Library
LibrariesLibrary
Providers using this tag (180)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 1 Solid coverage with minor gaps
Developing 27 Usable, with meaningful gaps to close
Thin 73 Limited public surface area
Emerging 71 Early or largely undocumented
Minimal 8 Almost no public developer surface
APIs with this tag (411)
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 4 Complete, well-documented, and agent-ready
Strong 66 Solid coverage with minor gaps
Developing 66 Usable, with meaningful gaps to close
Thin 131 Limited public surface area
Emerging 140 Early or largely undocumented
Minimal 4 Almost no public developer surface
Companies reaching this through an API (109)
These companies publish an API, specification or operation carrying “Library” 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.
Show all 109 companies ↓
Score breakdown
Related tags
Where this tag comes from
Markets provisional
Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.
| Market | Share of the market's providers |
|---|---|
| IIIF and Cultural Heritage (GLAM image interoperability, Linked Art) | 53% |
| Higher Education and Research | 29% |
| Book Publishing (ONIX / ISBN / EPUB supply chain) | 24% |
Cohort brief
Auto-generatedThe 179 providers in the APIs.io catalog tagged Library, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 32.8 | 17.2 | +15.6 | 179 |
| Discoverability | 64.3 | 57.9 | +6.4 | 179 |
| Developer Ergonomics | 29.6 | 23.2 | +6.4 | 179 |
| Contract Governance | 11.1 | 6.5 | +4.6 | 179 |
| Operational Transparency | 14 | 13 | +1 | 179 |
| Access Clarity | 20.9 | 23.9 | -3 | 179 |
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.
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 1% | 13% | -12 |
| MCP server (first-party) | 1% | 12% | -11 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 25% | 11% | +14 |
| Security | 99% | 98% | +1 |
| Arazzo workflows | 0% | 2% | -2 |
| Governance rules | 49% | 16% | +33 |
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.
- 1 FOLIO 57.6
- 2 University of Macau 50.8
- 3 Trove 50.1
- 4 University of Helsinki 49.2
- 5 Wageningen University & Research 46.2
- 6 Pennsylvania State University 46.1
- 7 University of British Columbia 45.9
- 8 Stanford University 44.8
- 9 University of Cambridge 43.9
- 10 University of California, Davis 43.6
- 1 Trove 45.1
- 2 Rice University 44.8
- 3 Columbia University 41
- 4 EBSCO 36.4
- 5 University of Melbourne 36.1
- 6 FOLIO 35.8
- 7 Koha 35
- 8 WorldCat 34.6
- 9 Hong Kong University of Science and Technology 33.6
- 10 Unpaywall 33.1
Coverage caveat. 136 of 179 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 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.