# agent402.tools Domain Age & Legitimacy Check

> agent402.tools Domain Age & Legitimacy Check is a paid API for AI agents from agent402.tools, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).

Runs WHOIS registration lookup, DNS resolution, and TLS certificate inspection in a single bundled call to assess how old and legitimate a domain is.

## Facts

- Endpoint: POST https://agent402.tools/api/skill/domain-age
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent402-tools-domain-age-legitimacy-check-25e92f4b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ghpPlvSaIOD2u70KVNjTR

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 agent402-tools-domain-age-legitimacy-check-25e92f4b -d '<json body>'
```

Example prompt: Can you check how old and legitimate the domain 'suspicioussite.net' is — I want to see its WHOIS registration date, DNS resolution, and TLS certificate all in one go?

## When to prefer this

Use this endpoint when you need a comprehensive single-pass assessment of a domain's age and legitimacy, combining WHOIS, DNS, and TLS signals without making three separate API calls. Ideal for phishing detection, vendor vetting, or trust scoring workflows where all three signals are needed together.

## Known failure modes

- Domain not found or unregistered — WHOIS returns no records
- DNS resolution failure for the domain
- TLS certificate absent or expired
- Invalid domain string format in input
- Partial results if one of the three sub-tools (whois, dns-lookup, tls-cert) fails

## How this service works

Bundled execution of the Domain age and legitimacy workflow - How old and legit is this domain? WHOIS registration, DNS resolution, and TLS certificate in one pass. One x402 payment runs 3 underlying tools (whois, dns-lookup, tls-cert); partial-success per step.

## Output

A bundled result containing WHOIS registration data (including domain creation date and registrar), DNS resolution status, and TLS certificate details — giving a composite picture of the domain's age and legitimacy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain to check (e.g. google.com)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "args": {
   "domain": "google.com"
  },
  "pack": "domain-age",
  "steps": [
   {
    "ok": true,
    "slug": "whois",
    "result": {}
   },
   {
    "ok": true,
    "slug": "dns-lookup",
    "result": {}
   },
   {
    "ok": true,
    "slug": "tls-cert",
    "result": {}
   }
  ],
  "summary": "3/3 steps succeeded"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent402-tools-domain-age-legitimacy-check-25e92f4b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)