siren-check
French SIREN (9) / SIRET (14) checksum validation (Luhn, La Poste exception), formatting, NIC, and the derived intra-EU VAT number. Up to 100 numbers. Offline: no register call.
Endpoint
GET|POST https://forge-tools.dentreprise.workers.dev/api/siren-check
Parameters
| Name | Required | Type | Description |
|---|---|---|---|
siren | Required | string | SIREN/SIRET number(s), comma-separated |
Example request (unpaid — expect 402)
curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/siren-check?siren=552032534"
Example 402 challenge
The same object is also sent as a base64 PAYMENT-REQUIRED header. Amounts are atomic USDC units (6 decimals).
{
"x402Version": 2,
"error": "Payment required",
"resource": {
"url": "https://forge-tools.dentreprise.workers.dev/api/siren-check",
"description": "French SIREN (9) / SIRET (14) checksum validation (Luhn, La Poste exception), formatting, NIC, and the derived intra-EU VAT number. Up to 100 numbers. Offline: no register call.",
"mimeType": "application/json"
},
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]
}Retry with payment
curl -sS "https://forge-tools.dentreprise.workers.dev/api/siren-check?siren=552032534" \ -H "PAYMENT-SIGNATURE: $PAYMENT"
Example response
{
"type": "SIREN",
"valid": true,
"vat_number_fr": "FR27552032534"
}Related endpoints
lei-lookup
Legal Entity Identifier lookup from the official GLEIF register: by LEI (with ISO 17442 checksum check) or by legal-name search with optional country.
eori-validate
EORI number validation (customs trader ID) against the official European Commission EOS register, and UK GB numbers against HMRC.
sanctions-check
Sanctions screening of a person, company or vessel name against the US Consolidated Screening List (OFAC SDN with aliases plus other Treasury, Commerce BIS and State lists), the EU consolidated financial sanctions list (FSF), the French national asset-freeze register (DG Trésor) and the UK sanctions list (FCDO).
fr-legal-status
French company legal status by SIREN/SIRET: Sirene administrative status (active/ceased, closure date, legal form, NAF, head office) plus BODACC collective proceedings (sauvegarde, redressement, liquidation judiciaire, clôture) with latest stage, ongoing flag and risk level.