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.
Api EndpointInfrastructureReachable · 76 ms0.01 USDC0.01 USDC · eip155:8453 · USDC0.01 USDC · solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · USDC
https://domain-availability-checker.underscoredone.com/check