# Italian VAT Number Checksum Validator

> Italian VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Validates an Italian VAT number (Partita IVA) by verifying its checksum algorithm, without performing a live registry lookup.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-vat-it?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/italian-vat-number-checksum-validator-9ed3862f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ROfgoPkxGUE-9Eq-O3EOA

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 italian-vat-number-checksum-validator-9ed3862f -d '<json body>'
```

Example prompt: Can you check if the Italian VAT number IT12345678903 has a valid checksum — I just need to know if it's structurally correct, no need to look it up in any registry.

## When to prefer this

Use this endpoint when you need fast, offline checksum validation of an Italian VAT number without incurring the cost or latency of a live government registry lookup. Ideal for pre-filtering obviously invalid numbers before more expensive registry checks, or when registry access is unavailable. Prefer the free sandbox variant (/v1/sandbox/check-vat-it) for testing.

## Known failure modes

- Empty or missing value field returns an error
- Value exceeding 20000 characters rejected
- Malformed input (non-numeric characters where digits expected) may return invalid result or error
- Payment of exactly $0.005 USDC required; incorrect payment amount results in 402 rejection
- Sandbox endpoint at /v1/sandbox/check-vat-it should be preferred when available to avoid charges

## How this service works

Call when an agent needs whether a IT VAT checksum is valid. No registry lookup. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-vat-it first.

## Output

Returns whether the provided Italian VAT number (Partita IVA) passes the official checksum algorithm, indicating structural validity without querying any external government registry.

## 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": [
    "00000000018"
   ],
   "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/italian-vat-number-checksum-validator-9ed3862f/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)