Kaisha

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Japan Company Registry API

Official-data lookups for Japanese companies, priced per call via x402 (USDC on Base & Solana). Includes the only Japan qualified-invoice (適格請求書) registration-number verification on x402 — checked against the National Tax Agency dataset. Also: resolve company names / 13-digit corporate numbers to registry records, and compute Japanese business days & national holidays. No API keys — pay per…

Chain infraBaseSolanax402 v2exactkaisha-api.hp-vladic.workers.dev ↗︎

Settled via Coinbase.

Transactions · 30d
34
Volume · 30d
$0.068
Unique buyers · 30d
8
Uptime · 30d
100.0%
Latency p50
197ms
Reported calls · 30d
20

Endpoints (5 live)

  • GET /calendar/holidays — Japanese national holidays for a given year (1955-2027), from the official Cabinet Office dataset. (0.002 USDC on Solana)
  • GET /calendar/business-days — Japanese business-day calculator: check if a date is a business day, add N business days to a date, or count business days in a range. Accounts for weekends and Japanese national holidays; optional Saturday and year-end/new-year rules. (0.002 USDC on Base)
  • GET /invoice/verify — Verifies invoice details and payment status for a given invoice. (0.01 USDC on Solana)
  • GET /resolve — Resolves requests for a paid service on Base and Solana. (0.005 USDC on Base)
  • GET /companies/events — Daily feed of Japanese corporate registry events from National Tax Agency diff data: newly registered companies (新設法人), closures, address changes, renames and mergers. Filter by event type, date range (up to 60 days), prefecture and entity kind. The only x402 API for discovering newly founded Japanese companies — ideal for lead generation, sales prospecting and market monitoring agents. (0.01 USDC on Solana)

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