c0mm0.com — the continuously verified register of European data

About

About c0mm0.com

c0mm0.com is the continuously verified register of official European and UK public data — APIs, datasets, and open-data portals. Every entry is discovered, verified, and graded automatically, so a developer, researcher, or AI agent always lands on something actionable: a direct download, a runnable request, or an honest statement of what's missing.

How it works

Discovery

We automatically discover public-sector APIs, datasets, and portals from official portals, government registries, and other trusted sources.

Verification

Every entry is re-checked on a rolling 6-hour cadence, and the request that proved it alive is stored — so "verified" always comes with a working call you can run yourself.

Access grading

Each entry is graded direct, documented, or reference-only: whether its primary action yields the data itself (a download, a runnable query), machine-readable documentation, or just a landing page. Filter the catalog by grade and format.

Provenance & links

Every value carries provenance, and profiled fields are matched to canonical join keys (SIRET, NUTS, GSS, …) so sources that share a key can be joined across publishers.

Free-access classification

We use explicit, strict classification for free access to help you find tools that are genuinely usable:

  • FREE_NO_AUTHNo authentication required at all
  • FREE_KEY_REQUIREDFree tier, but requires API-key registration
  • FREE_TRIALLimited-time trial or temporary access
  • FREE_OSS_EDUFree for open-source or educational use

Takedown policy

We respect intellectual property and privacy. If you own an API or dataset listed in our directory and would like it removed:

  • Contact us with proof of ownership
  • Specify which entry you want removed
  • We will process requests within 48 hours

We also respect robots.txt directives and do not bypass paywalls or login walls.

Privacy

We take privacy seriously:

  • We never store user API keys or secrets
  • We do not proxy user requests
  • Submitter emails are optional and only used for notifications
  • We only collect publicly available information

API access

Our directory data is available via a public REST API:

GET  /api/v1/entries                    # List (filter: ?access_level=direct&format=CSV)
GET  /api/v1/entries/:slug              # Entry + Access Contract (ranked actions)
GET  /api/v1/entries/:slug/related      # Graph: relations, publishers, join keys
GET  /api/v1/entries/:slug/dcat.jsonld  # Per-entry DCAT-AP record
GET  /api/v1/graph/edges                # Bulk graph export
POST /mcp                               # MCP server (search, access, joins)
POST /api/v1/submissions                # Submit new entry

See our methodology for how we score, verify, and track provenance.