# chainverdict.xyz EU VAT Number Format Validator

> chainverdict.xyz EU VAT Number Format Validator is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Validates the structure and check digits of an EU VAT number by country-specific rules, without performing a live VIES registry lookup.

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/validate/vat/:vat
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-xyz-eu-vat-number-format-validator-975f5bb9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dgtnf80kd9wYWzKRUuYh3

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 chainverdict-xyz-eu-vat-number-format-validator-975f5bb9
```

Example prompt: Can you check if the VAT number DE345789013 has a valid format and correct check digits — just the structure check, I don't need a live registry lookup.

## When to prefer this

Choose this endpoint when you need a fast, cheap ($0.001), offline-style format check of an EU VAT number — e.g., during form validation, invoice ingestion, or pre-screening — and do not need to confirm the number is actively registered in VIES or belongs to a specific named trader. It is not a substitute for a live VIES lookup when regulatory confirmation of active status is required.

## Known failure modes

- Malformed or missing VAT number path parameter returns an error
- Unrecognized country prefix may return invalid or unsupported country error
- VAT number with correct format but belonging to an inactive or non-existent business will still pass (format-only check)
- Non-EU VAT numbers are not supported
- Network timeout or service unavailability returns a 5xx error

## How this service works

Validate an EU VAT number's structure and per-country check digits. Format only — no VIES lookup, so it does not confirm the registration is active or belongs to the named trader.

## Output

Returns whether the EU VAT number passes structural validation and check digit rules for the given country prefix, without confirming active VIES registration or trader identity.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "vat"
     ],
     "properties": {
      "vat": {
       "type": "string",
       "description": "EU VAT number incl. country prefix"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-xyz-eu-vat-number-format-validator-975f5bb9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)