Discover / domain-availability-checker.underscoredone.com

Domain Availability Checker

■ Challenge detected

Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured replacement for WHOIS, so there is no free-text parsing. Each domain comes back as 'registered', 'unregistered', or 'indeterminate' when the registry has no RDAP for that ending. 'Unregistered' means no record was found, which usually means available - but reserved and premium names also return no record. Registration status only; no pricing.

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

Endpoint

curl -i https://domain-availability-checker.underscoredone.com/check
# 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/domain-availability-checker.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 detected402843ms

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 Domain Availability Checker?

Its listed price is $0.01.

What payment terms does Domain Availability Checker 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 Domain Availability Checker listed?

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

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