# 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 2026-10-28).

Performs live OSINT on a domain by resolving its IPv4/IPv6 DNS records, inspecting TLS certificate issuer and expiry, and grading its HTTP security headers.

## Facts

- Endpoint: POST https://agentdiet.dev/v1/osint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-0405ae70
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w-4FIVVFVKgHynGdbpirK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-0405ae70 -d '<json body>'
```

Example prompt: Can you run a full domain OSINT check on stripe.com — I want to see its DNS resolution (both IPv4 and IPv6), who issued its TLS certificate, when it expires, and how its HTTP security headers are graded?

## When to prefer this

Choose this endpoint when you need a fast, single-call OSINT snapshot of a domain's DNS, TLS, and security header posture without setting up your own scanning infrastructure. Ideal for due diligence workflows, pre-launch security checks, vendor risk assessments, and monitoring certificate expiry. Prefer this over general web scrapers or manual nslookup/curl workflows when you need structured, machine-readable security intelligence on a live domain.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns resolution failure or empty record set
- Domain has no TLS certificate or uses HTTP only — TLS fields absent or error indicated
- Domain blocks automated probes or returns no security headers — partial or empty header grade
- Invalid domain format provided — returns validation error
- Network timeout reaching the target domain — returns timeout error

## 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/osint)

## Output

Returns live DNS resolution results (IPv4/IPv6 addresses), TLS certificate details (issuer, expiry date, validity status), and an HTTP security headers grade reflecting the domain's security posture.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "minLength": 1,
   "description": "Target domain name (e.g. anthropic.com, openai.com) for DNS, TLS certificate, and security header OSINT"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-0405ae70/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)