# Northline WebKit – WHOIS/RDAP Domain Lookup

> Northline WebKit – WHOIS/RDAP Domain Lookup is a paid API for AI agents from northline-webkit.northline-c86.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns WHOIS/RDAP registration data for a domain, including creation date, registrar, age, and registration status.

## Facts

- Endpoint: GET https://northline-webkit.northline-c86.workers.dev/v1/domain/whois?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/northline-webkit-whois-rdap-domain-lookup-61490f76
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AHFIspSfZ1mRBOVGyT7Zh

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 northline-webkit-whois-rdap-domain-lookup-61490f76
```

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

## When to prefer this

Choose this endpoint when you need quick, structured WHOIS/RDAP data (registrar, creation date, domain age) without an API key or signup, and are comfortable paying $0.002 USDC per call via x402 on Base. Ideal for AI agents doing automated domain vetting, fraud detection, or competitive research at low cost per query.

## Known failure modes

- Domain not found or unregistered: may return registered=false with minimal data
- Invalid domain format: schema requires minLength of 3 characters
- RDAP/WHOIS registry unreachable: upstream timeout or error
- Rate limiting or payment failure via x402 protocol

## How this service works

Pay-per-call web and domain utilities for AI agents: URL to Markdown, link preview metadata, links, uptime/redirect check, DNS, email-domain check, WHOIS/RDAP, robots.txt and a one-call domain report. x402 (USDC on Base), no API key, no signup.

## Output

Returns a JSON object with the domain name, number of days since registration (ageDays), ISO 8601 creation date (created), registrar name, and a boolean indicating whether the domain is registered.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "minLength": 3,
       "description": "Domain name, 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",
  "ageDays": 11400,
  "created": "1995-08-14T04:00:00Z",
  "registrar": "RESERVED-Internet Assigned Numbers Authority",
  "registered": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/northline-webkit-whois-rdap-domain-lookup-61490f76/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from northline-webkit.northline-c86.workers.dev](https://www.zero.xyz/host/northline-webkit.northline-c86.workers.dev/llms.txt)