# EU Agent Utils – SIRET Number Validation

> EU Agent Utils – SIRET Number Validation is a paid API for AI agents from eu-agent-utils.frcompanycheck.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Validates a French SIRET number offline, checking the Luhn check-digit and returning the decomposed SIREN, NIC, and derived FR VAT number.

## Facts

- Endpoint: GET https://eu-agent-utils.frcompanycheck.workers.dev/v1/fr/siret/%7Bnumber%7D?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eu-agent-utils-siret-number-validation-44b92b8d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F5gur8b4DyiDpgBbCKQ1k

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-agent-utils-siret-number-validation-44b92b8d
```

Example prompt: Can you check whether this SIRET number 73282932000074 is valid, and tell me the corresponding SIREN and French VAT number?

## When to prefer this

Choose this endpoint when you need a fast, offline, purely algorithmic SIRET check-digit and format validation without hitting INSEE or any French government database. It is ideal for pre-screening user input, supplier onboarding pipelines, or invoice processing where real-time registry lookups are not required. At $0.001 USDC per call with no account or API key needed via x402, it suits high-volume or serverless agent workflows. Prefer a live INSEE SIRENE API call if you also need legal status, address, or activity code.

## Known failure modes

- Invalid or malformed SIRET (wrong length, non-numeric characters) returns valid=false with error messages and is not charged
- SIRET fails Luhn check-digit test: returns valid=false with errors
- Network timeout on the Cloudflare Worker edge: standard HTTP 5xx
- x402 payment not completed: HTTP 402 response, no data returned

## How this service works

Cheap, deterministic utilities for AI agents, paid per call in USDC with x402 (no account, no API key): ECB euro reference FX rates and conversion, IANA time-zone conversion with explicit DST handling, European public holidays and working-day calculator (FR incl. Alsace-Moselle, BE, LU, DE, AT, IT, ES, PT), offline IBAN validation, and SIREN/SIRET and EU VAT number check-digit validation. Errors are never charged.

## Output

A JSON object containing: whether the SIRET is valid (boolean), the 9-digit SIREN, the 5-digit NIC establishment suffix, the full normalised 14-digit number, the derived French VAT number (FR + 2-digit key + SIREN), and an array of error messages if validation fails. Errors are never billed.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "nic": "00074",
  "type": "SIRET",
  "siren": "732829320",
  "valid": true,
  "errors": [],
  "number": "73282932000074",
  "fr_vat_number": "FR44732829320"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eu-agent-utils-siret-number-validation-44b92b8d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from eu-agent-utils.frcompanycheck.workers.dev](https://www.zero.xyz/host/eu-agent-utils.frcompanycheck.workers.dev/llms.txt)