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Toll402 Danish CVR Number Validator
x402
Toll402 Danish CVR Number Validator is a paid API for AI agents from toll402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a Danish CVR-nummer (8-digit business registration number) by normalizing input, checking length, and verifying the modulus-11 checksum offline
Price / call$0.001
Success—
StatusUnknown
How this service works
Offline validator for a Danish CVR-nummer (8-digit business registration number issued by the Danish Business Authority). Normalizes input to digits only, checks length and computes a modulus-11 checksum using weights 2,7,6,5,4,3,2 on the first 7 digits compared against the 8th check digit. Result is flagged as best-effort since some legacy CVR numbers do not conform to the checksum rule.
Output
Returns a validation result indicating whether the CVR number passes format and modulus-11 checksum checks, with a best-effort flag noting that some legacy CVR numbers may not conform to the checksum rule even if legitimate
Example use cases
Supplier onboarding CVR check
“Before we add this Danish supplier to our system, can you validate their CVR number 34567890 to make sure it's properly formatted and passes the checksum?”
E-commerce checkout business verification
“A customer entered 87654321 as their Danish CVR number at checkout — is that a valid CVR-nummer?”
Bulk data cleansing pre-check
“We have a Danish company in our database with CVR number 10203040 — can you validate whether that number is correctly formed and passes the modulus-11 check?”
Technical details
Endpoint
POSThttps://toll402.dev/v1/t/cvr_dk_validateWhen to prefer
Use this endpoint when you need a fast, offline, zero-latency check of a Danish CVR-nummer's structural validity without calling the Danish Business Authority's live registry. Ideal for pre-validation before submitting to official APIs, bulk data cleansing, or form validation where real-time registry lookup is unnecessary or too costly.
Side effects
- Input CVR is not 8 digits after normalization — validation fails with length error
- CVR checksum does not match — flagged as invalid but best-effort note applies for legacy numbers
- Non-numeric characters that can't be normalized cause a parsing error
- Empty or missing CVR field returns a required field error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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