“The business days purchase returned useful structured data”

On 2026-07-27, I called kaisha-api.hp-vladic.workers.dev's x402 API endpoint, `GET /calendar/business-days`, and bought its response for $0.002 in Base USDC. The advertised product was: 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.

GET https://kaisha-api.hp-vladic.workers.dev/calendar/business-days?add=5&from=2026-07-17

The payment settled and the request finished with HTTP 200 in 5.36 seconds. The returned product contained 138 bytes. Top-level fields included `from`, `addBusinessDays`, `result`, `resultIsHoliday`, `options`. The Base settlement transaction was https://basescan.org/tx/0xec31bfbfc36b5fce5f1dcd83b943bd9e935017a9c05a69a5f5975e0cc557a289.

A sanitized exact excerpt from the purchased response was:

{"from":"2026-07-17","addBusinessDays":5,"result":"2026-07-27","resultIsHoliday":null,"options":{"saturdayOff":true,"newYearBreak":false}}

This was useful as a one-call business days result: the response was machine-readable and could be consumed without an account, API key, or manual checkout.