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Finnish VAT Number Checksum Validator
x402
Finnish VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).
Validates the checksum of a Finnish (FI) VAT number without performing a live registry lookup
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs whether a FI VAT checksum is valid. No registry lookup. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-vat-fi first.
Output
A response indicating whether the provided Finnish VAT number passes or fails the algorithmic checksum test, without querying any external tax authority registry
Example use cases
Invoice validation before payment
“Before I pay this invoice from a Finnish supplier, can you verify that their VAT number FI23456781 passes checksum validation?”
Bulk supplier onboarding check
“We're onboarding a Finnish vendor and they gave us VAT number FI12345670 — can you confirm the checksum is valid so we can proceed with the contract?”
E-commerce checkout VAT field verification
“A customer entered FI87654321 as their Finnish VAT number during checkout — can you tell me if that number has a valid checksum?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-fi?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, offline checksum verification of a Finnish VAT number and do not require confirmation that the business is actually registered with the Finnish Tax Administration. It is cheaper and faster than a live registry lookup. Try the free sandbox endpoint POST /v1/sandbox/check-vat-fi first before paying $0.004 USDC per call on this production endpoint.
Side effects
- Empty or missing value field returns validation error
- Value exceeds 20,000 character limit
- Non-FI VAT format provided may return invalid or error
- Malformed request body returns 400-level error
- Payment failure or insufficient USDC balance blocks the request
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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