# Toll402 SIRET Validator

> Toll402 SIRET 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 SIRET (14-digit establishment identifier) by splitting into SIREN and NIC components and verifying the Luhn checksum offline.

## Facts

- Endpoint: POST https://toll402.dev/v1/t/siret_validate
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toll402-siret-validator-a29ef59d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WunI0ISbHsPguEDzWNRdq

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 toll402-siret-validator-a29ef59d -d '<json body>'
```

Example prompt: Can you check whether this French SIRET number is valid: 73282932000074?

## When to prefer this

Use this endpoint when you need a fast, offline, no-external-dependency check of a French SIRET number's structural validity and Luhn checksum. Ideal for form validation, supplier onboarding pipelines, or data quality audits where you only need format/checksum verification rather than a live registry lookup confirming the business is active.

## Known failure modes

- Invalid SIRET that fails Luhn checksum — returns validation failure with details
- Input shorter or longer than 14 digits after normalization — returns format error
- Non-numeric characters other than spaces present — returns parse or normalization error
- Network or payment failure — HTTP 402 or connectivity error

## How this service works

Offline validator for a French SIRET (14-digit establishment identifier): splits it into SIREN (first 9 digits) and NIC (last 5 digits), normalizes input by stripping spaces, and checks that the full 14-digit string satisfies the Luhn (mod 10) checksum algorithm.

## Output

Returns a validation result indicating whether the SIRET passes the Luhn checksum, along with the parsed SIREN (first 9 digits) and NIC (last 5 digits) components extracted from the normalized input.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "siret"
     ],
     "properties": {
      "siret": {
       "type": "string",
       "description": "14-digit French SIRET, spaces allowed"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toll402-siret-validator-a29ef59d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toll402.dev](https://www.zero.xyz/host/toll402.dev/llms.txt)