Discover / hash.openverbs.com

HMAC data

■ Challenge detected

Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, etc.) and API requests. Data and key may each be utf8/hex/base64/base64url; the tag is returned as hex/base64/base64url.

x402
Base
USDC

Listed price: $0.002
Challenge detected: 10 of the last 10 checks
Median response: 181 ms
Last checked: 17 Oct, 08:59 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://hash.openverbs.com/v1/hmac
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

2 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.

Base URLhttps://hash.openverbs.com/v1

POST/hash$0.002Compute a cryptographic digest (SHA-2, SHA-3, BLAKE2, and legacy SHA-1/MD5/RIPEMD-160) of some data. The input may be utf8/hex/base64/base64url and the digest is returned as hex/base64/base64url.
POST/hmac$0.002Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, etc.) and API requests. Data and key may each be utf8/hex/base64/base64url; the tag is returned as hex/base64/base64url.

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

Showing 2 of 2 listed endpoints.

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

Recent checks

28 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, 08:59 UTC	Challenge detected	402	507ms
16 Oct, 08:13 UTC	Challenge detected	402	174ms
14 Oct, 21:46 UTC	Challenge detected	402	177ms
13 Oct, 10:39 UTC	Challenge detected	402	272ms
11 Oct, 10:02 UTC	Challenge detected	402	212ms
10 Oct, 00:46 UTC	Challenge detected	402	178ms
8 Oct, 21:32 UTC	Challenge detected	402	264ms
7 Oct, 15:42 UTC	Challenge detected	402	183ms
6 Oct, 15:31 UTC	Challenge detected	402	171ms
28 Sept, 17:02 UTC	Challenge detected	402	172ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 08:59 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 HMAC data?

Its listed price is $0.002.

What payment terms does HMAC data advertise?

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

Where is HMAC data listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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