# 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 2026-10-21).

Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection, and HTTP security header grading for a target domain.

## Facts

- Endpoint: GET https://agentdiet.dev/v1/asn-lookup?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-8030df86
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TfJiR4dvorlPa5tLnVSWW

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-8030df86
```

Example prompt: Can you run a full DNS, TLS certificate, and HTTP security header recon on stripe.com — I want to see the IPv4/IPv6 addresses, who issued the cert and when it expires, and what security grade the headers get?

## When to prefer this

Choose this endpoint when you need a single-call passive recon of a domain's DNS, TLS certificate health, and HTTP security headers without deploying your own scanning infrastructure. It is especially useful for security due diligence, certificate expiry checks, vendor assessments, and lightweight OSINT workflows where you need structured, live data about a domain's security posture at low cost ($0.01/call).

## Known failure modes

- Domain does not exist or is unresolvable — returns DNS resolution failure
- TLS certificate is absent or self-signed — may return incomplete cert data
- Domain blocks HTTP probes — security header analysis may be unavailable
- Invalid domain format provided — returns validation error
- Timeout reaching the target domain — may return partial results

## 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/asn-lookup)

## Output

Returns live DNS resolution results (IPv4/IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade or breakdown for the queried 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/agentdiet-dev-domain-osint-tls-certificate-security-headers-recon-8030df86/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)