# Services from dns-intel-api-production.up.railway.app on Zero

> dns-intel-api-production.up.railway.app 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-intel-api-production.up.railway.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/dns-intel-api-production.up.railway.app/health.json

## Services

- [DNS Reverse Lookup (PTR + Co-hosted Domains)](https://www.zero.xyz/c/dns-reverse-lookup-ptr-co-hosted-domains-b965ee14/llms.txt): $0.002/call via x402. Performs a reverse-DNS lookup for a given IP address, returning its PTR record plus a best-effort list of other domains hosted on the same IP.
- [DNS Intel API – WHOIS Lookup](https://www.zero.xyz/c/dns-intel-api-whois-lookup-d12310de/llms.txt): $0.002/call via x402. Returns WHOIS registration data for a domain including registrar, creation/expiry/updated dates, nameservers, status, DNSSEC, and organisation.
- [DNS Subdomain Enumeration via Certificate Transparency](https://www.zero.xyz/c/dns-subdomain-enumeration-via-certificate-transparency-65a631c1/llms.txt): $0.002/call via x402. Discovers all known subdomains for an apex domain by querying Certificate Transparency logs (crt.sh), returning a de-duplicated, sorted list of up to 1000 results.
- [DNS Full Record Resolver](https://www.zero.xyz/c/dns-full-record-resolver-c97612a4/llms.txt): $0.002/call via x402. Resolves all common DNS record types (A, AAAA, MX, TXT, NS, SOA, CNAME) for a domain in a single API call
- [DNS Intel API – Live TLS Certificate Lookup](https://www.zero.xyz/c/dns-intel-api-live-tls-certificate-lookup-9b435e58/llms.txt): $0.002/call via x402. Fetches the live TLS certificate for a domain by performing a real handshake, returning issuer, subject, validity dates, days remaining, SANs, TLS version, and cipher suite.

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)