API documentation
One base URL, one token, JSON or XML. Sourced from Erhvervsstyrelsen and Brønnøysundregistrene directly, never proxied.
This reference is in English. The rest of the site speaks Danish, Norwegian and English.
If you're new here, start with Getting started. If you already know the basics, jump into the section that matters:
- • The lookup endpoint — one GET, six ways to search, typed endpoints
- • Includes — owners, history, events, relations, finance
- • Verify an EAN order — the EAN checkout fraud check
- • Batch lookup — up to 100 registration numbers per request
- • Advanced search — multi-filter search with cursor pagination
- • Webhooks — signed deliveries when the register changes
- • Errors — every error code and when it fires
- • Quotas — per-plan daily and monthly caps
- • MCP server — use the API from Claude or Cursor without HTTP glue
Something missing?
If a page is unclear or an answer is missing, tell us — doc feedback usually turns into a doc within a day.