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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 email-verify.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 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://email-verify.agentdiet.dev/v1/subdomain-scan)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate details (issuer, expiry date, validity status), and an HTTP security header grade or breakdown indicating which security headers are present or missing.
Example use cases
Pre-acquisition security due diligence
“We're evaluating acquiring techstartup.io — can you pull their DNS records, check their TLS cert issuer and when it expires, and grade their HTTP security headers so I can include it in the due diligence report?”
Monitoring competitor TLS posture
“Run a security recon on our main competitor shopify.com — I want to know their IP addresses, who issued their SSL certificate, how long until it expires, and how their security headers stack up.”
Verifying own domain security before launch
“Before we go live, check our domain myapp.example.com for its DNS resolution, TLS certificate details, and HTTP security header grade so we can catch any misconfigurations.”
Technical details
Endpoint
GEThttps://email-verify.agentdiet.dev/v1/subdomain-scan?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need passive, read-only OSINT on a domain's network and security posture — specifically DNS resolution, TLS certificate metadata, and HTTP security header grading — without triggering active vulnerability scanning. Ideal for due diligence, pre-launch audits, competitor recon, or certificate expiry monitoring. Prefer this over generic WHOIS lookups when you need live TLS and security header data in a single call.
Side effects
- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no HTTPS/TLS — TLS certificate fields may be null or absent
- Firewall or rate-limiting blocks the probe — may return timeout or connection error
- Invalid domain format supplied — returns validation error
- Domain resolves but HTTP request is redirected in an unexpected way — security headers may reflect the redirect target
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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