grundfast-dk

Grundfast provides a drop-in compatibility API that mirrors the legacy services.datafordeler.dk endpoints for Danish property and geodata (BBR, Matrikel, valuation, building lines, CVR, etc.) ensuring continuity after Datafordeler's shutdown on 15 January 2027. It offers a single API key, auto‑pagination, and a free tier, serving cached data when the upstream service is unavailable.

grundfast-dk publishes 1 API contract indexed on the APIs.io network: Grundfast API. Tagged areas include RealEstate, Geodata, API, Denmark, and Compatibility.

The grundfast-dk catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

grundfast-dk’s developer surface includes sandbox, authentication, pricing, changelog, documentation, API reference, getting-started guide, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

59.6/100 strong Agent 30/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

RealEstateGeodataAPIDenmark Compatibility

Kin Score

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

Composite quality — 59.6/100 · strong

Contract Quality 8.2 / 21

Developer Ergonomics 11.6 / 17

Access Clarity 6.6 / 17

Operational Transparency 8.4 / 11

Contract Governance 8.1 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 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 Horizontal (data, software, accessibility, platform) 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):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 38.7 — up to +15.3 composite points
Access Clarity scores 38.9 — up to +12.2 composite points
Developer Ergonomics scores 68.3 — up to +6.3 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/grundfast-dk/apis.yml: open an issue on github.com/api-evangelist/grundfast-dk 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 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Grundfast API

REST over Datafordeler — BBR ejendom (BFE-keyed), Matriklen, DAGI, DHM, Stednavne, DAR address resolution, and CVR company lookup; translated kodelister, WGS84 geometry, and a p...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

grundfast-dk MCP Server

Remote MCP server at grundfast.dk.

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

grundfast

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Grundfast Dk Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Grundfast Dk Rate Limits

9 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Grundfast Dk Context

96 classes · 224 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

grundfast-dk API Rules

13 rules · 8 errors 3 warnings 2 info

SPECTRAL

Security Posture 3

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

Grundfast Dk Authentication

3 schemes

SECURITY

Grundfast Dk Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Grundfast Dk Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Grundfast Dk Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Conformance

DataModel

Lifecycle

ErrorCatalog

Scroll for all 7

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Security

Authentication

OAuthScopes

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

StatusPage

ChangeLog

Support

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: grundfast-dk
name: grundfast-dk
description: Grundfast provides a drop-in compatibility API that mirrors the legacy services.datafordeler.dk endpoints for
  Danish property and geodata (BBR, Matrikel, valuation, building lines, CVR, etc.) ensuring continuity after Datafordeler's
  shutdown on 15 January 2027. It offers a single API key, auto‑pagination, and a free tier, serving cached data when the
  upstream service is unavailable.
url: https://artifacts.apis.io/grundfast-dk/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- RealEstate
- Geodata
- API
- Denmark
- Compatibility
image: https://grundfast.dk/og/home.png?v=5
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/grundfast-dk-rules.yml
- type: JSONLD
  url: json-ld/grundfast-dk-context.jsonld
- type: Vocabulary
  url: vocabulary/grundfast-dk-vocabulary.yml
- type: Conformance
  url: conformance/grundfast-dk-conformance.yml
- type: RateLimits
  url: rate-limits/grundfast-dk-rate-limits.yml
- type: Plans
  url: plans/grundfast-dk-plans-pricing.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/grundfast-dk-data-model.yml
- type: Sandbox
  url: sandbox/grundfast-dk-sandbox.yml
- type: Security
  url: security/grundfast-dk-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/grundfast-dk-authentication.yml
- type: OAuthScopes
  url: scopes/grundfast-dk-scopes.yml
- type: Lifecycle
  url: lifecycle/grundfast-dk-lifecycle.yml
- type: ErrorCatalog
  url: errors/grundfast-dk-problem-types.yml
- type: LLMsTxt
  url: llms/grundfast-dk-llms.txt
- type: MCPServer
  url: mcp/grundfast-dk-mcp.yml
- type: SecurityTxt
  url: well-known/grundfast-dk-security.txt
- type: WellKnown
  url: well-known/grundfast-dk-well-known.yml
- type: Hosts
  url: hosts/grundfast-dk-hosts.yml
- type: StatusPage
  url: https://grundfast.dk/status
- type: Pricing
  url: https://grundfast.dk/en/pricing
- type: ChangeLog
  url: https://grundfast.dk/changelog
- type: VulnerabilityDisclosure
  url: security/grundfast-dk-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/grundfast-dk-domain-security.yml
- type: Website
  url: https://grundfast.dk/
- type: DeveloperPortal
  url: https://grundfast.dk/docs
- type: Documentation
  url: https://grundfast.dk/docs
- type: APIReference
  url: https://grundfast.dk/openapi.json
- type: GettingStarted
  url: https://grundfast.dk/?format=md
- type: Support
  url: https://grundfast.dk/kontakt
- type: GitHubOrganization
  url: https://github.com/grundfast
apis:
- name: Grundfast API
  description: REST over Datafordeler — BBR ejendom (BFE-keyed), Matriklen, DAGI, DHM, Stednavne, DAR address resolution,
    and CVR company lookup; translated kodelister, WGS84 geometry, and a property-keyed batch.
  humanURL: https://grundfast.dk/docs
  baseURL: https://api.grundfast.dk
  properties:
  - type: OpenAPI
    url: https://grundfast.dk/openapi.json
  aid: grundfast-dk:grundfast-api
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-30'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://grundfast.dk/openapi.json
    status: null
  - url: https://api.grundfast.dk/openapi.json
    status: null
  - url: https://grundfast.dk/mcp
    status: 401
  - url: https://api.grundfast.dk/mcp
    status: 401
  - url: https://grundfast.dk/
    status: 200
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 31
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

grundfast-dk API — frequently asked questions

Does grundfast-dk have an API?

Yes. APIs.io lists 1 API from grundfast-dk, including Grundfast API.

Is there an OpenAPI specification for the grundfast-dk API?

Yes. APIs.io indexes 1 OpenAPI specification for grundfast-dk, each linked for download from this page.

How do I authenticate with the grundfast-dk API?

grundfast-dk uses bearer-token authentication (3 schemes). The details are profiled on APIs.io as Grundfast Dk Authentication.

How much does the grundfast-dk API cost?

APIs.io lists 5 pricing plans for grundfast-dk, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does grundfast-dk have an MCP server?

Yes. APIs.io lists 1 MCP server for grundfast-dk: Remote MCP server at grundfast.dk.

Is the grundfast-dk API ready for AI agents?

grundfast-dk has a Kin Score of 59.6 out of 100 (strong) and an Agent Readiness score of 30.1 (agent-ready), scored by API Evangelist on 2026-10-31.

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