API Commons · Open Data · de facto

The CKAN Action API

220 portals in the API Evangelist catalog run CKAN, across 210 distinct hosts. A version-spread sample was probed read-only; 36 produced usable results and are the denominator.

134operations graded

63core tier

2extended

69vendor only

48adopters recorded

How it was measured

Tiers are measured by calling the actions against live portals, and the action list is read from CKAN's source. Neither number comes from our own harvested artifacts, which measure our harvester rather than the portals.

This is a version-drift cohort. These are not independent reimplementations of one interface — they are the same software at different releases, so an absent operation usually means an older install rather than a design decision.

The core tier

What a provider has to implement before a compatibility claim means anything. Every placement is measured, and the evidence for each sits in the tier profile.

organization_list_for_userstatus_showdataset_followee_countdataset_followee_listdataset_follower_listget_site_usergroup_followee_countgroup_followee_listgroup_follower_countgroup_follower_listgroup_listhelp_show

Adopters

Evidence	Count	What it means
tested	36	The operations were called against a live endpoint.
prose	12	Says so, and publishes nothing a reader can check.

Every entry in the registry carries the URL it was read from and the date it was read. A claim is never promoted to a verdict.

Providers that reach a tier

6 of the 48 recorded adopters demonstrably reach the core tier or better.

Dados RSOpenDataNI (Northern Ireland)San Bernardino County ATC OpenDataAcre Open DataSatu Data Bencana Indonesia (BNPB)Turin Open Data

Artifacts

Everything this standard publishes. All of it is generated from the profile, so a re-measurement moves every artifact together.

OpenAPI open-data/main/standard/ckan-action-v3/openapi.yml Tier profile open-data/main/standard/ckan-action-v3/profile.yml Arazzo workflow open-data/main/standard/ckan-action-v3/arazzo/core-conformance.yml MCP tools open-data/main/standard/ckan-action-v3/mcp/tools.json Spectral ruleset open-data/main/standard/ckan-action-v3/spectral/ckan-profile.yaml Adopter registry open-data/main/adopters/ckan-action-v3.yml Repository open-data Documentation https://apicommons.org/standards/open-data/ License open-data/blob/main/LICENSE

Source

Originator	CKAN
Read from	https://github.com/ckan/ckan
Upstream licence	AGPL-3.0 (the software). The interface description here is authored, not copied: CKAN publishes no machine-readable specification of its Action API, and a licence on an implementation does not govern a description of the HTTP surface it serves.
Pinned at	`0731a7a4ab76dd11889eb89a892b3feae4fd69a8`
API Commons	https://apicommons.org/standards/open-data/ · https://github.com/api-commons/open-data

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