{"name":"registrar-lookup","description":"Finds a domain's registrar and related RDAP metadata: registrar name, IANA id, nameservers, DNSSEC, and EPP status codes. Same backend as whois-lookup. Use it as a registrar lookup API or domain registrar finder.","price":"$0.02","method":"POST","input_schema":{"properties":{"domain":{"type":"string","description":"Domain to look up, e.g. 'example.com'. Protocol and www prefix are stripped."},"include_certificates":{"type":"boolean","description":"Optional. If true, also queries crt.sh for TLS certificate history (recent count, first seen). Default false."}},"required":["domain"]},"input_example":{"domain":"example.com"},"output_example":{"domain":"example.com","registrar":{"name":"RESERVED-Internet Assigned Numbers Authority","iana_id":"376"},"nameservers":["A.IANA-SERVERS.NET"]},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}