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 2 Complete, well-documented, and agent-ready

ControlUp Public APIThe Public API API from ControlUp — 11 operation(s) for public api.75.6 Plunk Public APIPublic API endpoints for sending emails and tracking events73.6

Strong 4 Solid coverage with minor gaps

Postiz Public APIThe Public API API from Postiz — 22 operation(s) for public api.64.9 Fama Public APIendpoints intended for direct use62.5 Facets Public APIs APIThe public-ap-is API from Facets — 20 operation(s) for public-ap-is.60.5 EventX Public APIThe Public Api API from EventX — 5 operation(s) for public api.56.1

Developing 9 Usable, with meaningful gaps to close

SYNTHORA Live World Map APIPublic, credential-free JSON behind the mundo.hergertsynthora.com 3D globe: GET /mapstate returns the live ...48.0 Alteryx Gallery APIAPI for interacting with Alteryx Analytics Gallery for workflow sharing and execution.47.5 ShareThis Social Share Count APIPublic, unauthenticated GET endpoint returning aggregate social sharing metrics for any URL — clicks and sh...47.2 Recruitee Careers Site APIPublic, read-only API used by careers sites and embedded job widgets to fetch published offers, departments...45.9 CoinSpot Public APIThe Public API API from CoinSpot — 13 operation(s) for public api.43.6 Keboola Public APIUnauthenticated read access to published apps and vendors.42.5 Nace Ai Public APIThe public-api API from Nace Ai — 12 operation(s) for public-api.42.3 RubyGems.org Registry API v2Version 2 of the rubygems.org registry API. Adds gem version detail endpoints with optional platform query ...40.9 Contra Public ApiThe Public Api API from Contra — 3 operation(s) for public api.39.6

Thin 8 Limited public surface area

Thordata Public APIThe Public API API from Thordata — 1 operation(s) for public api.38.2 Clean Harbors Careers Job Query APIUnauthenticated JSON API over Clean Harbors' open positions, served from the company's own careers host and...36.1 UK Open Banking Open Data APIPublic-facing APIs enabling third-party developers to access standardized open data published by Account Se...34.1 Proof of Play Public APIThe Public API API from Proof of Play — 1 operation(s) for public api.34.0 The Coin Analysis Public APIThe Public API API from The Coin Analysis — 4 operation(s) for public api.33.3 Netsmart CareConnect Payer Provider Directory APIPublicly accessible FHIR R4 API for discovering healthcare providers, organizations, locations, services, a...28.7 Netsmart CareConnect Service Base URLs APIPublic endpoint returning an HL7 FHIR R4 Bundle of Organization and Endpoint resources that describe all av...28.7 Terna Public APIThe Public Api API from Terna — 1 operation(s) for public api.27.5

Companies reaching this through an API (22)

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.

Score breakdown

Frequency

72.0

log-scaled weighted occurrences

Breadth

6.1

spread across providers

Quality lift

21.0

mean composite of providers using it

Cohesion

40.0

strength of nearest seed neighbor

Where this tag comes from

Provider tag1174

Api tag23

Openapi tag11

Openapi op tag80

Cohort brief

Auto-generated

The 1017 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

1017

of 1168 in the catalog

Mean Kin Score

8.7

-13.5 vs catalog 22.2

Mean Agent Readiness

3.3

-8.7 vs catalog 12

Spread

0–67.9

median 5.2 · σ 10.8

How the 1017 split by band

Exemplar 2Strong 9Developing 34Thin 37Emerging 32Minimal 903

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Governance	2.4	6.5	-4.1	1017
Discoverability	49.1	57.9	-8.8	1017
Operational Transparency	3.4	13	-9.6	1017
Developer Ergonomics	11.2	23.2	-12	1017
Contract Quality	5	17.2	-12.2	1017
Access Clarity	2.9	23.9	-21	1017

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)	4%	13%	-9
MCP server (first-party)	4%	12%	-8
Agent Skills	0%	0%	0
OAuth scopes	1%	11%	-10
Security	100%	98%	+2
Arazzo workflows	1%	2%	-1
Governance rules	10%	16%	-6

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

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 (1168)

APIs with this tag (23)