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GB VAT Number Checksum Validator
x402
GB VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).
Validates whether a UK (GB) VAT number has a correct checksum, using local computation only — no HMRC registry lookup.
Price / call$0.006
Success—
StatusUnknown
How this service works
Call when an agent needs whether a GB VAT checksum is valid. No registry lookup. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-vat-gb first.
Output
Returns a boolean or structured result indicating whether the supplied GB VAT number passes the standard modulus-97 (or GB-specific) checksum algorithm. No live registry or HMRC lookup is performed — purely a local, deterministic checksum computation.
Example use cases
E-commerce checkout VAT validation
“Before I save this supplier's details, can you verify whether the VAT number GB 333289454 has a valid checksum? I don't need an HMRC registry check, just want to make sure the number is structurally correct.”
Bulk invoice data cleaning
“I have a UK VAT number from a vendor invoice — GB 107328000 — can you run a checksum validation on it to see if it's well-formed before I submit the invoice to accounting?”
Onboarding form validation
“A new business just filled in their VAT number as GB 654321987 during registration — can you quickly validate whether that checksum is correct so we know if they made a typo?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-gb?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, cheap, offline checksum validation of a GB VAT number without any live HMRC registry call. It is ideal for form validation, data cleaning, or pre-screening before a more expensive registry lookup. Prefer the free sandbox endpoint (/v1/sandbox/check-vat-gb) for testing. Do not use this if you need to confirm the VAT number is actually registered and active with HMRC.
Side effects
- Input string is empty or missing — returns error or invalid result
- Input contains non-numeric or unexpected characters that cannot be parsed as a GB VAT number
- VAT number is for a non-GB jurisdiction — result may be unreliable or incorrect
- Network or service error resulting in a non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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