# Synergy VAT Number Validation (EU VIES)

> Synergy VAT Number Validation (EU VIES) is a paid API for AI agents from api.exo-trust.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Validates a European VAT number against the EU VIES register to confirm its authenticity and registration status.

## Facts

- Endpoint: POST https://api.exo-trust.com/execute/validate_vat
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synergy-vat-number-validation-eu-vies-91b20156
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W5RIPoEQqhlPGUxRQb4f_

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 synergy-vat-number-validation-eu-vies-91b20156 -d '<json body>'
```

Example prompt: Can you check if the VAT number DE123456789 is valid for Germany by looking it up against the EU VIES register?

## When to prefer this

Use this endpoint when you need a deterministic, authoritative lookup of a European VAT number against the official EU VIES register. Prefer it for B2B invoicing compliance, supplier onboarding, or fraud prevention workflows where you need to confirm a VAT number is genuinely registered — not just formatted correctly. It is keyless (no separate API key required) and returns an authoritative result from the European Commission's own service.

## Known failure modes

- Invalid or malformed VAT number format returns a validation error
- Country code not matching a recognized EU member state returns an error
- VIES register temporarily unavailable causes a service timeout or error response
- VAT number not found in VIES returns a 'not valid' or 'not registered' result
- Missing required fields (vat_number or country_code) returns a 400-level error

## How this service works

Validate a European VAT number against the EU VIES register (keyless deterministic lookup of the European Commission checkVatService).

## Output

Returns whether the provided VAT number is valid and registered in the EU VIES system, along with any available registration details such as company name and address tied to the VAT number.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "vat_number": {
   "type": "string"
  },
  "country_code": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synergy-vat-number-validation-eu-vies-91b20156/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.exo-trust.com](https://www.zero.xyz/host/api.exo-trust.com/llms.txt)