# Grundfast MCP

MCP server exposing 12 tools for Danish public registers including BBR, Matriklen, DAR addresses, CVR, and elevation data.

## Access profile

| Field | Value |
| --- | --- |
| Category | MCP |
| Sector | Government |
| Access type | Direct |
| Auth required | API Key |
| Reliability | Stable |
| Official | No |
| Status | active |
| Agent can | read, search |

## Links

- Website: https://grundfast.dk/mcp-server
- Docs: https://grundfast.dk/docs
- Directory entry: https://agentaccess.dk/grundfast-mcp

## About

Grundfast provides a hosted Model Context Protocol (MCP) server that connects AI agents directly to cleaned Danish public registry data. Over a single Streamable HTTP JSON-RPC endpoint (https://api.grundfast.dk/mcp), agents get 12 structured tools covering BBR property rollups and bitemporal history, Matriklen cadastral parcels, DAR address autocomplete and geocoding, CVR company lookups, DHM terrain elevation, and GeoDanmark building polygons.

## Agent use cases

- Look up BBR building and unit data for Danish properties via BFE number
- Search and validate Danish addresses with DAR autocomplete and data wash
- Retrieve CVR company registration records and company metadata
- Query bitemporal registration history for BBR buildings and addresses
- Fetch terrain and surface elevation (DHM) and GeoDanmark building polygons for coordinates

## Notes

Requires a Grundfast API key (gf_live_... or free sandbox gf_test_...) passed in the Authorization header. Operates over Streamable HTTP (JSON-RPC 2.0). Billed and metered identically to REST API calls. Independent compatibility mirror — not run by SDFI or Erhvervsstyrelsen.

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Source: [AgentAccess](https://agentaccess.dk/) — directory of agent interfaces for Denmark.