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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 preflight.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 any 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://preflight.agentdiet.dev/v1/cert-transparency)
Output
Returns live DNS resolution data (IPv4/IPv6 addresses), TLS certificate metadata (issuer, validity dates, expiry status), and an HTTP security grade reflecting the presence or absence of security headers such as HSTS, CSP, X-Frame-Options, and similar directives for the queried domain.
Example use cases
Pre-acquisition domain security check
“Before we finalize acquiring that startup, can you run a full domain OSINT check on theirstartup.com — I need to see their TLS cert issuer and expiry, whether they have IPv6, and how their HTTP security headers stack up?”
Monitoring vendor SSL expiry
“Can you check whether the SSL certificate for our payment processor's domain stripe.com is still valid and when it expires? I want to make sure it's not about to lapse.”
Investigating suspicious domain infrastructure
“I got an email from paypa1.com and it looks phishing-y — can you pull the DNS resolution, TLS certificate details, and security header grade on that domain so I can see if it's legit?”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/cert-transparency?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single-call OSINT sweep of a domain's DNS, TLS, and HTTP security posture without setting up infrastructure. Ideal for security reconnaissance, pre-acquisition due diligence, phishing domain investigation, or vendor security validation. Prefer this over manual lookups or separate DNS/SSL tools when you need combined certificate, DNS, and security header data in one response at low cost ($0.01/call).
Side effects
- Domain does not exist or fails DNS resolution — no records returned
- Domain is unreachable or times out during live probing — connection error
- Domain has no TLS certificate (HTTP only) — TLS fields absent or null
- Invalid domain input (e.g. empty string, malformed) — validation error
- Temporary upstream resolution failure — retry may resolve
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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