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WHOIS/RDAP Lookup API
x402
WHOIS/RDAP Lookup API is a paid API for AI agents from rdap-api-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Returns domain registration data (registrar, registrant, dates, nameservers, status) for any domain via the public RDAP protocol, paid per lookup on Base mainnet.
Price / call$0.01
Success—
StatusUnknown
How this service works
Domain registration data via public RDAP protocol. No API key. No account. Pay per lookup on Base mainnet.
Output
Returns structured RDAP data for the queried domain, including registrar name, registration and expiration dates, domain status codes (e.g. clientTransferProhibited), nameservers, and registrant contact information where publicly available. Response follows the RDAP JSON format.
Example use cases
Verify domain ownership before deal
“I'm about to sign a partnership with the company at acmecorp.io — can you look up the RDAP registration data for that domain so I can confirm who actually owns it and when they registered it?”
Monitor domain expiry for competitors
“Check the domain registration record for tesla.com and tell me the expiration date — I want to know how soon it comes up for renewal.”
Security research on suspicious domain
“I got a phishing link pointing to secure-login-paypa1.com — can you run a WHOIS/RDAP lookup on that domain and tell me who registered it, when, and through which registrar?”
Technical details
Endpoint
POSThttps://rdap-api-production.up.railway.app/lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need programmatic, structured RDAP/WHOIS data for a domain without requiring an API key or account sign-up, and you are operating in a context where micropayments on Base mainnet (USDC) are acceptable. It is ideal for agents that need on-demand domain intelligence — ownership verification, expiry monitoring, registrar identification — without pre-negotiating a subscription. Prefer alternatives if you need bulk lookups at scale or if Base mainnet payments are not available in your environment.
Side effects
- Domain not found or not yet registered returns an error or empty RDAP record
- TLDs with no RDAP bootstrap support may fail to resolve
- Rate limits or upstream RDAP server downtime can cause timeouts
- Invalid domain string format returns a validation error
- Payment failure on Base mainnet prevents the lookup from executing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string |
Tags
x402
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