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 →

Developing 1 Usable, with meaningful gaps to close

UK Open Banking Open Data APIPublic-facing APIs enabling third-party developers to access standardized open data published by Account Se...42.7

Thin 1 Limited public surface area

ApivaultApivault is a free, open-source API directory that serves as a gateway to a world of public APIs. It catalo...31.9

Companies reaching this through an API (1)

These companies publish an API, specification or operation carrying “Public APIs” 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.

UK Open Banking

Score breakdown

Frequency

73.2

log-scaled weighted occurrences

Breadth

7.5

spread across providers

Quality lift

15.5

mean composite of providers using it

Cohesion

40.2

strength of nearest seed neighbor

Where this tag comes from

Provider tag1196

Api tag2

Cohort brief

Auto-generated

The 1036 providers in the APIs.io catalog tagged Public APIs, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

1036

all scored

Mean Kin Score

10.6

-13.3 vs catalog 23.9

Mean Agent Readiness

-9 vs catalog 12

Spread

3.9–74.6

median 7.6 · σ 11.6

How the 1036 split by band

Exemplar 6Strong 19Developing 38Thin 22Emerging 24Minimal 927

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Discoverability	58.9	61.2	-2.3	1036
Contract Governance	2.4	6.4	-4	1036
Operational Transparency	2.8	13.9	-11.1	1036
Developer Ergonomics	10.6	23.4	-12.8	1036
Contract Quality	5.1	19.8	-14.7	1036
Access Clarity	4.2	26.5	-22.3	1036

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

Artifact	This cohort	Catalog	Difference
MCP server (any)	1%	10%	-9
MCP server (first-party)	4%	13%	-9
Agent Skills	0%	0%	0
OAuth scopes	1%	11%	-10
Security	100%	96%	+4
Arazzo workflows	1%	2%	-1
Governance rules	9%	14%	-5

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 OpenSanctions 74.6
2 Kraken 74.5
3 Mailboxlayer 71.9
4 Polygon 68.3
5 IPinfo 67.5
6 Shodan 67.2
7 OpenWeatherMap 64.9
8 positionstack 64.2
9 Last.fm 62.6
10 Mediastack 61.4

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/public-apis"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/public-apis"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/public-apis/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Public APIs

Providers using this tag (1187)

APIs with this tag (2)