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Swedish VAT Number Checksum Validator
x402
Swedish VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).
Validates the checksum of a Swedish VAT number (SE format) without performing any live registry lookup.
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs whether a SE VAT checksum is valid. No registry lookup. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-vat-se first.
Output
A response indicating whether the submitted Swedish VAT number passes the SE VAT checksum algorithm. Returns a validity boolean or equivalent signal; does not confirm registration with the Swedish tax authority — only structural/algorithmic correctness.
Example use cases
E-commerce supplier onboarding check
“We're onboarding a Swedish supplier and they gave us VAT number SE556012345601 — can you validate the checksum to make sure it's structurally correct before we add them to our system?”
Invoice validation before payment
“Before I approve this invoice from a Swedish vendor, can you verify that their VAT number SE998877665501 actually passes the checksum test?”
Bulk form submission preflight
“A user just entered SE123456789001 as their Swedish VAT number in our checkout form — can you quickly check if that checksum is valid so I can show them an error if it's wrong?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-se?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap, offline checksum validation of a Swedish VAT number and do not need live registry confirmation. Prefer the free sandbox endpoint POST /v1/sandbox/check-vat-se first for testing. Choose this over a full registry lookup API when latency and cost matter and structural validity is sufficient.
Side effects
- Empty or missing value field returns validation error
- Input longer than 20000 characters rejected
- Non-SE-prefixed strings may return invalid or error
- Malformed JSON body returns 400-level error
- Payment not included or insufficient USDC triggers 402 Payment Required
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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