# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from onchain-risk.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 (issuer/expiry), and HTTP security header grading for a given domain.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/subdomain-scan?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-domain-osint-tls-certificate-security-8077b463
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q3Nln4ag2lZJdiwq4BgfE

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 onchain-risk-agentdiet-dev-domain-osint-tls-certificate-security-8077b463
```

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

## When to prefer this

Choose this endpoint when you need a single unified OSINT snapshot covering DNS, TLS, and HTTP security posture for any domain without having to stitch together separate DNS lookup, certificate check, and header scanning tools. It is ideal for security due diligence, pre-onboarding vendor checks, monitoring certificate expiry, or competitive reconnaissance on a domain's security configuration.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS result
- TLS certificate absent (HTTP-only domain) — TLS fields may be null or missing
- Domain is unreachable or times out — scan may return partial results
- Invalid domain format provided — API returns validation error
- Rate limiting or payment failure via x402 — HTTP 402 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://onchain-risk.agentdiet.dev/v1/subdomain-scan)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, validity period, expiry date), and an HTTP security header grade indicating the presence and quality of security headers such as HSTS, CSP, and X-Frame-Options for the specified 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/onchain-risk-agentdiet-dev-domain-osint-tls-certificate-security-8077b463/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)