VAT and Tax ID Validator
VAT, tax ID and national ID validator: check a national identity, tax or company registration number against its country's official checksum rule. Covers 23 countries including NL BSN, ES NIF/NIE/CIF, IT codice fiscale, FR SIREN/SIRET, DE Steuer-ID, BE/PL/CZ national numbers, SE/NO/DK/FI personal numbers, BR CPF/CNPJ, AU ABN/TFN, UK NINo, IE PPS, US NPI/EIN. Structure and check digit only, no registry lookup; the number is never stored (logs keep only its length and character types).
Offering
- Provider
- api.duoleads.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Legal And Compliance
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.duoleads.com/v1/id/national- MIME type
- application/json
- First seen
- 2026-10-16T01:50:32.458Z
- Last seen
- Tags
- VAT, vat-number, tax-id, identifiers, Validation
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.05 USDC
Atomic price: 50000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "50000",
"payTo": "0xCD673f7e1daD254347AEab6be0DEFe8b9C6b3A39"
}
]Observed health
- Status
- Healthy
- Latest latency
- 39 ms
- Average latency
- 469 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"country": {
"type": "string",
"description": "ISO 3166-1 alpha-2 country code, case-insensitive. One of the 23 supported countries; the United Kingdom is accepted as UK or GB (the response echoes what you sent).",
"maxLength": 16
},
"kind": {
"type": "string",
"description": "Identifier type for that country, e.g. bsn, nif, cf, cpf.",
"maxLength": 32
},
"value": {
"type": "string",
"description": "The identifier. Separators (space . - /) are stripped before checking.",
"maxLength": 64
}
},
"required": [
"country",
"kind",
"value"
]
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"country": {
"description": "ISO 3166-1 alpha-2 country code, case-insensitive. One of the 23 supported countries; the United Kingdom is accepted as UK or GB (the response echoes what you sent).",
"maxLength": 16,
"type": "string"
},
"kind": {
"description": "Identifier type for that country, e.g. bsn, nif, cf, cpf.",
"maxLength": 32,
"type": "string"
},
"value": {
"description": "The identifier. Separators (space . - /) are stripped before checking.",
"maxLength": 64,
"type": "string"
}
},
"required": [
"country",
"kind",
"value"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"algorithm": {
"type": "string"
},
"country": {
"type": "string"
},
"derived": {
"properties": {
"birth_date": {
"type": "string"
},
"birth_month": {
"type": [
"number",
"null"
]
},
"birth_year_yy": {
"type": "string"
},
"birthplace_code": {
"type": "string"
},
"century_assumed": {
"type": "boolean"
},
"department_code": {
"type": "string"
},
"sex": {
"type": "string"
}
},
"type": "object"
},
"formatted": {
"type": [
"string",
"null"
]
},
"kind": {
"type": "string"
},
"normalised": {
"type": [
"string",
"null"
]
},
"reason": {
"type": [
"string",
"null"
]
},
"valid": {
"type": "boolean"
}
},
"required": [
"valid",
"country",
"kind",
"algorithm",
"normalised",
"formatted",
"reason",
"derived"
],
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"description": "RFC 3339 UTC with milliseconds",
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"items": {
"required": [
"id",
"version",
"published"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true
},
"route": {
"const": "/v1/id/national"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}