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Toll402 French SIREN Validator
x402
Toll402 French SIREN Validator is a paid API for AI agents from toll402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a French SIREN (9-digit business identifier) offline using Luhn checksum verification, with special handling for the La Poste exception.
Price / call$0.001
Success—
StatusUnknown
How this service works
Offline validator for a French SIREN (9-digit business identifier). Normalizes input (strips spaces/dashes), verifies the Luhn checksum (doubling every second digit from the right, summing digits, total divisible by 10), and flags the known La Poste exception (SIREN 356000000) which is a legitimately assigned number.
Output
Returns whether the SIREN is valid or invalid, including normalization (stripping spaces/dashes), the Luhn checksum result, and a flag indicating if the number matches the known La Poste exception (SIREN 356000000).
Example use cases
Pre-submission compliance check
“Before I submit this supplier invoice to our accounting system, can you verify that SIREN 44306184100047 — wait, it's actually 443061841 — is a valid French company SIREN?”
Data quality pipeline for French companies
“I'm cleaning a CSV of French business partners. Can you validate whether SIREN 552 032 534 passes the Luhn check and is a legitimately formatted French identifier?”
Onboarding form validation
“A new user entered 123-456-789 as their French SIREN on our registration form — can you tell me if that's a valid SIREN number?”
Technical details
Endpoint
POSThttps://toll402.dev/v1/t/siren_validateWhen to prefer
Use this endpoint when you need a fast, offline, zero-external-dependency check of whether a French SIREN is syntactically and algorithmically valid. Ideal before calling authoritative French business registries (e.g. INSEE Sirene API) to filter out obviously invalid identifiers and save costs. Prefer this over a full registry lookup when you only need format/checksum validation, not real-time existence or status verification.
Side effects
- SIREN with wrong digit count (not 9 digits after normalization) returns invalid
- Non-numeric characters other than spaces/dashes cause input rejection
- Luhn checksum failure returns invalid even if format is correct
- Network or payment gateway failure returns 402 or 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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