# EU VAT Number Validator

> EU VAT Number Validator is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Validates a single EU VAT number offline, checking country prefix, format, and check-digit algorithm where available, with explicit indication of whether checksum was verified.

## Facts

- Endpoint: POST https://flat-rate-llm.kikoribera03.workers.dev/v1/util/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/eu-vat-number-validator-ceadf4e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_seBbcRqTb2dFry6t3IabH

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 eu-vat-number-validator-ceadf4e6 -d '<json body>'
```

Example prompt: Can you check whether the VAT number DE811197711 is valid — specifically whether the format is correct and if the check digit passes?

## When to prefer this

Choose this endpoint when you need fast, deterministic, offline EU VAT number validation without making a live call to the EU VIES database. It is ideal for batch-cleaning company lists, validating form inputs at scale, or any scenario where network latency or VIES availability is a concern. If you need to confirm a VAT number is currently active in the VIES registry (not just correctly formatted), you would need a live VIES lookup instead.

## Known failure modes

- Unrecognized or non-EU country prefix returns valid=false with no country match
- Malformed input with unsupported characters may return formatValid=false
- For countries without a published check-digit algorithm, checksumVerified is false and checksumValid may be null
- Very unusual spacing or delimiter styles may prevent normalization

## How this service works

60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.

## Output

Returns a JSON object with the original and normalized VAT number, a boolean valid flag, the detected country code, whether the format is valid, whether the checksum is valid, whether the checksum was actually verified (as opposed to only format-checked), and the count of EU countries for which checksum verification is supported.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "vat"
 ],
 "properties": {
  "vat": {
   "type": "string",
   "description": "The VAT number, with or without the country prefix and with any spacing."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "vat": {
   "type": "string"
  },
  "valid": {
   "type": "boolean"
  },
  "country": {
   "type": "string"
  },
  "normalized": {
   "type": "string"
  },
  "formatValid": {
   "type": "boolean"
  },
  "checksumValid": {
   "type": "boolean"
  },
  "checksumVerified": {
   "type": "boolean"
  },
  "countriesWithChecksum": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eu-vat-number-validator-ceadf4e6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flat-rate-llm.kikoribera03.workers.dev](https://www.zero.xyz/host/flat-rate-llm.kikoribera03.workers.dev/llms.txt)