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.

x402
Base
Solana
USDC

Listed price: $0.01
Challenge detected: 10 of the last 10 checks
Median response: 105 ms
Last checked: 17 Oct, 09:26 UTC
In our index since: 26 Sept 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.

1 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

POSThttps://hash-hmac.underscoredone.com/hash$0.01Give 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.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 1 of 1 listed endpoints.

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

Recent checks

29 Sept 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.17 Oct 2026

All 10 checks

When (UTC)	Result	HTTP	Response
17 Oct, 09:26 UTC	Challenge detected	402	318ms
16 Oct, 11:31 UTC	Challenge detected	402	117ms
14 Oct, 23:56 UTC	Challenge detected	402	109ms
13 Oct, 14:18 UTC	Challenge detected	402	510ms
11 Oct, 12:57 UTC	Challenge detected	402	78ms
10 Oct, 00:46 UTC	Challenge detected	402	125ms
8 Oct, 21:32 UTC	Challenge detected	402	86ms
7 Oct, 15:42 UTC	Challenge detected	402	97ms
6 Oct, 15:31 UTC	Challenge detected	402	101ms
29 Sept, 05:02 UTC	Challenge detected	402	63ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 09:26 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 26 Sept 2026.

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