCSF's open-access scholarly output is harvestable as a named OAI-PMH set on the University of California's...37.1ScholarlyCommons at Penn — DSpace REST APIDSpace 7.6 HAL+JSON REST API on Penn's own host. The API root returned HTTP 200 advertising dspaceName "Sch...37.0ULS E-Journal Publishing — OAI-PMH 2.0 providersThe University Library System publishes dozens of open-access journals on PKP Open Journal Systems that ULS...36.0TOBIAS-lib / Publikationssystem UB Tübingen OAI-PMHOAI-PMH 2.0 provider for the University Library's institutional publication server (TOBIAS-lib), running DS...35.7IIT Kanpur PKK Library OAI-PMH APIOAI-PMH 2.0 metadata-harvesting endpoint for the P.K. Kelkar Library catalog, operated on the institution's...34.8Science Tokyo Repository OAI-PMH (JAIRO Cloud tenant)OAI-PMH 2.0 endpoint for the institution's tenancy on JAIRO Cloud — the successor repository named in the T...34.8ePrints@IISc OAI-PMHePrints@IISc is the open-access institutional repository of IISc research publications, established in 2002...34.7ETD@IISc DSpace 6 REST APIRead-only REST API of ETD@IISc, the Electronic Theses and Dissertations repository IISc runs on DSpace 6 at...34.7Journal of the Indian Institute of Science OAI-PMHLive OAI-PMH 2.0 metadata-harvesting provider for the Journal of the Indian Institute of Science, served fr...34.7Spiral OAI-PMH Metadata Harvesting EndpointA fully functional OAI-PMH 2.0 harvesting interface — the standards-based way Imperial's research outputs r...34.5Spiral Open Access Repository (DSpace 7 REST API)Imperial's institutional open-access repository, exposed over the DSpace 7 HAL+JSON REST API at https://spi...34.5Project MUSE OAI-PMH RepositoryProject MUSE, operated by Johns Hopkins University Press, exposes an OAI-PMH 2.0 harvesting endpoint that a...34.2Repositorio Institucional Seneca - DSpace REST APIDSpace 7 REST API for the "Seneca" repository, under the /server/api path of the deployment. Confirmed to b...33.7Repositorio Institucional Seneca - OAI-PMHOAI-PMH metadata harvesting interface for "Seneca", the DSpace 7 institutional repository that collects the...33.7University of Liverpool Repository EPrints RESTKeyless, read-only EPrints REST interface on the institutional repository. Verified live 2026-09-01: GET /r...33.7University of Liverpool Repository OAI-PMHOAI-PMH 2.0 metadata-harvesting interface for the University of Liverpool Repository, an EPrints 3.4.5 open...33.7NAGOYA Repository OAI-PMH (NII WEKO3 / JAIRO Cloud tenant)OAI-PMH 2.0 metadata harvesting interface for the NAGOYA Repository, Nagoya University's institutional repo...33.3eScholarship Repository and OAI-PMH (California Digital Library tenant)eScholarship is the University of California's open-access publishing platform and institutional repository...33.0Open Access Repository (Figshare tenancy)The university's Open Access institutional repository is a Figshare portal running on the institution's own...32.7OPARA OAI-PMH Harvesting InterfaceThe standards-based harvesting interface for OPARA — how TU Dresden's research data reaches OpenAIRE, BASE,...32.6OPARA Research Data Repository REST APIThe DSpace 7.6.2 REST API of OPARA, the open-access research-data repository ZIH operates for TU Dresden an...32.6Qucosa TU Dresden OAI-PMH (Institutional Document Server)The OAI-PMH 2.0 harvesting interface for the TU Dresden instance of Qucosa, the Saxon document and publicat...32.6OPEN FAU DSpace REST APIThe REST/HAL API of OPEN FAU, FAU's DSpace 7.4 institutional repository, run by the University Library on F...32.5OPEN FAU OAI-PMH Metadata ServiceOpen Archives Initiative Protocol for Metadata Harvesting 2.0 service for OPEN FAU, the university's open-a...32.5Vanderbilt Institutional Repository (VUIR)Self-hosted DSpace 9.1 institutional repository on Vanderbilt's own domain and infrastructure. The HAL REST...32.4Vanderbilt Institutional Repository OAI-PMHOAI-PMH 2.0 harvesting endpoint for the Vanderbilt Institutional Repository. Identify returns repositoryNam...32.4E-Dissertationen (ediss.sub.hamburg) OAI-PMHOAI-PMH 2.0 metadata-harvesting interface for the DSpace-based institutional repository of electronic disse...32.0Hamburg University Press OAI-PMHOAI-PMH 2.0 interface of Hamburg University Press, the open-access publishing house of the Staats- und Univ...32.0HUP Journal Server OAI-PMHOAI-PMH 2.0 interface of the journal server of Hamburg University Press. Verified live 2026-09-01: reposito...32.0Open-Access-Portal Universität HamburgOpen Access discovery portal aggregating freely available publications, research data, teaching materials a...32.0Archive ouverte UNIGE OAI-PMHOAI-PMH 2.0 metadata-harvesting interface for the Archive ouverte UNIGE institutional repository, exposing ...31.9Scholarworks@UAEU OAI-PMH Repository EndpointOAI-PMH 2.0 metadata harvesting endpoint for Scholarworks@UAEU, the university's open-access institutional ...31.7edoc DSpace REST APIPublic DSpace REST API for "edoc", the open-access institutional repository of the University of Basel, run...31.4edoc OAI-PMHOAI-PMH 2.0 metadata harvesting interface for edoc. Identify reports repositoryName "edoc: Open Access Repo...31.4Chula Digital Collections (bepress Digital Commons tenant)The university's open-access journals, theses and ETD platform, and the only working OAI-PMH endpoint in th...31.3Chula DigiVerse — Institutional Digital RepositoryThe university's digital preservation platform for theses, dissertations, rare books, multimedia and digiti...31.3Curtin Curate Research Repository (Figshare tenant)Curtin's institutional research repository, formerly espace on Ex Libris, now running on Figshare at curate...31.3Research Commons DSpace REST APIDSpace 7.6.5 REST API backing Research Commons, giving programmatic access to communities, collections, ite...31.1Research Commons OAI-PMHOAI-PMH 2.0 metadata harvesting interface for Research Commons, the university's open-access institutional ...31.1HAL — ENPC Open-Access Collection (tenant)ENPC's institutional open-access repository is the ENPC collection inside HAL, the French national open arc...30.3UKM Journal Article Repository (OAI-PMH) — unreachableEPrints repository of journal articles published by UKM faculties, institutes and UKM Press, registered in ...30.3Scholarly Publications OAI-PMHOAI-PMH 2.0 metadata harvesting endpoint for Leiden University Scholarly Publications, the Islandora-based ...30.2PubMed Central OA APIThe PMC Open Access API provides citation data, license information, and download links for Open Access art...30.1White Rose Research Online (OAI-PMH) — consortium tenancyRELATIONSHIP, NOT A CONTRACT. Leeds' scholarly publications repository is White Rose Research Online, a sha...30.1TUdatalib DSpace REST APIREST API of TUdatalib, the institutional research-data repository of TU Darmstadt. Verified live 2026-09-01...30.0TUjournals REST API (Janeway tenancy)TUjournals is TU Darmstadt's open-access journal platform, publisher of record "Universitaets- und Landesbi...30.0tuprints OAI-PMH (EPrints)tuprints is the open-access publication repository of TU Darmstadt, on the institution's own host and regis...30.0Repository@Nottingham DSpace REST APIKeyless, read-only HAL+JSON REST API of the university's self-hosted DSpace 8.2 / DSpace-CRIS (cris-2024.02...29.9Repository@Nottingham OAI-PMH (DSpace, institution-hosted)OAI-PMH 2.0 metadata-harvesting provider of the institution-hosted DSpace repository. Verified live 2026-08...29.9Repository@Nottingham OAI-PMH (Worktribe tenant)OAI-PMH 2.0 interface for the Worktribe-hosted Repository@Nottingham research-outputs showcase. Confirmed l...29.9Scholarship@Western OAI-PMH 2.0 provider (tenant)OAI-PMH 2.0 metadata harvesting for Western University's Open Repository. Identify returns repositoryName "...29.9Scholarship@Western on Scholaris — DSpace REST API (tenant)The HAL+JSON REST API of Western University's Open Repository, reachable anonymously at https://uwo.scholar...29.9Heriot-Watt Research Output Service (ROS)The university's own institutional repository of theses and research outputs, running DSpace 8 on www.ros.h...29.7Heriot-Watt Research Portal (Elsevier Pure)Heriot-Watt's public research information portal — publications, projects, research data, activities and re...29.7CaltechAUTHORS REST API and OAI-PMHCaltech's institutional publications repository, also on self-hosted InvenioRDM. Exposes the same REST reco...29.6DIAL.mem -- DSpace-CRIS REST APIDIAL.mem is UCLouvain's institutional repository for master's theses, part of the DIAL (Digital Access to L...29.5DIAL.mem OAI-PMHOAI-PMH 2.0 harvesting endpoint for DIAL.mem, UCLouvain's master's-thesis repository. Identify returns repo...29.5DIAL.pr (BOREAL) -- DSpace-CRIS REST APIDIAL.pr, branded BOREAL, is UCLouvain's institutional repository for the research publications of its profe...29.5DIAL.pr OAI-PMHOAI-PMH 2.0 harvesting endpoint for DIAL.pr, UCLouvain's research-publications repository. Identify returns...29.5OER-UCLouvain OAI-PMHOER-UCLouvain is the institution's open educational resources repository, running DSpace JSPUI on oer.uclou...29.5Waseda University Repository (OAI-PMH)OAI-PMH 2.0 metadata harvesting for the Waseda University Repository. The collection, the administrative co...29.5Enlighten Publications OAI-PMHOAI-PMH 2.0 metadata harvesting over Enlighten, the University of Glasgow's EPrints institutional repositor...29.3Enlighten Theses OAI-PMHOAI-PMH 2.0 metadata harvesting over Enlighten Theses, the University of Glasgow's electronic theses reposi...29.3Revistes UAB — Open Journal Systems (per-journal OAI-PMH 2.0)UAB self-hosts the journal platform on which its scholarly journals are published, and each journal exposes...29.3eDeposit Ireland — OAI-PMH and DSpace RESTIreland's national legal-deposit digital repository, administered by the Library of Trinity College Dublin ...29.2TARA OAI-PMH (Trinity's Access to Research Archive)TARA is Trinity's open-access institutional repository, a DSpace deployment on Trinity's own host (www.tara...29.2RITEC Institutional Repository — DSpace REST APIRITEC (repositorio.tec.mx) is the institution's DSpace 8.0 institutional repository, holding 86,310 discove...29.1RITEC Institutional Repository — OAI-PMH EndpointOAI-PMH 2.0 endpoint for RITEC, verified live on 2026-09-01. Identify returns repositoryName "Repositorio I...29.1Riviste Online SApienza (R.O.SA) OAI-PMHSite-wide OAI-PMH 2.0 provider over Riviste Online SApienza, the university's open-access journal publishin...29.1edoc-Server DSpace REST APIPublic, unauthenticated read API of the edoc-Server, the Open Access institutional repository of Humboldt-U...28.8edoc-Server OAI-PMH 2.0 InterfaceOAI-PMH 2.0 metadata harvesting endpoint for the edoc institutional repository, on HU's own host. ?verb=Ide...28.8GenderOpen Repositorium — HU DOI tenancyGenderOpen is the shared open-access repository for gender studies run jointly by the Freie Universität Ber...28.8ACM Digital Library Content Retrieval APIIndividual publications, conference papers, and journal articles in the ACM Digital Library are accessible ...28.4Open Research Exeter (ORE) - Figshare TenancyOpen Research Exeter is Exeter's institutional research repository and it is a Figshare tenancy, not instit...28.4Adelaide Research & Scholarship OAI-PMHOAI-PMH 2.0 metadata harvesting endpoint for the "Adelaide Research & Scholarship" repository, on the same ...28.3Adelaide Research & Scholarship REST APIDSpace 7.6.1 HAL/JSON REST API for the University of Adelaide institutional repository "Adelaide Research &...28.3Sydney eScholarship Repository (institutional repository, OAI-PMH)Sydney eScholarship is the university's own institutional repository, running on the university-owned usyd....28.0ScholarBank@NUS DSpace REST APIThe HAL-style REST API of ScholarBank@NUS, the university's institutional repository — communities, collect...27.9ScholarBank@NUS OAI-PMH InterfaceOAI-PMH 2.0 metadata harvesting endpoint for ScholarBank@NUS, advertising twelve metadata formats including...27.9HAL Search API — SORBONNE-UNIVERSITE collectionThe HAL Solr search API scoped to Sorbonne University's collection at https://api.archives-ouvertes.fr/sear...27.7HAL Sorbonne Universite Open Archive — OAI-PMH (Sorbonne scope)Sorbonne University's open archive of scholarly publications, harvestable over OAI-PMH 2.0 at the Sorbonne-...27.7Research Online (Figshare tenancy)Research Online is UOW's open access institutional repository, and since its 2025 platform migration it is ...27.7St Andrews Research Repository OAI-PMHOAI-PMH 2.0 endpoint for the DSpace-based St Andrews Research Repository, the University's open-access repo...27.7University of Sussex Research Data Repository (Figshare tenant)Sussex's institutional research repository, a Figshare tenant at sussex.figshare.com (CNAME to figshare.com...27.4QSpace Institutional Repository (Open Repository tenant)QSpace is Qatar University's institutional repository — 66,950 records, DSpace 7.6, administered by Qatar U...27.3VU Research Portal OAI-PMHOAI-PMH 2.0 metadata harvesting interface for the Vrije Universiteit Amsterdam Repository, served from the ...27.2ZORA DSpace REST APIZORA runs DSpace 8.0 and exposes the standard DSpace REST API (application/hal+json) for programmatic disco...27.2ZORA Repository OAI-PMHThe Zurich Open Repository and Archive (ZORA) is UZH's institutional repository for the peer-reviewed resea...27.2Bern Open Publishing (BOP Serials) OAI-PMH EndpointOAI-PMH 2.0 endpoint for Bern Open Publishing, the University Library's diamond open-access journal platfor...27.1BORIS Portal OAI-PMH EndpointOAI-PMH 2.0 metadata-harvesting endpoint for BORIS Portal, the University of Bern's institutional repositor...27.1OpenBU Repository — OAI-PMH and DSpace REST (Atmire-operated)OpenBU is Boston University Libraries' open-access institutional repository. The content, the collections a...27.1Docta Complutense Repository API (DSpace 7)Docta Complutense is UCM's open-access institutional repository, migrated in 2023 to DSpace 7 and self-host...27.0Scholarly Commons @ CWRU — OAI-PMH 2.0 providerAn open OAI-PMH 2.0 metadata provider on CWRU's own host. Identify reports repositoryName "Scholarly Common...27.0IRIS UNIPD OAI-PMHOAI-PMH 2.0 harvesting endpoint for IRIS UNIPD, the University of Padua's institutional research catalogue ...26.7Padua Theses and Dissertations OAI-PMHOAI-PMH 2.0 harvesting endpoint for the University of Padua theses and dissertations archive. Live and anon...26.7Research Data Unipd OAI-PMHOAI-PMH 2.0 harvesting endpoint for Research Data Unipd, the EPrints-based research-data archive of the Uni...26.7Knowledge Bank DSpace REST APIREST API for the Knowledge Bank, Ohio State University Libraries' DSpace 7.6 institutional repository. Expo...26.6Knowledge Bank OAI-PMH InterfaceOAI-PMH 2.0 metadata harvesting endpoint for the Knowledge Bank institutional repository, supporting the st...26.6Aarhus University OAI-PMH Metadata ServiceOpen Archives Initiative Protocol for Metadata Harvesting 2.0 service for Aarhus University's research reco...26.5Queen Mary Research Online (QMRO) — DSpace 8.4 REST APIQueen Mary's open-access institutional repository runs DSpace 8.4 and exposes the standard DSpace REST API ...26.5UPF Digital Repository OAI-PMH EndpointOAI-PMH 2.0 metadata harvesting endpoint for e-Repositori, on UPF's own host. Probed 2026-09-01: verb=Ident...26.4UPF Digital Repository REST API (DSpace 7)e-Repositori (Repositori digital de la UPF) is UPF's open-access institutional repository, self-hosted on U...26.4UTM Institutional Repository (UTM-IR) EPrints OAI-PMH — unreachableThe older EPrints institutional repository, registered with ROAR (record 1358), OpenDOAR and Sherpa (record...26.3UTM Press Journals (Open Journal Systems) — OAI-PMHPenerbit UTM Press runs the university's journal estate on PKP Open Journal Systems at journals.utm.my (161...26.3UTMIK Repository (DSpace-CRIS) — OAI-PMH and RESTUTM's institutional knowledge repository, running DSpace-CRIS on utmik.utm.my (161.139.22.165, inside UTM's...26.3HAL OAI-PMH — ens-lyon collectionOAI-PMH 2.0 harvesting endpoint scoped to ENS de Lyon's named collection on HAL, the French national open a...26.2HAL Search API — ens-lyon collectionHAL's Solr-backed search API scoped to the ENS de Lyon collection. A probe of /search/ens-lyon/?q=*:*&wt=js...26.2NTNU Open Access Journals OAI-PMHNTNU runs its own Open Journal Systems installation, "NTNU Open Access Journals", on its own registrable do...26.2NVA National Research Archive (NTNU Open successor)Nasjonalt vitenarkiv (NVA) is the Sikt-operated national open research archive that absorbed NTNU's institu...26.2
Emerging 44 Early or largely undocumented
ERA — Education and Research Archive (on Scholaris)ERA is the University of Alberta's institutional repository. It was the library's own Samvera/Hyrax applica...26.1OUR Archive OAI-PMH Metadata — Ex Libris Esploro tenancyOUR Archive (Otago University Research Archive) is the University's institutional research repository. The ...25.8AUB ScholarWorks DSpace REST APIAnonymous HAL/JSON REST API for AUB ScholarWorks, AUB's institutional repository, running DSpace 9.1 on AUB...25.7AUB ScholarWorks OAI-PMHOAI-PMH 2.0 metadata harvesting endpoint for AUB ScholarWorks. Identify returns repositoryName "AUB Scholar...25.7Loughborough University Library Catalogue API (Koha)The REST API of Loughborough University Library's Koha integrated library system, served from the universit...25.4Loughborough University Research Repository (figshare tenancy)The Loughborough Research Repository is the university's institutional repository for all research outputs,...25.4UCL Discovery — OAI-PMHUCL Discovery is UCL's open-access institutional repository of research outputs, running EPrints on UCL's o...25.1AURA DSpace REST API (tenancy on Edinburgh IS infrastructure)The Aberdeen University Research Archive (AURA) runs DSpace 8.1-SNAPSHOT and exposes a public HATEOAS REST ...25.0AURA OAI-PMH Metadata Harvesting (tenancy on Edinburgh IS infrastructure)AURA's OAI-PMH 2.0 endpoint, repositoryName "Aura", repositoryIdentifier aura.abdn.ac.uk, adminEmail aura-m...25.0Elsevier Pure CRIS tenancy (research portal, REST + OAI-PMH)The University's tenancy of Elsevier Pure, its current research information system, published as "The Unive...25.0AlmaDL Journals OAI-PMHSite-wide OAI-PMH 2.0 provider over AlmaDL Journals, the university's open-access journal publishing platfo...24.7AMS Acta Institutional Repository OAI-PMHOAI-PMH 2.0 metadata-harvesting provider for AMS Acta, the AlmaDL institutional research repository, self-h...24.7AMS Tesi di Dottorato (Doctoral Theses) OAI-PMHSecond, distinct OAI-PMH 2.0 provider run by AlmaDL over AMS Tesi di Dottorato, the university's doctoral t...24.7AMS Tesi di Laurea (Graduate Theses) OAI-PMHThird AlmaDL OAI-PMH 2.0 provider, over AMS Tesi di Laurea, the university's graduate and undergraduate the...24.7IIT Delhi Institutional Repository DSpace REST APIThe IIT Delhi Central Library institutional repository runs on DSpace 8.0 and exposes the standard DSpace R...24.6IIT Delhi Institutional Repository OAI-PMHOAI-PMH 2.0 metadata-harvesting interface for the IIT Delhi DSpace 8 institutional repository, on the insti...24.6jMorp GraphQL API (Tohoku Medical Megabank Organization)Public, anonymous, read-only GraphQL API for jMorp — the Japanese Multi Omics Reference Panel published by ...24.6King Abdulaziz University Journals (Digital Commons tenancy)KAU's Scientific Publishing Centre journals delivered on Elsevier's Digital Commons (bepress) platform, wit...24.6TOUR Institutional Repository OAI-PMHOAI-PMH 2.0 metadata harvesting endpoint for TOUR (TOhoku University Repository). The collection, the depar...24.6Biblos-e Archivo OAI-PMH EndpointOAI-PMH 2.0 metadata-harvesting endpoint for Biblos-e Archivo. Identify returns repositoryName "Biblos-e Ar...24.1Biblos-e Archivo REST API (DSpace 7)HAL-based REST API for Biblos-e Archivo, UAM's institutional repository, running DSpace 7.6.5. Anonymously ...24.1Portal de Revistas Electrónicas de la UAM — OAI-PMH EndpointOAI-PMH 2.0 endpoint over the university's Open Journal Systems 3.3.0.6 installation, which hosts UAM's ele...24.1DADUN Institutional Repository (OAI-PMH)DADUN (Deposito Academico Digital de la Universidad de Navarra) is the university's open-access institution...23.1USC Figshare Research Repository (Tenant)USC Libraries offers Figshare to USC researchers as its data-output repository for datasets, posters and pr...23.1TU/e Research Portal OAI-PMHLive OAI-PMH 2.0 harvesting interface for the TU/e Research Portal, served by Elsevier Pure at TU/e's own p...22.8Crossref membership — Edicions de la Universitat de Barcelona (member 17854)The University of Barcelona press is a Crossref member in its own right: member id 17854, DOI prefixes 10.1...22.6Revistes Científiques de la UB (OJS) — OAI-PMH 2.0Open Journal Systems platform self-hosted by UB at revistes.ub.edu, publishing the university's scholarly j...22.6UI Scholars Hub OAI-PMH (bepress Digital Commons tenant)OAI-PMH 2.0 metadata-harvesting interface for UI Scholars Hub, the university's institutional research repo...22.6Canterbury Figshare Research Data Repository (tenant)canterbury.figshare.com is the University of Canterbury's institutional research data repository, a tenancy...22.4UC Research Repository OAI-PMHOAI-PMH 2.0 metadata harvesting interface for the UC Research Repository, a self-hosted DSpace 7 institutio...22.4HAL-ENS Open Archive — ENS-PARIS collectionENS research output is deposited into the ENS-PARIS collection of HAL, the French national open archive ope...22.2Repositorio Académico DSpace REST APIThe DSpace 6 REST API on the University of Chile institutional repository, not catalogued before this run. ...22.1Repositorio Académico OAI-PMHOAI-PMH 2.0 provider on the University of Chile institutional repository (Repositorio Académico), managed b...22.1DiVA Institutional Repository (OAI-PMH)Stockholm University's publication records are harvestable over OAI-PMH 2.0 from its DiVA instance at su.di...21.7Stockholm University Research Data Repository (Figshare tenancy)su.figshare.com is Stockholm University's research data repository, running on Figshare. The data, the DOIs...21.7HUSCAP XML SitemapsPublicly crawlable XML sitemap index for HUSCAP, the Hokkaido University Collection of Scholarly and Academ...21.5JaLC DOI Prefix 10.14943Hokkaido University registers DOIs through JaLC, the Japan Link Center, under prefix 10.14943. Confirmed fr...21.5Queen's University Belfast Research Portal — DataCite repository clientQueen's University Belfast is a DataCite consortium organization (provider jxtg) and has operated a registe...20.5Queen's University Belfast Research Portal — OAI-PMH harvesting endpointLive OAI-PMH 2.0 metadata harvesting endpoint for the QUB Research Portal. Identify returns repositoryName ...20.5Bridges — Monash Research Repository (Figshare tenant)Monash's institutional research data repository, "Bridges", operating on the Figshare platform. bridges.mon...19.8CityUHK Scholars OAI-PMHPublic OAI-PMH 2.0 endpoint for CityUHK Scholars, the university's research information system and institut...19.7Open Research Newcastle (Figshare) — TENANTThe university's open-access institutional repository and research-data store, running on the Figshare plat...18.3OPAL (Open @ La Trobe) Research RepositoryOPAL is La Trobe's open-access research repository — its publications, theses, datasets and DOIs — deployed...17.4RMIT Research Repository (Esploro)The RMIT Research Repository is RMIT University's open access research portal, powered by Clarivate's Esplo...17.4
Minimal 8 Almost no public developer surface
GeoCat bv OGC API - FeaturesA modern OGC API - Features endpoint alongside the classic OGC web services. Verified anonymously on 2026-0...5.3GeoCat bv OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...5.3GeoSolutions OGC API - FeaturesA modern OGC API - Features endpoint alongside the classic OGC web services. Verified anonymously on 2026-0...5.3GeoSolutions OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...5.3Deutscher Wetterdienst OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...3.4Eurac Research OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...3.4Flanders Marine Institute OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...3.4Spacebel s.a OGC Web Services (WMS / WFS)OGC-standard web services served from a GeoServer instance. Verified anonymously on 2026-08-20: a WMS 1.3.0...3.4

Companies reaching this through an API (55)

These companies publish an API, specification or operation carrying “Open Access” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Aalto University California Institute of Technology Canonical Cardiff University Case Western Reserve University City University of Hong Kong Columbia University Complutense University of Madrid Eindhoven University of Technology Emory University ExchangeRate-API Harvard University IEEE Xplore Indian Institute of Technology Bombay Johns Hopkins University King Abdulaziz University KU Leuven McGill University Monash University National Institutes of Health (NIH) PJM Interconnection Politecnico di Torino PubMed Tecnológico de Monterrey UCLouvain United Arab Emirates University Universitat Pompeu Fabra University of Adelaide University of Alberta University of Auckland University of Bonn University of California, Berkeley University of California, Davis University of California, San Francisco University of California, Santa Barbara University of Cape Town University of Exeter University of Geneva University of Gothenburg University of Helsinki University of Indonesia University of Leeds University of Manchester University of Minnesota University of Newcastle Australia University of Pennsylvania University of Southern California University of Sydney University of Texas at Austin University of Warsaw
Show all 55 companies ↓
University of Washington University of Waterloo University of Wisconsin-Madison Vanderbilt University Washington University in St. Louis

Score breakdown

Frequency
69.0
log-scaled weighted occurrences
Breadth
3.6
spread across providers
Quality lift
38.3
mean composite of providers using it
Cohesion
68.3
strength of nearest seed neighbor

Related tags

OAI-PMH 152 co-occurrences University 159 co-occurrences Research Data 129 co-occurrences SAML 145 co-occurrences Shibboleth 118 co-occurrences Identity Federation 152 co-occurrences Higher Education 160 co-occurrences Research Repository 110 co-occurrences

Where this tag comes from

Api tag231
Provider tag137
Openapi tag2
Openapi op tag3

Cohort brief

Auto-generated

The 137 providers in the APIs.io catalog tagged Open Access, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
137
all scored
Mean Kin Score
31.1
+8.2 vs catalog 22.9
Mean Agent Readiness
16
+4.1 vs catalog 11.9
Spread
3.4–57.3
median 31.1 · σ 10.6
How the 137 split by band
Exemplar 0Strong 1Developing 27Thin 76Emerging 24Minimal 9
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 28.3 17.6 +10.7 137
Access Clarity 36.9 26.5 +10.4 137
Discoverability 66.1 58.1 +8 137
Operational Transparency 20.3 13.7 +6.6 137
Contract Governance 12 6.3 +5.7 137
Developer Ergonomics 25.5 23.2 +2.3 137

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 2% 14% -12
MCP server (first-party) 2% 12% -10
Agent Skills 0% 0% 0
OAuth scopes 22% 11% +11
Security 96% 98% -2
Arazzo workflows 0% 2% -2
Governance rules 39% 14% +25

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Delft University of Technology 57.3
  2. 2 University of Cambridge 50
  3. 3 Uppsala University 49.4
  4. 4 Dryad 49
  5. 5 arXiv 48.1
  6. 6 Australian National University 47.9
  7. 7 TU Wien 47.1
  8. 8 Zenodo 47.1
  9. 9 RWTH Aachen University 45.9
  10. 10 Pennsylvania State University 45.8
Top by Agent Readiness
  1. 1 DeSci Labs 53
  2. 2 Queensland University of Technology 34.7
  3. 3 Semantic Scholar 34.2
  4. 4 Massey University 33.3
  5. 5 Figshare 33.1
  6. 6 Smithsonian Institution 32.5
  7. 7 Unpaywall 32.5
  8. 8 University of Calgary 32.4
  9. 9 Carnegie Mellon University 32.1
  10. 10 University of Waikato 31.3
All 137 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 5 October 2026, across 29093 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/open-access"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/open-access"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/open-access/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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