# Estonia VAT Number Checksum Validator

> Estonia VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Validates the checksum of an Estonian (EE) VAT number without performing a live registry lookup

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-vat-ee?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/estonia-vat-number-checksum-validator-8a429754
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rn1qXKnA5OINSDjdeweFB

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 estonia-vat-number-checksum-validator-8a429754 -d '<json body>'
```

Example prompt: Can you check whether the Estonian VAT number EE123456789 has a valid checksum — just a local format check, no registry lookup needed?

## When to prefer this

Use this endpoint when you need fast, offline checksum-only validation of an Estonian VAT number and do not require a live VIES or Estonian Tax Authority registry lookup. Ideal for real-time form validation, pre-screening, or situations where network calls to external registries are unavailable or undesirable. At $0.001 USDC per call it is cost-effective for high-frequency checks; use the free sandbox endpoint /v1/sandbox/check-vat-ee first during development.

## Known failure modes

- Input string is empty or missing — returns validation error
- VAT number exceeds 20000 character limit — rejected
- Malformed input not matching EE VAT format — may return invalid or error
- Network or payment failure prevents request from completing

## How this service works

Call when an agent needs whether a EE VAT checksum is valid. No registry lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-vat-ee first.

## Output

Returns a boolean or structured result indicating whether the provided Estonian VAT number passes the local checksum algorithm, without querying any external tax authority 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": [
    "000000013"
   ],
   "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/estonia-vat-number-checksum-validator-8a429754/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)