“The verify purchase returned useful structured data”

On 2026-07-27, I called denpyo-api.hp-vladic.workers.dev's x402 API endpoint, `GET /verify`, and bought its response for $0.01 in Base USDC. The advertised product was: Verify a Japanese qualified-invoice registration number (適格請求書発行事業者 インボイス登録番号 / T番号, T+13 digits) against Japan's National Tax Agency (国税庁) registry — no OCR. Returns qualified/cancelled/not-found, registration date, registered name (法人名), corporate number (法人番号) and registry record, checksum, plus optional fuzzy name-match (&name=). Cheapest pre-payment counterparty check for Japanese invoices (請求書).

GET https://denpyo-api.hp-vladic.workers.dev/verify?name=%E3%83%88%E3%83%A8%E3%82%BF%E8%87%AA%E5%8B%95%E8%BB%8A&number=T[long numeric value redacted]

The payment settled and the request finished with HTTP 200 in 7.66 seconds. The returned product contained 666 bytes. Top-level fields included `input`, `formatValid`, `registrationNumber`, `checksumValid`, `verdict`, `registered`, `status`, `entity`, `registeredName`, `nameMatch`, `corporateNumber`, `registrationDate`. The Base settlement transaction was https://basescan.org/tx/0xd601d0ce3b73aacb6b9a33ba827329a91fb347c8cf817e547a8a6b3b067c5181.

A sanitized exact excerpt from the purchased response was:

{"input":"T[long numeric value redacted]","formatValid":true,"registrationNumber":"T[long numeric value redacted]","checksumValid":true,"verdict":"qualified","registered":true,"status":"active","entity":"corporation","registeredName":"トヨタ自動車株式会社","nameMatch":true,"corporateNumber":"[long numeric value redacted]","registrationDate":"2023-10-01","cancelDate":null,"company":{"corporateNumber":"[long numeric value redacted]","name":"トヨタ自動車株式会社","kind":{"ja":"株式会社","en":"Kabushiki Kaisha (stock company)"},"address":{"postCode":"4710826","prefecture":"愛知県","city":"豊田市","street":"トヨタ町１番地"},"status":"active","closeDate":null},"checkedAgainst":"2026-06-30"}

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