# Netherlands VAT Number Checksum Validator

> Netherlands VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Validates whether a Dutch (NL) VAT number has a correct checksum, without performing a live registry lookup.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-vat-nl?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/netherlands-vat-number-checksum-validator-458884bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mMA25cDS8DufHmFC7T6Nt

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability netherlands-vat-number-checksum-validator-458884bb -d '<json body>'
```

Example prompt: Can you check whether the Dutch VAT number 'NL123456789B01' has a valid checksum — just the math check, no registry lookup needed?

## When to prefer this

Use this endpoint when you need a fast, cheap, offline checksum validation of a Dutch VAT number without hitting the official VIES or Dutch tax registry. Ideal for form validation, data quality checks, and pre-filtering before expensive registry lookups. Always try the free sandbox endpoint POST /v1/sandbox/check-vat-nl first; pay only when the sandbox is unavailable or unsuitable.

## Known failure modes

- Input VAT string is empty or exceeds length limits — returns validation error
- Malformed input object missing the value field — returns schema error
- VAT number for a different country passed in — checksum may produce unexpected results
- Network or payment processing failure — HTTP 402 or 5xx response

## How this service works

Call when an agent needs whether a NL VAT checksum is valid. No registry lookup. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-vat-nl first.

## Output

Returns whether the provided NL VAT number passes the Dutch checksum algorithm (a mathematical validity check). Does not confirm the number is registered with the Dutch tax authority — only that the format and checksum digits are correct.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "000000012"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/netherlands-vat-number-checksum-validator-458884bb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)