# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from json-repair.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 target domain.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/cert-transparency?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-domain-osint-tls-certificate-security-38b2e4e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NmML-xsubQn-NK0UozdG-

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 json-repair-agentdiet-dev-domain-osint-tls-certificate-security-38b2e4e6
```

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

## When to prefer this

Choose this endpoint when you need live, real-time OSINT data about a domain's DNS resolution, TLS certificate health, and HTTP security posture in a single call. Ideal for security audits, vendor risk assessments, pre-launch checks, or competitive reconnaissance where you need certificate transparency and security header grading together without stitching together multiple tools.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns an error indicating unresolvable host
- TLS certificate not present or unreachable HTTPS endpoint — cert fields may be null or return connection error
- Rate limiting or payment failure via x402 — returns 402 Payment Required
- Invalid domain format provided — returns validation error
- Target domain blocks automated probes — may return incomplete or timeout responses

## 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://json-repair.agentdiet.dev/v1/cert-transparency)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, chain details), and an HTTP security header grade assessing the presence and quality of headers like HSTS, CSP, X-Frame-Options, etc.

## 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/json-repair-agentdiet-dev-domain-osint-tls-certificate-security-38b2e4e6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)