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Toll402 VKN Validator
x402
Toll402 VKN 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 VAT registration number (CVR/VKN) offline, checking format correctness
Price / call$0.001
Success—
StatusUnknown
How this service works
The OpenRouter for AI-agent tools: one gateway, one wallet, every capability. Built-in tools, forged tools, a global verified business directory and 2,000+ aggregated x402 services, all paid per call in USDC via x402 (HTTP 402). No signup, no API key.
Output
Returns a JSON object with an 'ok' boolean field indicating whether the provided VKN string is a validly formatted Danish VAT registration number. No network lookup is performed — this is a pure offline format/checksum validation.
Example use cases
Invoice pre-submission VAT check
“Before I send this invoice to my Danish supplier, can you validate their VAT number 12345678 to make sure the format is correct?”
Onboarding Danish business partner
“We're onboarding a new Danish company and they gave us VKN 87-65-43-21 — can you verify that's a properly formatted Danish VAT registration number?”
Bulk data cleanup for Danish customers
“I've got a Danish customer record with VKN '23 45 67 89' — can you validate it so I know if it's a real format before we import it into our system?”
Technical details
Endpoint
POSThttps://toll402.dev/v1/t/vkn_validateWhen to prefer
Choose this endpoint when you need fast, free-of-external-dependency offline validation of a Danish VKN (CVR) number format — for example, before submitting invoices, onboarding Danish business partners, or cleaning up CRM data. It accepts numbers with spaces or dashes, making it robust for user-entered data. Prefer it over manual regex checks or full government API lookups when you only need format verification.
Side effects
- Malformed input (non-string or missing vkn field) returns an error
- VKN with invalid checksum or wrong digit count returns ok: false
- Network or gateway errors may return HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true
}
}Tags
x402
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