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DE VAT Number Checksum Validator
x402
DE VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Validates the checksum of a German VAT (Umsatzsteuer-Identifikationsnummer) number without performing a live registry lookup.
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs whether a DE VAT checksum is valid. No registry lookup. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-vat-de first.
Output
Returns whether the provided German VAT number passes the checksum algorithm (a purely mathematical validity check), without consulting the official VIES or Bundeszentralamt für Steuern registry. The response indicates valid or invalid status based solely on the number's internal checksum.
Example use cases
E-commerce checkout VAT validation
“Before I save this supplier's billing details, can you verify that their German VAT number DE298765432 passes the checksum check?”
Invoice processing compliance check
“I'm processing a batch of invoices and need to confirm that the DE VAT number on this one — DE219876543 — is mathematically valid before I submit it to our accounting system.”
B2B onboarding form validation
“A new German business partner just filled out our onboarding form with VAT number DE123456788 — can you tell me if the checksum is valid so I know it's not a typo?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-de?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, purely mathematical checksum check on a German VAT number without triggering a live VIES or German tax authority registry lookup. Ideal for pre-validation in forms, invoicing pipelines, or onboarding flows where you want to catch obvious typos or malformed numbers before (optionally) doing a more expensive live registry check. Prefer the free sandbox endpoint /v1/sandbox/check-vat-de first if available.
Side effects
- Empty or missing VAT number string returns an error
- VAT number exceeds 20000 character limit (unlikely in practice)
- Non-DE VAT numbers may return unexpected results since the check is DE-specific
- Malformed input (non-string types) may cause validation errors
- Payment failure (x402) if USDC balance is insufficient
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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