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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 agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer, expiry), and HTTP security header grading for a target 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://agentdiet.dev/v1/whois-lookup)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate details (issuer, validity period, expiry date), and an HTTP security headers grade/analysis for the queried domain.
Example use cases
Vendor security due diligence check
“Before we integrate with this new payment API, can you check the domain security for payments.acmecorp.com — I want to see their TLS certificate details, who issued it, when it expires, and what their HTTP security grade looks like?”
Monitoring certificate expiry for a client
“Can you check when the TLS certificate for mybusiness.com expires and who issued it? I want to make sure it's not about to lapse.”
Investigating a suspicious phishing domain
“I got a suspicious email from support@secure-bank-login.net — can you pull the DNS records, TLS certificate info, and security header grade for that domain so I can tell if it's legit or a phishing site?”
Technical details
Endpoint
GEThttps://agentdiet.dev/v1/whois-lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, combined snapshot of a domain's DNS posture, TLS certificate health, and HTTP security configuration in a single call. It is ideal for security due diligence, OSINT reconnaissance, certificate expiry monitoring, or evaluating third-party vendor domains — especially when you need live, real-time data rather than cached WHOIS registry records.
Side effects
- Domain does not exist or fails DNS resolution — likely returns an error or empty DNS fields
- Domain has no HTTPS/TLS — certificate fields may be null or absent
- Timeout if the target server is slow to respond
- Invalid domain format input — validation error returned
- Domain is reachable but returns no security headers — grade reflects absence
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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