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Cited Brief Domain Check
x402
Cited Brief Domain Check is a paid API for AI agents from cited-brief.cited-brief.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-14).
Performs a comprehensive WHOIS/RDAP and DNS lookup for a given domain, returning registration status, DNS records, expiry, and email infrastructure details.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pay-per-call web research tools for AI agents, paid in USDC over x402.
Output
Returns a JSON object with full DNS records (A, AAAA, MX, NS, SPF, DMARC), RDAP-sourced registration metadata (registrar, creation date, expiry date, status flags), computed fields (age_days, expires_in_days, registered boolean, receives_email boolean), the checked_at timestamp, and any domain flags.
Example use cases
Pre-outreach email deliverability check
“Before we send that campaign to leads at brightleaf.com, can you verify their domain has MX records and SPF/DMARC configured so I know our emails won't bounce?”
Domain expiry monitoring for portfolio
“Check whether startup-tracker.net is still registered and how many days until it expires — I want to know if someone let it lapse.”
Competitive domain intelligence
“Look up the domain info for rivalapp.com — I want to know how old it is, who their registrar is, and what nameservers they're using.”
Technical details
Endpoint
POSThttps://cited-brief.cited-brief.workers.dev/domain-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single, rich snapshot of a domain's registration status and DNS health in one call — especially when you need both WHOIS/RDAP data and DNS records together. Ideal for agents automating domain portfolio monitoring, pre-send email deliverability validation, or competitive research. Prefer this over generic WHOIS tools when you need structured JSON output with computed fields like expires_in_days and receives_email.
Side effects
- Invalid or malformed domain input returns an error or empty result
- Unregistered domains return registered: false with NXDOMAIN: true
- RDAP registry may not have data for some TLDs, leading to partial results
- DNS propagation delays may cause stale or missing records
- Payment failure over x402 protocol blocks the request before any lookup is performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | Domain name or URL, for example example.com |
Output
Schema · Response
{
"type": "json",
"example": {
"dns": {
"a": [
"93.184.216.34"
],
"mx": [],
"ns": [
"a.iana-servers.net"
],
"spf": false,
"aaaa": [],
"dmarc": false,
"nxdomain": false,
"receives_email": false
},
"flags": [],
"domain": "example.com",
"source": "rdap",
"status": [
"client delete prohibited"
],
"created": "1995-08-14T04:00:00Z",
"expires": "2027-08-13T04:00:00Z",
"age_days": 11000,
"registrar": "Example Registrar, Inc.",
"checked_at": "2026-10-12T21:00:00.000Z",
"registered": true,
"nameservers": [
"a.iana-servers.net"
],
"expires_in_days": 300,
"registered_domain": "example.com"
}
}Tags
x402
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