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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, $0.005/call, status unknown (last checked 2026-10-30).
Returns domain registration data (registrar, registrant, dates, nameservers, status) for a given domain using the public RDAP protocol, paid per lookup via USDC on Base.
Price / call$0.005
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 registration data for the queried domain, including registrar name, registration and expiration dates, domain status flags (e.g. clientTransferProhibited), nameservers, and where available, registrant contact details. Data is sourced from the authoritative public RDAP registry for the domain's TLD.
Example use cases
Domain ownership verification for legal
“I need to verify who owns the domain acme-widgets.com — can you pull the full WHOIS/RDAP record so I can see the registrar, registration date, and current status?”
Expiry monitoring before acquisition
“Check the registration details for mydreamsite.io — specifically when it's set to expire, so I can plan to acquire it when it drops.”
Security investigation of suspicious domain
“We got a phishing report mentioning the domain secure-login-bankverify.net — can you pull its WHOIS/RDAP data so I can see when it was registered and who the registrar is?”
Technical details
Endpoint
POSThttps://rdap-api-production.up.railway.app/check?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need structured, machine-readable domain registration data without managing API keys or accounts, and are comfortable paying $0.005 USDC per lookup on Base mainnet. It is ideal for agents operating in Web3 contexts or x402 payment-enabled workflows. Choose this over traditional WHOIS tools when you need programmatic access with no rate-limit tiers tied to credentials, or when integrating into crypto-native pipelines.
Side effects
- Domain not found / not registered — RDAP returns a 404-equivalent with no record
- Invalid domain format — request rejected due to malformed domain string
- TLD not supported — some ccTLDs may not expose RDAP endpoints
- Rate limiting from upstream RDAP registry — temporary lookup failure
- Payment failure on Base mainnet — call not processed if USDC transfer fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string |
Tags
x402
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