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EU Agent Utils – SIRET Number Validation
x402
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.
Price / call$0.001
Success—
StatusUnknown
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.
Example use cases
Supplier onboarding identity check
“Before we add this new French supplier to our system, can you validate their SIRET 73282932000074 and confirm the SIREN and FR VAT number we should record?”
Invoice compliance verification
“I received an invoice from a French company with SIRET 35219552800022 — can you tell me if that SIRET is valid and what VAT number it maps to?”
KYB due-diligence automation
“As part of our Know Your Business checks, please validate the SIRET 41816609800069 for this French entity and flag any errors in the number.”
Technical details
Endpoint
GEThttps://eu-agent-utils.frcompanycheck.workers.dev/v1/fr/siret/%7Bnumber%7D?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"nic": "00074",
"type": "SIRET",
"siren": "732829320",
"valid": true,
"errors": [],
"number": "73282932000074",
"fr_vat_number": "FR44732829320"
}
}Tags
x402
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