# Grundfast (grundfast.dk)

Looks up a Danish address and returns its building, cadastre, valuation, zoning and terrain data as JSON through one API key.

- Atlas card: https://inite.ai/en/atlas/grundfast.dk
- Site: https://grundfast.dk
- For: Danish property advisers, investors, developers and proptech teams needing whole-property data by address
- Use 17/100 · alive 100/100

## Used for

- run desk studies on a Danish address before site visits
- pull building, cadastre and valuation data for a property portfolio
- let AI agents look up properties via MCP

## Price

- from 99 DKK/month, free plan (read 2026-10-24 on https://grundfast.dk/en/pricing)

## For developers

- OpenAPI: https://grundfast.dk/openapi.json (281 paths)
- API docs: https://grundfast.dk/docs/api
- MCP server: dk.grundfast/danish-address-property-data (namespace; auth on 2026-10-24)
- MCP server card: https://grundfast.dk/.well-known/mcp.json
- Read 2026-10-24

## MCP server, measured daily

Server: https://api.grundfast.dk/mcp, checked every day since 2026-10-24 (3 checks).

- Answered: measuring, 3 daily checks so far
- Median first answer: 1033 ms
- Sign-in: a pasted key
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-24

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Source: INITE Atlas, https://inite.ai/en/atlas/grundfast.dk. JSON: https://inite.ai/api/atlas/grundfast.dk. MCP: https://inite.ai/api/mcp (atlas_lookup).