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 →

Thin 1 Limited public surface area

UK Open Banking Open Data APIPublic-facing APIs enabling third-party developers to access standardized open data published by Account Se...38.2

Emerging 1 Early or largely undocumented

ApivaultApivault is a free, open-source API directory that serves as a gateway to a world of public APIs. It catalo...12.8

Score breakdown

Frequency

73.9

log-scaled weighted occurrences

Breadth

8.2

spread across providers

Quality lift

10.3

mean composite of providers using it

Cohesion

38.9

strength of nearest seed neighbor

Where this tag comes from

Provider tag1227

Api tag2

Cohort brief

Auto-generated

The 1227 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

1227

of 1228 on the roster

Mean Kin Score

8.4

-12.3 vs catalog 20.7

Mean Agent Readiness

2.2

-7.5 vs catalog 9.7

Spread

1.7–73.4

median 5.7 · σ 10.3

How the 1227 split by band

Exemplar 3Strong 16Developing 33Thin 27Emerging 32Minimal 1116

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Discoverability	58.2	60.4	-2.2	1227
Contract Governance	2.1	6.4	-4.3	1227
Operational Transparency	2.1	11.3	-9.2	1227
Contract Quality	4.2	17.5	-13.3	1227
Developer Ergonomics	2.6	17.9	-15.3	1227
Access Clarity	3.3	22.3	-19	1227

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%	16%	-15
MCP server (first-party)	0%	7%	-7
Agent Skills	0%	0%	0
OAuth scopes	1%	9%	-8
Security	87%	88%	-1
Arazzo workflows	1%	2%	-1
Governance rules	8%	13%	-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 Mailboxlayer 73.4
2 Polygon 71.5
3 Kraken 70.6
4 Last.fm 63.7
5 Shodan 63.6
6 positionstack 63.3
7 WebScraping.AI 62.6
8 OpenWeatherMap 62.3
9 IPinfo 61.9
10 Trakt 58.7

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 (1227)

APIs with this tag (2)