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Best pay-per-call whois lookup APIs for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 26, 2026 · 5 agents searched Zero for this in the last 90 days

Zero indexes 10 pay-per-call services for whois lookup: 10 of the 10 ranked here answered a live probe in the last 7 days, quoted from $0.001 to $0.054 per call (median $0.006) over x402 or MPP with no API key; the cheapest live option is WHOIS Lookup at $0.001. The two with real agent usage in the last 30 days are agentsvc.io WHOIS Lookup, agentsvc.io Domain Check. Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

  1. agentsvc.ioagentsvc.io WHOIS Lookup1x402

    Looks up WHOIS registration data for a domain, returning registrar, creation/expiry dates, name servers, and status flags.

    $0.0045/message

    Live · checked Oct 30, 20261 call · 30 days

  2. agentsvc.ioagentsvc.io Domain Check1x402

    Checks a domain's DNS records, WHOIS/RDAP registration details, and email security posture (SPF, DMARC, DKIM) in a single call

    $0.009/message

    Live · checked Oct 30, 20261 call · 30 days

  3. whois.withzero.aiWHOIS Lookup (RDAP)data4.7(1)7mpp

    Look up domain registration details including registrar, creation/expiration dates, name servers, and status using the RDAP protocol.

    $0.001/message

    Live · checked Oct 29, 20260 calls · 30 days

  4. 402utils.com402utils Domain Check (RDAP)5.0(1)2x402

    Checks whether a domain is available or taken using RDAP, returning registration status, registrar, creation/expiry dates, nameservers, and EPP status codes.

    $0.002/message

    Live · checked Oct 27, 20260 calls · 30 days

  5. 2s.io2s.io Domain WHOIS via RDAPx402

    Returns structured WHOIS/RDAP data for a domain including registrar info, registration/expiry dates, nameservers, statuses, and DNSSEC status

    $0.001/message

    Live · checked Oct 30, 20260 calls · 30 days

  6. domain.hugen.tokyodomain.hugen.tokyo WHOIS Lookup1x402

    Returns full WHOIS registration data for any domain — registrar, creation/expiry/update dates, domain age, name servers, DNSSEC status, registrant country/org, and EPP status codes

    $0.01/message

    Live · checked Oct 30, 20260 calls · 30 days

  7. x402-deployer.x402-deployer.workers.devWHOIS / RDAP Domain Lookupx402

    Queries IANA-mandated RDAP to return full domain registration details including age, expiry, registrar, nameservers, DNSSEC status, EPP statuses, risk flags, and optionally certificate-transparency summary.

    $0.02/message

    Live · checked Oct 30, 20260 calls · 30 days

  8. api.strale.ioWHOIS Domain Lookup1x402

    Performs a WHOIS lookup for a given domain, returning registrar details, creation/expiry dates, name servers, registrant info, and raw WHOIS data.

    $0.054001/message

    Live · checked Oct 30, 20260 calls · 30 days

  9. 2s.io2s Domain Intelligence Lookupx402

    Returns DNS records, TLS certificate info, WHOIS registration data, and a health summary for a given domain name

    $0.0048/message

    Live · checked Oct 27, 20260 calls · 30 days

  10. the-stall.intuitek.aiThe Stall — Domain WHOIS Lookupx402

    Performs a WHOIS lookup for a given domain name, returning registration and ownership metadata

    $0.006/message

    Live · checked Oct 30, 20260 calls · 30 days

Call one from an agent

zero fetch --capability agentsvc-io-whois-lookup-578fab64 --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.

Best whois lookup APIs (October 2026) | Zero