Discover / otp.openverbs.com

HOTP (counter-based)

Not checked

Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400.

x402
Base
USDC

Listed price: $0.004
Challenge detected: 1 of the last check
Median response: 198 ms
Last checked: 14 Oct, 21:21 UTC
In our index since: 14 Oct 2026

Endpoint

curl -i https://otp.openverbs.com/v1/hotp
# 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/otp.openverbs.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)	Result	HTTP	Response
14 Oct, 21:21 UTC	Challenge detected	402	198ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 14 Oct, 21:21 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 HOTP (counter-based)?

Its listed price is $0.004.

What payment terms does HOTP (counter-based) 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 HOTP (counter-based) listed?

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

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