JP Qualified Invoice API

JP Qualified Invoice API — Japan 適格請求書 validation: 国税庁 T-number registry check + consumption-tax math.

What you get

• POST /v1/invoice/validate — primary endpoint.
• X-API-Key authentication, per-key rate limits, audit log.
• OpenRouter-backed where AI is involved — no model keys to manage on your side.
• Interactive Swagger docs at api-jp-invoice.knowlez.com/docs.

Plans

• Starter — $9/mo · 50 invoices included · $0.05/invoice overage.
• Pro — $29/mo · 500 invoices included · $0.04/invoice overage.