# Toll402 Japan Invoice Number Validator

> Toll402 Japan Invoice Number 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 Japanese invoice registration number (qualified invoice issuer number) and returns its verification status

## Facts

- Endpoint: POST https://toll402.dev/v1/t/invoice_no_jp_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-japan-invoice-number-validator-a1d475b9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_86LOnmTxXsFrb-mRvH1pn

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-japan-invoice-number-validator-a1d475b9 -d '<json body>'
```

Example prompt: Can you check whether the Japanese invoice registration number T7000012050002 is valid and registered under the qualified invoice system?

## When to prefer this

Use this endpoint when you need to programmatically verify Japanese invoice registration numbers (T-numbers) for tax compliance, accounts payable workflows, vendor onboarding, or audit purposes without requiring a separate API key or subscription. Ideal for AI agents handling Japanese business transactions that need pay-per-call validation.

## Known failure modes

- Invalid format — number does not match expected T-prefixed numeric pattern
- Unregistered number — properly formatted but not found in the registry
- Missing required field — value parameter not provided
- Network or upstream registry unavailable — external Japanese tax authority data source unreachable
- Payment failure — insufficient USDC balance for x402 per-call payment

## How this service works

The OpenRouter for AI-agent tools: one gateway, one wallet, every capability. Built-in tools, forged tools, a global verified business directory and 2,000+ aggregated x402 services, all paid per call in USDC via x402 (HTTP 402). No signup, no API key.

## Output

Returns the validation result for the Japanese invoice registration number, including whether the number is valid, properly formatted, and registered under Japan's qualified invoice issuer system (インボイス制度). May include issuer name, registration status, and registration details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "value"
 ],
 "properties": {
  "value": {
   "type": "string",
   "description": "Invoice registration number, e.g. T7000012050002"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toll402-japan-invoice-number-validator-a1d475b9/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)