Discover / hash-hmac.underscoredone.com

Hashing, HMAC & Checksum Suite

■ Challenge detected

Give 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.

Listed price
$0.01
Challenge detected
1 of the last check
Median response
535 ms
Last checked
14 Oct, 18:06 UTC
In our index since
14 Oct 2026

Endpoint

curl -i https://hash-hmac.underscoredone.com/hash
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/hash-hmac.underscoredone.com

Recent checks

14 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.14 Oct 2026
All 1 checks
When (UTC)ResultHTTPResponse
14 Oct, 18:06 UTCChallenge detected402535ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 14 Oct, 18:06 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for Hashing, HMAC & Checksum Suite?

Its listed price is $0.01.

What payment terms does Hashing, HMAC & Checksum Suite advertise?

The listing advertises x402, Base, Solana and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is Hashing, HMAC & Checksum Suite listed?

In x402 Bazaar. Superstables first indexed it on 14 Oct 2026.

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