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Slovak VAT Number Checksum Validator
x402
Slovak VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-29).
Validates whether a Slovak (SK) VAT number passes the checksum algorithm, without performing any live registry lookup.
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs whether a SK VAT checksum is valid. No registry lookup. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-vat-sk first.
Output
Returns a boolean or structured response indicating whether the submitted Slovak VAT number string passes the SK VAT checksum algorithm. No external registry or government database is contacted — this is a pure algorithmic check.
Example use cases
E-commerce checkout VAT validation
“Before we process this order, can you verify that the Slovak VAT number SK2121318949 the customer entered is mathematically valid?”
Bulk supplier onboarding check
“We just received a new supplier registration with VAT ID SK4030000007 — can you run a checksum check on it to see if it's a valid SK VAT number before we add them to our system?”
Invoice processing compliance gate
“I have an invoice from a Slovak company listing VAT number SK2022123456 — can you confirm whether that number passes the Slovak VAT checksum so I know if it's legitimate?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-sk?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly verify the mathematical correctness of a Slovak VAT number (checksum only) without incurring the latency or cost of a live government registry lookup. Prefer the free unpaid POST /v1/sandbox/check-vat-sk endpoint first for testing or cost-sensitive scenarios. Choose this over generic regex validators when you need algorithmic checksum verification specific to Slovakia's VAT format.
Side effects
- Empty or missing value string returns a validation error
- Value exceeds 20000 character limit and is rejected
- Malformed input (non-string) causes schema error
- Network timeout or service unavailability returns a 5xx error
- Invalid x402 payment causes 402 Payment Required 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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