kairostamp.com v1 digest

https://kairostamp.com/api/v1/digest

answers 402

URL digest receipt: server-side fetch of one public http/https URL, returning a time-stamped receipt with the HTTP status, final URL, content type, byte length, SHA-256 of the response body, redirect chain, receipt id and tamper-evident hash-chain entry. Single GET query parameter (url). One call performs one fetch; there is no monitoring and no retry.

We sent a real GET request to this endpoint and it answered 402 with payment requirements we could parse.

Price: $0.01
Network: base-sepolia
Pay to: 0xdB6F694aE695C632C82677a50593B46137808453
Spec dialect: v2 (declares x402Version 2)
Transport: PAYMENT-REQUIRED header
HTTP method: GET
Response latency: 1849 ms
Payment options: 1 usable of 1
Last checked: 2026-09-06T01:19:29.021Z (32d ago)
Category: finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fkairostamp.com%2Fapi%2Fv1%2Fdigest"