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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, and HTTP security header grading for any 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://preflight.agentdiet.dev/v1/osint)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date), and an HTTP security headers grade for the target domain, enabling rapid security posture assessment without active penetration testing.
Example use cases
Pre-integration security due diligence
“Before we integrate with that new payments vendor, can you check their domain paymentsco.io — I want to know their DNS IPs, who issued their SSL cert, when it expires, and how their security headers score?”
Alerting on cert expiry for client sites
“Run an OSINT check on clientportfolio.com and tell me if their TLS certificate is close to expiring and who issued it, so I can flag it before it causes downtime.”
Competitive security posture benchmarking
“Pull the domain OSINT for openai.com — specifically their DNS resolution, TLS certificate details, and HTTP security grade — I want to benchmark it against our own domain's security setup.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/osint?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, passive OSINT snapshot of a domain's DNS, TLS, and HTTP security posture without active exploitation. Ideal for pre-integration vendor security checks, certificate expiry monitoring, or competitive benchmarking. Prefer over manual nslookup/openssl tooling when automating agent-driven security workflows.
Side effects
- Invalid or non-existent domain name — returns error or empty resolution
- Domain with no HTTPS endpoint — TLS certificate fields may be absent
- DNS resolution timeout — network unreachability may cause partial results
- Domain behind CDN or WAF — resolved IPs may reflect CDN infrastructure rather than origin
- Rate limiting or payment failure — HTTP 402 if payment not provided
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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