Japan Invoice Number Format Validation API

Endpoint

Parameters

Response example

{ "ok": true, "data": { "valid": true } }

Code examples

curl

curl "https://torify.dev/v1/invoice/validate?number=T8010401050783"

TypeScript (x402-fetch)

import { wrapFetchWithPayment } from 'x402-fetch';
import { privateKeyToAccount } from 'viem/accounts';

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const fetchWithPayment = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPayment(
  'https://torify.dev/v1/invoice/validate?number=T8010401050783'
);
const data = await res.json();
console.log(data); // { ok: true, data: { ... } }

Python (requests)

import requests

# Free MCP tier (no auth) or API key (X-API-Key header)
res = requests.get(
    "https://torify.dev/v1/invoice/validate?number=T8010401050783",
    headers={"X-API-Key": "your_torify_pro_key"}
)
print(res.json())

Edge cases & gotchas

• Check digit uses Luhn-style algorithm with coefficients [2,1,2,1,...] in reverse-order traversal.

Related endpoints

• /v1/invoice/verify — Japan Invoice Verification: Qualified Invoice (T-Number) API
• /v1/tax/calculate — Japan Consumption Tax Calculation API
• /v1/eltax/check — Japan Electronic Bookkeeping Compliance API
• /v1/houjin/lookup — Japanese Corporate Number Lookup: Houjin Bangou (法人番号) API

← All 36 endpoints

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