Leiden University (Universiteit Leiden), founded 1575, is the oldest university in the Netherlands and a founding member of LERU. It operates a federation of bought systems, not a developer program: it publishes no public REST API and no developer portal, api.universiteitleiden.nl, api.leidenuniv.nl, developer.universiteitleiden.nl and data.universiteitleiden.nl do not resolve, and neither of its GitHub organisations holds a single OpenAPI or Swagger file. What it does operate, on its own infrastructure, are three verified machine-readable surfaces: an OAI-PMH 2.0 endpoint for the Scholarly Publications repository, a signed SAML 2.0 identity-provider metadata document registered in the SURFconext national federation, and a PGP-signed RFC 9116 security.txt. Everything else that looks programmable belongs to a vendor Leiden buys from — Ex Libris Primo, D2L Brightspace, SURF Yoda — and is recorded below as a tenancy, never as Leiden's engineering.
Leiden University publishes 9 APIs on the APIs.io network. Tagged areas include University, Higher Education, Education, Netherlands, and LERU.
The Leiden University catalog on APIs.io includes 1 JSON-LD context.
Regulatory Posture applies to this provider. Its tags matched the
Education & Research regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/leiden: open an issue to ask a question, or submit a pull request to add artifacts.
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Leiden University's own SAML 2.0 identity-provider metadata document, authored and XML-DSig signed by Leiden and served as text/xml from login.uaccess.leidenuniv.nl. Asserts the...
Leiden University's IDPSSODescriptor is published in the SURFconext national identity federation aggregate operated by SURF B.V., carrying mdui:DisplayName "Leiden University" a...
Leiden University is a DataCite consortium_organization with symbol VIOJ, organizationType academicInstitution, country NL, and rorId https://ror.org/027bh9e22, registered 2023-...
Leiden University Press, Leiden University's own academic press, is Crossref member 22598 with 2,588 registered DOIs. A registry membership and a fact about the institution; the...
Leiden University is registered in the Research Organization Registry as https://ror.org/027bh9e22, domain leidenuniv.nl. A registry entry about the institution; the ROR API con...
Leiden University's research data management portal runs as an institution-specific tenancy of Yoda/iRODS hosted by SURF at leiden-yoda.irods.surfsara.nl. The tenancy is real an...
Leiden's learning management system is a D2L Brightspace tenancy on Leiden's own hostname, brightspace.universiteitleiden.nl, authenticating through SURFconext. Its D2L Valence ...
Leiden University Libraries' discovery catalogue at catalogue.leidenuniv.nl CNAMEs to leiden.primo.exlibrisgroup.com and serves Ex Libris Primo VE with view id 31UKB_LEU:UBL_NDE...
aid: leiden
name: Leiden University
x-type: university
x-category: Public Research University
description: 'Leiden University (Universiteit Leiden), founded 1575, is the oldest university in the Netherlands and a founding
member of LERU. It operates a federation of bought systems, not a developer program: it publishes no public REST API and
no developer portal, api.universiteitleiden.nl, api.leidenuniv.nl, developer.universiteitleiden.nl and data.universiteitleiden.nl
do not resolve, and neither of its GitHub organisations holds a single OpenAPI or Swagger file. What it does operate, on
its own infrastructure, are three verified machine-readable surfaces: an OAI-PMH 2.0 endpoint for the Scholarly Publications
repository, a signed SAML 2.0 identity-provider metadata document registered in the SURFconext national federation, and
a PGP-signed RFC 9116 security.txt. Everything else that looks programmable belongs to a vendor Leiden buys from — Ex Libris
Primo, D2L Brightspace, SURF Yoda — and is recorded below as a tenancy, never as Leiden''s engineering.'
type: Index
deliveryModel:
model: saas
open_source: false
commercial: false
callable_host: true
label: Institution-operated endpoints · no commercial API program
confidence: medium
source:
- probed
generated: '2026-09-01'
method: derived
accessModel:
pricing: free
onboarding: none
trial: false
try_now: true
public: true
label: Free · anonymous metadata harvesting
confidence: high
source:
- probed
generated: '2026-09-01'
method: derived
position: Producing
access: 1st-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
url: https://raw.githubusercontent.com/api-evangelist/leiden/refs/heads/main/apis.yml
tags:
- University
- Higher Education
- Education
- Netherlands
- LERU
- Research
- Research Repository
- Open Access
- OAI-PMH
- Identity Federation
- Library
- Research Data Management
created: '2026-06-03'
modified: '2026-09-01'
specificationVersion: '0.23'
apis:
- aid: leiden:scholarly-oai
name: Scholarly Publications OAI-PMH
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: institution
description: 'OAI-PMH 2.0 metadata harvesting endpoint for Leiden University Scholarly Publications, the Islandora-based
institutional repository holding PhD theses, articles, journals, book series and conference proceedings. Verified live:
Identify returns repositoryName "Leiden University Scholary Publications" and adminEmail beheer@library.leidenuniv.nl;
ListMetadataFormats advertises mods, nl_didl, oai_dc, oai_etdms and oai_openaire; ListSets returns Dissertations, E-depot,
Leiden University Press, Scholarly Repository and open_access. The host resolves through p-lb-019369.infra.leidenuniv.nl
to Leiden''s own network — this is Leiden''s endpoint, running open-source software Leiden itself hosts, not a vendor
SaaS tenancy.'
humanURL: https://scholarlypublications.universiteitleiden.nl/about
baseURL: https://scholarlypublications.universiteitleiden.nl/oai2
tags:
- OAI-PMH
- Open Access
- Repository
- Metadata
- Library
- Islandora
properties:
- type: Documentation
url: https://scholarlypublications.universiteitleiden.nl/about
- type: Conformance
url: conformance/leiden-domain-standards.yml
- aid: leiden:saml-idp
name: Leiden University SAML 2.0 Identity Provider Metadata
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: institution
description: Leiden University's own SAML 2.0 identity-provider metadata document, authored and XML-DSig signed by Leiden
and served as text/xml from login.uaccess.leidenuniv.nl. Asserts the scopes leidenuniv.nl and umail.leidenuniv.nl. This
is the machine-readable contract every service Leiden federates with consumes, and it is entirely institution-operated.
humanURL: https://www.universiteitleiden.nl/en/about-us
baseURL: https://login.uaccess.leidenuniv.nl/nidp/saml2/metadata
tags:
- SAML
- Identity Federation
- SSO
- Metadata
properties:
- type: Authentication
url: authentication/leiden-identity-federation.yml
- type: Conformance
url: conformance/leiden-domain-standards.yml
- aid: leiden:surfconext
name: SURFconext Federation Membership
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: federation
description: Leiden University's IDPSSODescriptor is published in the SURFconext national identity federation aggregate
operated by SURF B.V., carrying mdui:DisplayName "Leiden University" and shibmd:Scope leidenuniv.nl. A federation is shared
by definition; the entity inside it is Leiden's. The federation is operationally live — an anonymous request to Leiden's
Brightspace tenancy redirects to engine.surfconext.nl with a SAMLRequest. SURFconext's own contract is SURF's and is not
saved here.
humanURL: https://wiki.surfnet.nl/display/surfconext/
baseURL: https://metadata.surfconext.nl/idps-metadata.xml
tags:
- Identity Federation
- SAML
- eduGAIN
- SURF
- Netherlands
properties:
- type: Authentication
url: authentication/leiden-identity-federation.yml
- aid: leiden:datacite
name: DataCite Consortium Membership (VIOJ)
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: registry
description: Leiden University is a DataCite consortium_organization with symbol VIOJ, organizationType academicInstitution,
country NL, and rorId https://ror.org/027bh9e22, registered 2023-02-08. Two repositories are registered under it — vioj.dxnjnk
"Leiden Repository" (scholarlypublications.universiteitleiden.nl) and vioj.mcaazz "Yoda Portal Leiden University". This
is a registry Leiden is registered in; the DataCite REST API contract is DataCite's and is not saved here. The DataCite
Commons human page (commons.datacite.org/providers/vioj) answers our probes with HTTP 429 and is therefore not emitted
as a pointer.
humanURL: https://api.datacite.org/providers/vioj
baseURL: https://api.datacite.org/providers/vioj
tags:
- DataCite
- DOI
- Registry
- Persistent Identifiers
- Research Data
properties:
- type: Conformance
url: conformance/leiden-domain-standards.yml
- aid: leiden:crossref
name: Crossref Membership — Leiden University Press
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: registry
description: Leiden University Press, Leiden University's own academic press, is Crossref member 22598 with 2,588 registered
DOIs. A registry membership and a fact about the institution; the Crossref REST API contract is Crossref's and is not
saved here.
humanURL: https://www.crossref.org/members/prep/22598
baseURL: https://api.crossref.org/members/22598
tags:
- Crossref
- DOI
- Registry
- Scholarly Publishing
- University Press
properties:
- type: Conformance
url: conformance/leiden-domain-standards.yml
- aid: leiden:ror
name: ROR Registration
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: registry
description: Leiden University is registered in the Research Organization Registry as https://ror.org/027bh9e22, domain
leidenuniv.nl. A registry entry about the institution; the ROR API contract is ROR's and is not saved here.
humanURL: https://ror.org/027bh9e22
baseURL: https://api.ror.org/organizations/027bh9e22
tags:
- ROR
- Registry
- Persistent Identifiers
- Research
properties:
- type: Documentation
url: https://ror.org/027bh9e22
- aid: leiden:yoda
name: Yoda Research Data Management Portal (Leiden tenancy)
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: tenant
description: Leiden University's research data management portal runs as an institution-specific tenancy of Yoda/iRODS hosted
by SURF at leiden-yoda.irods.surfsara.nl. The tenancy is real and is Leiden's — it is registered with DataCite as repository
vioj.mcaazz "Yoda Portal Leiden University" — but the platform and its API contract are Yoda's and SURF's, not Leiden's
engineering, so no contract is saved under this slug.
humanURL: https://leiden-yoda.irods.surfsara.nl/
baseURL: https://leiden-yoda.irods.surfsara.nl/
tags:
- Research Data Management
- Yoda
- iRODS
- SURF
- Tenant
properties:
- type: Documentation
url: https://utrechtuniversity.github.io/yoda/
- aid: leiden:brightspace
name: D2L Brightspace LMS (Leiden tenancy)
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: tenant
description: Leiden's learning management system is a D2L Brightspace tenancy on Leiden's own hostname, brightspace.universiteitleiden.nl,
authenticating through SURFconext. Its D2L Valence API version manifest is readable anonymously at /d2l/api/versions/
and returns the product/version matrix (bas, ep, le, lp and others). That contract is D2L's, shared by every Brightspace
customer, and is deliberately not saved here — only the tenancy is recorded.
humanURL: https://brightspace.universiteitleiden.nl/
baseURL: https://brightspace.universiteitleiden.nl/d2l/api/versions/
tags:
- LMS
- Brightspace
- D2L
- Learning
- Tenant
properties:
- type: Documentation
url: https://docs.valence.desire2learn.com/
- aid: leiden:primo
name: Library Discovery Catalogue (Ex Libris Primo VE tenancy)
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leiden.png
x-operator: tenant
description: Leiden University Libraries' discovery catalogue at catalogue.leidenuniv.nl CNAMEs to leiden.primo.exlibrisgroup.com
and serves Ex Libris Primo VE with view id 31UKB_LEU:UBL_NDE. The institution-specific hostname makes this Leiden's tenancy;
the discovery platform and any API over it are Ex Libris Group's, so no contract is saved under this slug.
humanURL: https://catalogue.leidenuniv.nl/
baseURL: https://catalogue.leidenuniv.nl/nde/search?vid=31UKB_LEU%3AUBL_NDE
tags:
- Library
- Discovery
- Primo
- Ex Libris
- Tenant
properties:
- type: Documentation
url: https://www.library.universiteitleiden.nl/
common:
- type: Website
url: https://www.universiteitleiden.nl/en
- type: Website
url: https://www.leidenuniv.nl/
- type: SecurityTxt
url: https://www.universiteitleiden.nl/.well-known/security.txt
- type: VulnerabilityDisclosure
url: https://www.staff.universiteitleiden.nl/binaries/content/assets/ul2staff/ict/responsible-disclosure-eng.pdf
- type: PrivacyPolicy
url: https://www.organisatiegids.universiteitleiden.nl/en/regulations/general/privacy-statements
- type: TermsOfService
url: https://www.organisatiegids.universiteitleiden.nl/en/regulations/general/university-website-disclaimer
- type: IdentityFederation
url: authentication/leiden-identity-federation.yml
- type: ResearchRepository
url: https://scholarlypublications.universiteitleiden.nl/
- type: LibraryCatalog
url: https://catalogue.leidenuniv.nl/
- type: CourseCatalog
url: https://studiegids.universiteitleiden.nl/
- type: OpenData
url: https://home.strw.leidenuniv.nl/~moldata/
- type: GitHubOrganization
url: https://github.com/LeidenUniversityLibrary
- type: GitHubOrganization
url: https://github.com/CWTSLeiden
- type: LinkedIn
url: https://www.linkedin.com/school/leiden-university/
- type: DomainSecurity
url: security/leiden-domain-security.yml
- type: Plans
url: plans/leiden-plans-pricing.yml
- type: RateLimits
url: rate-limits/leiden-rate-limits.yml
- type: FinOps
url: finops/leiden-finops.yml
- type: Review
url: review.yml
x-coverage:
state: covered
reason: no_public_api
detail: 'Leiden University operates no public REST API and no developer program — api.universiteitleiden.nl, api.leidenuniv.nl,
developer.universiteitleiden.nl, developers.universiteitleiden.nl, data.universiteitleiden.nl and opendata.universiteitleiden.nl
all return NXDOMAIN, /llms.txt is a real 404, and GitHub code search across both LeidenUniversityLibrary (110 repos) and
CWTSLeiden (13 repos) returns zero files named openapi or swagger. The profile is nonetheless fully covered: three institution-operated
machine-readable surfaces were verified live (an OAI-PMH 2.0 endpoint on Leiden''s own infrastructure, a signed SAML 2.0
IdP metadata document, and a PGP-signed RFC 9116 security.txt), alongside three vendor tenancies (Ex Libris Primo, D2L
Brightspace, SURF Yoda) and three registry memberships (DataCite VIOJ, Crossref 22598, ROR 027bh9e22). Note for future
runs: the universiteitleiden.nl estate answers header-poor clients with HTTP 200 and a "Toegang geblokkeerd / Access Blocked"
body, which reads as a soft-404 — a full browser header set is required and then 404s are honest.'
evidence:
- url: https://scholarlypublications.universiteitleiden.nl/oai2?verb=Identify
status: 200
- url: https://login.uaccess.leidenuniv.nl/nidp/saml2/metadata
status: 200
- url: https://www.universiteitleiden.nl/.well-known/security.txt
status: 200
- url: https://metadata.surfconext.nl/idps-metadata.xml
status: 200
- url: https://api.datacite.org/providers/vioj
status: 200
- url: https://brightspace.universiteitleiden.nl/d2l/api/versions/
status: 200
- url: https://www.universiteitleiden.nl/llms.txt
status: 404
- url: https://api.universiteitleiden.nl/
status: 0
- url: https://data.universiteitleiden.nl/
status: 0
checked: '2026-09-01'
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
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