otwarteapi-pl

otwarteapi.pl is a Polish public API catalog that aggregates open government and international datasets. It provides machine‑readable listings of APIs across 40 jurisdictions, covering tax registers, company registries, statistical data, weather, and more, all without mandatory authentication for most endpoints. The platform offers an AI‑friendly llms.txt and a .well-known/ai-catalog.json manifest, enabling agents to discover and query APIs automatically.

otwarteapi-pl is profiled on the APIs.io network. Tagged areas include Company, OpenData, Government, API-Catalog, and Poland.

otwarteapi-pl’s developer surface includes documentation, API reference, and 5 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

7.1/100 minimal Agent 3/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

CompanyOpenDataGovernmentAPI-CatalogPoland

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 7.1/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/otwarteapi-pl/apis.yml: open an issue on github.com/api-evangelist/otwarteapi-pl to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Otwarteapi Pl Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: otwarteapi-pl
name: otwarteapi-pl
image: https://otwarteapi.pl/brand/og-image.png
description: otwarteapi.pl is a Polish public API catalog that aggregates open government and international datasets. It provides
  machine‑readable listings of APIs across 40 jurisdictions, covering tax registers, company registries, statistical data,
  weather, and more, all without mandatory authentication for most endpoints. The platform offers an AI‑friendly llms.txt
  and a .well-known/ai-catalog.json manifest, enabling agents to discover and query APIs automatically.
url: https://artifacts.apis.io/otwarteapi-pl/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- OpenData
- Government
- API-Catalog
- Poland
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: LLMsTxt
  url: llms/otwarteapi-pl-llms.txt
- type: Hosts
  url: hosts/otwarteapi-pl-hosts.yml
- type: Vendors
  url: vendors/otwarteapi-pl-vendors.yml
- type: DomainSecurity
  url: security/otwarteapi-pl-domain-security.yml
- type: Website
  url: https://otwarteapi.pl/
- type: Documentation
  url: https://otwarteapi.pl/llms.txt
- type: APIReference
  url: https://otwarteapi.pl/.well-known/ai-catalog.json
apis: []
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The provider offers a public HTML catalog but no OpenAPI, AsyncAPI, GraphQL, gRPC, or WSDL specifications are available.
  evidence:
  - url: https://otwarteapi.pl/
    status: 200
  checked: '2026-10-31'
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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