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Portuguese VAT Number Checksum Validator
x402
Portuguese VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).
Validates the checksum of a Portuguese (PT) VAT number without performing a live registry lookup
Price / call$0.007
Success—
StatusUnknown
How this service works
Call when an agent needs whether a PT VAT checksum is valid. No registry lookup. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pt first.
Output
Returns whether the provided Portuguese VAT number string passes the mod-based checksum algorithm used for PT NIFs/NIF numbers, indicating structural validity without contacting any government registry.
Example use cases
E-commerce PT customer tax ID check
“Before I save this customer's billing info, can you verify that the Portuguese NIF 501964843 is mathematically valid?”
B2B invoice validation workflow
“I'm about to issue an invoice to a Portuguese company and I want to make sure their VAT number 500168361 passes the checksum test — can you confirm?”
Bulk onboarding form validation
“A user entered 123456789 as their Portuguese NIF during signup — does that number have a valid PT VAT checksum?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-pt?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.007 USDC) offline checksum validation of a Portuguese VAT/NIF number and do not need to confirm whether the number is actually registered with the Portuguese tax authority. Prefer the free sandbox endpoint POST /v1/sandbox/check-vat-pt for testing. Do not use this if you need live registry confirmation of the taxpayer's existence or status.
Side effects
- Input VAT string is empty or exceeds 20000 characters — rejected by schema validation
- Non-numeric or improperly formatted string may return invalid result rather than an error
- Service unavailable returns HTTP 5xx
- Payment not received or x402 payment protocol issue results in 402 response before processing
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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