Japan Corporate Number Check (法人番号 - Houjin Bangou)

Machine Tool Interface · japan-corp-check

$0.01 / callPaid per call · 0 free tier No signup

Validate 13-digit Japanese Corporate Number assigned by the National Tax Agency using Mod-9 check digit algorithm. Required for Japanese B2B SaaS and enterprise billing. Returns signed XDR-1 receipt.

Honest Scope Guarantee

Checksum-verifiable: the 13-digit Corporate Number check digit is verified offline per the National Tax Agency algorithm. Does NOT prove registration in the Houjin Bangou registry.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (Paid-only route — unauthenticated calls return HTTP 402 Payment Required)

curl -X POST https://api.code402.dev/v1/tools/japan-corp-check/call \
  -H "content-type: application/json" \
  -d '{"number":"1180301018771"}'

This route is paid-only (0 free calls/day); every unauthenticated request returns an HTTP 402 Payment Required challenge with its payment terms. Machines use USDC on Base; card credits (instant Stripe checkout) are enabled in this deployment. Signed XDR-1 receipts authenticate recorded service claims, not independent settlement, delivery or zero-knowledge proofs.

Input Parameters

Field	Type	Meaning & Constraints
`number` (REQUIRED)	`string`	13-digit Japanese Corporate Number (e.g. 1180301018771).

Response Format

Deterministic JSON payload fields: tool, valid, normalized, country, reason, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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