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Domain OSINT, TLS Certificate & Security Headers Recon
Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).
Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer, expiry), and HTTP security header grading for a given domain.
Price / call$0.01
Success—
StatusUnknown
How this service works
Inspects live IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry, and HTTP security grade. (Live x402 v2, IETF MPP & MCP endpoint at https://serp-extract.agentdiet.dev/v1/whois-lookup)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security headers analysis including presence/absence of headers like HSTS, CSP, X-Frame-Options, and an overall security grade for the domain.
Example use cases
Pre-vendor security due diligence
“Before we integrate with acme-payments.io, can you pull their DNS records, check who issued their TLS cert and when it expires, and give me their HTTP security headers grade?”
Monitor competitor infrastructure posture
“I want to know the TLS certificate details and security header grade for competitor.com — who issued their cert, when does it expire, and are they missing any critical headers like HSTS or CSP?”
Investigate suspicious phishing domain
“There's a suspicious domain called secure-login-mybank.net going around — can you check its IPv4/IPv6 DNS resolution and TLS certificate issuer to see if it looks legitimate or spoofed?”
Technical details
Endpoint
POSThttps://serp-extract.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, real-time DNS and TLS certificate data combined with HTTP security header analysis in a single call. It is ideal for security reconnaissance, vendor due diligence, phishing domain investigation, or monitoring the security posture of any publicly accessible domain. Prefer this over generic WHOIS services when you specifically need TLS certificate issuer/expiry and security header grading alongside DNS resolution.
Side effects
- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- TLS handshake fails or domain has no HTTPS — certificate fields may be null or errored
- Domain is unreachable/offline — live inspection cannot complete
- Invalid domain format input — returns validation error
- Rate limiting or upstream connectivity issues — may return timeout or partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string | Target domain name (e.g. anthropic.com, openai.com) for DNS, TLS certificate, and security header OSINT |
Output
Schema · Response
{
"type": "object"
}Reviews
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