kairostamp.com v1 headers

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

answers 402

URL HTTP metadata receipt: server-side fetch of one public http/https URL, returning only transport metadata — HTTP status, final URL, redirect chain, content type and byte length — plus a receipt id. The response body is not returned and no content preview is stored. Single GET query parameter (url).

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

Price: $0.005
Network: base-sepolia
Pay to: 0xdB6F694aE695C632C82677a50593B46137808453
Spec dialect: v2 (declares x402Version 2)
Transport: PAYMENT-REQUIRED header
HTTP method: GET
Response latency: 1761 ms
Payment options: 1 usable of 1
Last checked: 2026-09-06T01:19:27.751Z (26d ago)
Category: finance-crypto

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