# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from defi-yield.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Performs live reconnaissance on a domain, returning IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry details, and HTTP security header grades.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/osint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-bafdde09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Bha64EBY8FrV1KHIzYXlV

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 defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-bafdde09
```

Example prompt: Run a full DNS, TLS certificate, and HTTP security headers check on anthropic.com — I want to see the IPv4/IPv6 resolution, who issued the cert and when it expires, and what security grade the site gets.

## When to prefer this

Choose this endpoint when you need a quick, live, all-in-one recon snapshot of a domain's DNS posture, TLS certificate health, and HTTP security configuration without standing up your own scanning infrastructure. It is ideal for security audits, vendor due diligence, phishing investigation, certificate expiry alerting, or any workflow requiring passive domain reconnaissance at $0.01 per call.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no HTTPS endpoint — TLS certificate details unavailable
- Target server times out during HTTP header inspection — partial or missing security grade
- Invalid domain format provided — validation error returned
- Domain resolves but blocks automated probes — headers may be incomplete

## 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://defi-yield.agentdiet.dev/v1/osint)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiry date, and an HTTP security headers grade reflecting which security headers are present and correctly configured on the target domain.

## 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/defi-yield-agentdiet-dev-domain-osint-tls-certificate-security-bafdde09/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)