domain-availability-checker.underscoredone.com check 100
Updated
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
- Type
- x402 pay-per-call API
- Endpoint
https://domain-availability-checker.underscoredone.com/check- Price
- $0.01 per call on eip155:8453
- Website
- https://domain-availability-checker.underscoredone.com
- Listed on
- x402-bazaar
- Trust / readiness
- 100 / 100 · grade A
- Last checked
- 2026-10-18 · history: 100 → 100
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