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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 prompt-guard.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Performs live DNS resolution, TLS certificate inspection, and HTTP security header grading for a given domain name.
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://prompt-guard.agentdiet.dev/v1/whois-lookup)
Output
Returns live DNS resolution results including IPv4 and IPv6 addresses, TLS certificate metadata such as issuer and expiry date, and an HTTP security header audit with a grade or assessment of headers like HSTS, CSP, X-Frame-Options, and related security controls.
Example use cases
Pre-vendor security due diligence
“Before we integrate with acmecorp.com, can you pull their DNS records, check who issued their TLS cert and when it expires, and grade their HTTP security headers so I can include it in the vendor risk report?”
Monitoring certificate expiry for own domain
“Check mycompany.io's TLS certificate right now — I want to know who issued it, when it expires, and whether our security headers like HSTS and CSP are actually showing up correctly.”
Competitive domain security benchmarking
“I want to compare the security posture of stripe.com — can you pull its DNS resolution, TLS cert details, and HTTP security header grade so I can benchmark it?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call passive recon snapshot of a domain covering DNS, TLS, and HTTP security headers in a single call — ideal for vendor due diligence, pre-integration security checks, certificate expiry monitoring, or OSINT pipelines. Prefer this over full port-scanning or active vulnerability scanners when you want non-intrusive, read-only reconnaissance without triggering IDS alerts.
Side effects
- Domain does not exist or cannot be resolved — DNS lookup failure returned
- Domain is unreachable over HTTPS — TLS certificate details unavailable
- Malformed domain input — validation error on the domain parameter
- Domain resolves but drops HTTP connections — security headers cannot be retrieved
- Rate limiting or payment failure — HTTP 402 returned requiring USDC micropayment
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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