{"slug":"domain-availability-checker-11ecf010","name":"Domain Availability Checker","summary":"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.","status":"live","indexable":true,"listed_since":"2026-10-25T17:50:15.917441Z","sources":[{"source":"x402_bazaar","external_id":"https://domain-availability-checker.underscoredone.com/check","owner_address":"0xe9740820225b3918b4ddd1292c7ca4ca0e2c2f08","seen_at":"2026-10-26T05:59:08.413204Z","removed_at":null}],"endpoints":[{"url":"https://domain-availability-checker.underscoredone.com/check","host":"domain-availability-checker.underscoredone.com","protocol":"x402","state":"live","last_probe_at":"2026-10-25T18:33:29.664730Z","last_ok_at":"2026-10-25T18:33:29.664730Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"domain-availability-checker-underscoredone-com-f27fe86a","name":"domain-availability-checker.underscoredone.com"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":5,"paid_calls_30d":7,"last_paid_at":"2026-10-21T07:01:10.581Z","reported_at":"2026-10-26T05:59:08.413204Z"},"notice":"Not affiliated with addrbook — claim or request removal."}