{"service":"Kaisha — Japan Company Registry API","description":"Official-data lookups for Japanese companies, for AI agents — including the only Japan invoice (適格請求書/qualified invoice) registration-number verification on x402, checked against the National Tax Agency dataset. Resolve any Japanese company to its official registry record (corporate number, canonical name, address, active/closed status), plus Japanese business-day and national-holiday utilities. Pay per call with USDC via x402 (Base & Solana) — no API keys, no signup.","payment":{"protocol":"x402","currency":"USDC","networks":[{"network":"eip155:8453","payTo":"0xF2A6416EBb0C594Ab2977695bED061729ddEb47b","chain":"Base"},{"network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","payTo":"6nZQJcTRWm6VQwa7Tg1JBUGjNznviS9fExUHb53TB3GG","chain":"Solana"}]},"endpoints":[{"path":"GET /resolve","price":"$0.005","params":{"q":"Company name (Japanese or romaji) OR 13-digit corporate number","prefecture":"(optional) filter by prefecture, e.g. 東京都","limit":"(optional) max results, default 10, max 25"},"example":"/resolve?q=トヨタ自動車"},{"path":"GET /invoice/verify","price":"$0.01","params":{"number":"Invoice registration number: T + 13 digits (with or without T)"},"example":"/invoice/verify?number=T1234567890123"},{"path":"GET /companies/events","price":"$0.01","params":{"type":"new | renamed | moved | closed | merged | all (default new)","days":"Lookback window 1-60 days (default 7)","prefecture":"(optional) e.g. 東京都","kind":"(optional) entity kind code, 301=株式会社","limit":"(optional) max 200"},"example":"/companies/events?type=new&days=7&prefecture=東京都"},{"path":"GET /calendar/holidays","price":"$0.002","params":{"year":"Year (1955-2027)"},"example":"/calendar/holidays?year=2026"},{"path":"GET /calendar/business-days","price":"$0.002","params":{"from":"YYYY-MM-DD (default today)","add":"(mode A) add N business days → returns resulting date","to":"(mode B) count business days from-to inclusive","saturday_off":"treat Saturday as non-business (default true)","new_year_break":"treat Dec 29 - Jan 3 as non-business (default false)"},"example":"/calendar/business-days?from=2026-07-17&add=5"},{"path":"GET /catalog","price":"free","params":{},"example":"/catalog"}],"dataSources":["National Tax Agency — Corporate Number Publication Site (国税庁法人番号公表サイト)","National Tax Agency — Qualified Invoice Issuer Publication Site (適格請求書発行事業者公表サイト)","Cabinet Office — National Holidays CSV (内閣府)"],"notes":["All data is Japanese-government open data. Individual proprietor names are never returned.","Registry data is refreshed monthly; see checkedAgainst fields for data dates."],"sisterService":"Denpyo — Japan Invoice & Receipt Reader (OCR 請求書/領収書 → JSON + NTA verification): https://denpyo-api.hp-vladic.workers.dev","contact":"hp.vladic@gmail.com"}