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kairostamp.com v1 change-check
https://kairostamp.com/api/v1/change-check
answers 402
Kairostamp change check: server-side fetch of one public http/https URL, compared against a caller-supplied prior SHA-256 or prior Kairostamp receipt id. Returns whether the response body changed, both digests, and a new time-stamped evidence receipt with its tamper-evident hash-chain entry. One call performs one check; repeat monitoring means calling again.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base-sepolia
- Pay to
- 0xdB6F694aE695C632C82677a50593B46137808453
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 2301 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:17:22.359Z (34d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fkairostamp.com%2Fapi%2Fv1%2Fchange-check"