# 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).

Inspects a domain's live DNS resolution (IPv4/IPv6), TLS certificate issuer/expiry, and HTTP security header grade in a single call.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/ssl-audit?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-3fcc3d66
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w4MskQRXDbZ1iVgk2Z5oN

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-3fcc3d66
```

Example prompt: Can you run a full domain OSINT check on stripe.com — I want to see its DNS IPs, TLS certificate issuer and expiry date, and how its HTTP security headers score?

## When to prefer this

Choose this endpoint when you need a combined, single-call snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header configuration for OSINT, vendor risk assessment, or security auditing purposes. It is especially useful when you want to avoid stitching together separate DNS lookup, certificate checker, and security header scanner tools.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error indicating unresolvable domain
- Domain has no TLS/HTTPS — certificate fields may be null or absent
- Network timeout reaching the target domain — returns connectivity error
- Invalid domain format supplied — returns schema validation error
- Domain is behind a firewall that blocks probes — incomplete or partial results returned

## 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/ssl-audit)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata including issuer and expiration date, and an HTTP security header audit with an overall security grade for 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-3fcc3d66/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)