# Belgium VAT Checksum Validator

> Belgium VAT Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-02).

Validates whether a Belgian VAT number has a correct checksum using pure algorithmic verification, without performing any live registry lookup.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-vat-be?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/belgium-vat-checksum-validator-1b2e0a41
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PmH5Jk7zk8A2yb0RBa4lu

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 belgium-vat-checksum-validator-1b2e0a41 -d '<json body>'
```

Example prompt: Can you check if the Belgian VAT number BE0123456749 has a valid checksum? Just the algorithmic check, no need to look it up in any registry.

## When to prefer this

Choose this endpoint when you need a fast, offline, purely algorithmic checksum validation of a Belgian VAT number and do not require confirmation that the company is actually registered. Prefer the free sandbox endpoint /v1/sandbox/check-vat-be first to avoid costs during development. Use this paid endpoint in production when the sandbox is unavailable or when you need reliable SLA guarantees.

## Known failure modes

- Input string is empty or exceeds length limits — rejected with validation error
- Non-BE prefix or incorrect length VAT number may return invalid result or error
- Network or payment failure (x402 USDC payment not completed) results in 402 response
- Malformed JSON body returns 400 error

## How this service works

Call when an agent needs whether a BE VAT checksum is valid. No registry lookup. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-vat-be first.

## Output

Returns a boolean or structured result indicating whether the provided Belgian VAT number passes the mod-97-based checksum algorithm, with no external registry or VIES lookup performed.

## 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": [
    "0000000097"
   ],
   "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/belgium-vat-checksum-validator-1b2e0a41/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)