# SiteCheck Web Intel Domain Typosquatting Checker

> SiteCheck Web Intel Domain Typosquatting Checker is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Generates up to 24 lookalike (typosquatting) domain variants for a brand domain and checks which ones have active DNS name servers.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/domain-typosquatting?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-domain-typosquatting-checker-dc4f1a10
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OL3ydoUWsTlHyINtqr32N

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 sitecheck-web-intel-domain-typosquatting-checker-dc4f1a10
```

Example prompt: Can you check which typosquatting or lookalike domains exist for stripe.com — I want to see which letter-swap, letter-omission, or TLD-swap variants have active name servers in DNS right now?

## When to prefer this

Use this endpoint when you need a fast, automated sweep of common typosquatting permutations for a single brand domain and want to know which variants have active DNS infrastructure. It is best suited for brand protection monitoring, pre-launch phishing risk checks, and security audits where a quick DNS-level signal (name servers present or not) is sufficient. Prefer this over full WHOIS or registrar lookups when you need breadth across many variants quickly. Do not use this as a definitive trademark or phishing verdict tool.

## Known failure modes

- Missing required 'domain' query parameter — request fails with validation error
- Invalid or malformed domain string — may produce no useful variants or DNS errors
- DNS resolution timeouts for some variants — those variants may be omitted or marked inconclusive
- All 24 variants return no name servers — empty results list (not an error)
- Rate limiting or upstream DNS resolver unavailability — service error response

## How this service works

For a brand domain, generates up to 24 lookalike names (letter omission, doubling and swapping, plus .co/.net/.org/.io swaps) and checks which ones have name servers in DNS right now. Registered-looking names are listed with their name servers. A lookalike with no name servers may still be registered without DNS, and this is not a trademark or phishing verdict.

## Output

A list of up to 24 generated lookalike domain variants (using letter omission, letter doubling, letter swapping, and TLD substitution for .co/.net/.org/.io). Each variant is reported with its current DNS name servers if any are found. Domains with no name servers are not listed even if registered. The response includes a disclaimer that absence of name servers does not mean unregistered, and a positive result is not a trademark or phishing verdict.

## 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",
       "description": "Brand domain such as github.com (required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-domain-typosquatting-checker-dc4f1a10/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)