# Services from dns.payapi.market on Zero

> dns.payapi.market serves 5 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/dns.payapi.market
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/dns.payapi.market/health.json

## Services

- [DNS Subdomain Discovery API](https://www.zero.xyz/c/dns-subdomain-discovery-api-313fd4fb/llms.txt): $0.002/call via x402. Enumerates subdomains for a given apex domain using Certificate Transparency logs (crt.sh)
- [DNS Intelligence API – SSL Certificate Lookup](https://www.zero.xyz/c/dns-intelligence-api-ssl-certificate-lookup-86820e7a/llms.txt): $0.002/call via x402. Fetches live TLS/SSL certificate details for a domain, including issuer, validity dates, SANs, cipher suite, and days remaining.
- [DNS Reverse-IP Lookup API](https://www.zero.xyz/c/dns-reverse-ip-lookup-api-622ccf9a/llms.txt): $0.002/call via x402. Resolves an IPv4 or IPv6 address to its PTR hostname and discovers other domains hosted on the same IP.
- [DNS Intelligence API](https://www.zero.xyz/c/dns-intelligence-api-72a1e344/llms.txt): $0.002/call via x402. Retrieves comprehensive DNS records (A, AAAA, MX, NS, SOA, TXT, CNAME) for a given domain, along with WHOIS, SSL certificate, subdomain discovery, and reverse-IP data.
- [DNS Intelligence API – WHOIS Lookup](https://www.zero.xyz/c/dns-intelligence-api-whois-lookup-f59ad967/llms.txt): $0.002/call via x402. Returns WHOIS registration data for a given domain, including registrar, creation/expiration dates, name servers, DNSSEC status, and registrant details.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)