# Sift Web Tools – WHOIS Domain Lookup

> Sift Web Tools – WHOIS Domain Lookup is a paid API for AI agents from sift.srv1996466.hstgr.cloud, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-23).

Returns WHOIS registration facts for a domain, including registrar, registration date, and domain age in days

## Facts

- Endpoint: GET https://sift.srv1996466.hstgr.cloud/v1/whois?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sift-web-tools-whois-domain-lookup-5c8b7c56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AltGzxd2o4oD1bbteCD0h

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 sift-web-tools-whois-domain-lookup-5c8b7c56
```

Example prompt: Can you look up the WHOIS info for openai.com — I want to know the registrar, when it was registered, and how old the domain is?

## When to prefer this

Use this endpoint when you need quick, structured domain registration facts (registrar, age, registered status) for a single domain in real time — especially useful for trust-scoring unfamiliar domains, OSINT workflows, phishing triage, or vendor vetting. Prefer this over raw WHOIS CLI tools when you need JSON output ready for downstream agent logic. Pay-per-call pricing (charged only on success) makes it cost-effective for sporadic lookups without subscription overhead.

## Known failure modes

- Domain not found or unregistered — may return registered: false with no further details
- Invalid domain format — missing required 'domain' query parameter returns a 4xx error and no charge
- WHOIS data unavailable for certain TLDs with privacy-restricted registries
- Network timeout reaching the WHOIS registry — no charge on non-200 response
- Rate limiting by upstream WHOIS registry may cause intermittent failures

## How this service works

Domain WHOIS via RDAP: registrar, creation and expiry dates, age. Registration data from the official RDAP registry: registrar, status, created, updated, expiry, domain age in days, nameservers, DNSSEC.

## Output

Returns a JSON object with the domain name, whether it is registered, the registrar name, the registration date, and the domain age in days (e.g. {"domain":"example.com","age_days":11000,"registrar":"RESERVED-Internet Assigned Numbers Authority","registered":true}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain, e.g. example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "age_days": 11000,
  "registrar": "RESERVED-Internet Assigned Numbers Authority",
  "registered": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sift-web-tools-whois-domain-lookup-5c8b7c56/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sift.srv1996466.hstgr.cloud](https://www.zero.xyz/host/sift.srv1996466.hstgr.cloud/llms.txt)