hash-hmac.underscoredone.com
answeringGive this API any text or binary data and it returns its fingerprint under whichever hash algorithms you choose - SHA-256, SHA-512, MD5, BLAKE2, CRC32 and more. It also signs data with a secret key (HMAC) and safely verifies whether an incoming signature matches, using a timing-safe comparison. Language models cannot hash: they emit a string of the right length and character set that is simply wrong, so every webhook check built on a guessed hash is silently broken.
- Endpoint
- https://hash-hmac.underscoredone.com/hash
- Price
- $0.01 / call
- Settles via
- cdp
- Category
- —
- Last seen live
- Tue, 08 Sep 2026 05:23:37 UTC
- Last probed
- Tue, 08 Sep 2026 05:23:37 UTC
- First indexed
- Tue, 08 Sep 2026 05:22:22 UTC
- Sources
- cdp-x402
Probe history
Last 1 probes, newest on the right. 100% answered with a payment challenge.
| When | Result | Method | Status | Latency |
|---|---|---|---|---|
| Tue, 08 Sep 2026 05:23:37 UTC | challenge | http-402 | 402 | 733 ms |
JSON: /api/v1/services/hash-hmac.underscoredone.com. Own this service? Update the listing.