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Spanish Tax ID Validator (DNI/NIE/CIF)
x402
Spanish Tax ID Validator (DNI/NIE/CIF) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Validates Spanish tax identifiers — DNI/NIF, NIE, and company CIF — by computing and verifying the check digit locally without storing the ID.
Price / call$0.003
Success—
StatusUnknown
How this service works
Spanish tax ID validation (DNI/NIF, NIE and company CIF) with check-digit verification. Computed locally; the ID is not stored.
Output
Returns a JSON object with a boolean 'valido' indicating whether the ID is valid, 'tipo' indicating the detected ID type (DNI, NIE, or CIF), 'valor' with the normalized input, and 'motivo' providing a reason or error message when the ID is invalid.
Example use cases
KYC onboarding form validation
“Before we let this user complete registration, can you verify that their Spanish ID '47521369B' is a valid DNI with a correct check digit?”
B2B invoice recipient verification
“I need to send an invoice to a Spanish company with CIF 'B83948217' — can you check whether that's a valid CIF?”
NIE check for foreign resident
“Can you validate the NIE 'X1234567L' for me? I want to make sure it's correctly formatted and the letter is right before filing the tax return.”
Technical details
Endpoint
POSThttps://api.vextorium.com/validar-nif-pago?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, privacy-preserving check-digit validation of Spanish personal or corporate tax IDs (DNI, NIE, NIF, CIF) without sending the ID to a third-party storage system. It is computed locally on the server with no persistence, making it suitable for GDPR-sensitive workflows. Prefer it over full KYC services when you only need format and check-digit correctness, not identity database lookups.
Side effects
- Malformed or empty 'valor' string returns valido: false with a descriptive motivo
- Unrecognizable format (neither DNI, NIE, nor CIF pattern) returns null tipo and valido: false
- Correct format but wrong check digit returns valido: false with motivo explaining the mismatch
- Network or payment authorization failure returns an HTTP error before any validation is performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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