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Verify UK VAT Number Format & Check-Digit Validator
x402
Verify UK VAT Number Format & Check-Digit Validator is a paid API for AI agents from verify-uk.verifyuk.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Validates a UK VAT number's format and HMRC check-digit (mod 97/9755) without making a live HMRC registration call
Price / call$0.001
Success—
StatusUnknown
How this service works
UK VAT number format + check-digit test: Checks a UK VAT number's format and HMRC check digits (mod 97 / 9755). Catches fake or mistyped VAT numbers instantly without an HMRC call. Use /v1/business/check to confirm live registration.
Output
A JSON object containing a 'valid' boolean indicating whether the VAT number passes format and check-digit validation, plus a 'notes' array with human-readable explanations of any failures (e.g. wrong length, failed HMRC check-digit test).
Example use cases
Screen supplier VAT numbers at onboarding
“I'm onboarding a new UK supplier and they gave me VAT number GB294627287 — can you quickly check if it's a valid format and passes the check-digit test before I add them to our system?”
Catch typos in user-submitted VAT fields
“A customer just entered 123456780 as their UK VAT number on our checkout form — can you validate the format and check-digits to see if it's likely a typo or fake?”
Pre-screen VAT numbers before HMRC API call
“Before I use an HMRC lookup to confirm live registration, can you first validate whether GB999999973 even has the right format and passes the mod 97 check-digit test?”
Technical details
Endpoint
GEThttps://verify-uk.verifyuk.workers.dev/v1/validate/vat?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, free-of-HMRC-quota format and check-digit validation of a UK VAT number — ideal for pre-screening user inputs, catching typos, or filtering obviously fake numbers before spending an HMRC live-lookup call. Prefer this over /v1/business/check when you don't need to confirm active registration, just structural validity.
Side effects
- Missing 'vat' query parameter — returns error indicating required field is absent
- VAT number with invalid characters — flagged as invalid format with explanatory note
- Network timeout on the Cloudflare Worker — transient failure, retry recommended
- VAT number that looks correct in length but fails mod 97/9755 check — returns valid:false with a note explaining the check-digit failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"notes": [
"Right length, but fails the HMRC check-digit test."
],
"valid": false
}
}Tags
x402
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