# W System Batch VAT Validation (VIES)

> W System Batch VAT Validation (VIES) is a paid API for AI agents from api.wsystem.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-30).

Validates multiple EU VAT numbers in a single batch call against the official VIES system, returning validity, name, and address for each.

## Facts

- Endpoint: POST https://api.wsystem.dev/verify/batch?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/w-system-batch-vat-validation-vies-6669491e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dpJfywvURJWhuF2zHIp-R

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 w-system-batch-vat-validation-vies-6669491e -d '<json body>'
```

Example prompt: Can you validate these EU VAT numbers all at once for me: DE123456789, FR12345678901, and NL123456789B01 — I need to know which ones are valid and what company names VIES returns for them.

## When to prefer this

Use this endpoint when you need to validate multiple EU VAT numbers in a single API call rather than making individual requests per number, saving time and reducing cost. Prefer this over the single-VAT endpoint when processing lists of suppliers, customers, or invoice counterparties in bulk. Ideal for KYB workflows, accounting reconciliation, and onboarding pipelines where multiple businesses must be verified simultaneously.

## Known failure modes

- VIES service temporarily unavailable for a specific EU member state (returns country-specific error)
- Invalid VAT number format causes validation error for that entry
- Rate limiting or payment failure blocks the batch request
- Empty or malformed vats array returns a validation error
- VIES returns no company name/address when the company has opted out of disclosure

## How this service works

Batch EU VAT validation via VIES (up to 100 per request)

## Output

Returns an array of results for each submitted VAT number, including validity status (valid/invalid), company name, registered address, and country code as reported by the official EU VIES system.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "vats": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/w-system-batch-vat-validation-vies-6669491e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.wsystem.dev](https://www.zero.xyz/host/api.wsystem.dev/llms.txt)