# Scout Packs — Subdomain Footprint Lookup

> Scout Packs — Subdomain Footprint Lookup is a paid API for AI agents from scout-packs-production.up.railway.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Returns a list of discovered subdomains for a given domain, along with categorization signals and wildcard detection.

## Facts

- Endpoint: GET https://scout-packs-production.up.railway.app/subdomains?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scout-packs-subdomain-footprint-lookup-00d4fc08
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l_GynAzGL8qDlIqX6joX7

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 scout-packs-subdomain-footprint-lookup-00d4fc08
```

Example prompt: Can you map the subdomain footprint for stripe.com — I want to see all the subdomains they're running and whether there's a wildcard DNS in place?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call subdomain enumeration for a specific domain without setting up an account or API key. It is well-suited for agent-driven B2B research workflows where subdomain intelligence is needed on demand and cost must be kept minimal ($0.02 per call). Prefer this over full DNS scraping tools when you want structured JSON output with categorization and wildcard detection out of the box.

## Known failure modes

- Missing or invalid domain query parameter returns an error
- Domain with no discoverable subdomains returns an empty array
- Wildcard DNS may inflate or obscure real subdomain enumeration results
- Payment failure via x402 prevents data return
- Rate limiting or infrastructure downtime on Railway may cause timeouts

## How this service works

Verified B2B lead packs and per-lead enrichment lookups for agents. $0.01 per lookup or pack (demand probe). USDC on Base via x402. No account, API key, or subscription.

## Output

A JSON object containing the queried domain, an array of discovered subdomains, total count, a wildcard_detected boolean, categorized subdomain groupings, any signals of interest, and a payment receipt confirmation.

## 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 to map the subdomain footprint for (e.g. 'acme.com')."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "count": {
       "type": "number"
      },
      "domain": {
       "type": "string"
      },
      "receipt": {
       "type": "string"
      },
      "signals": {
       "type": "array"
      },
      "categories": {
       "type": "object"
      },
      "subdomains": {
       "type": "array"
      },
      "wildcard_detected": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 3,
  "domain": "acme.com",
  "receipt": "ok",
  "signals": [],
  "categories": {},
  "subdomains": [
   "www.acme.com"
  ],
  "wildcard_detected": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scout-packs-subdomain-footprint-lookup-00d4fc08/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from scout-packs-production.up.railway.app](https://www.zero.xyz/host/scout-packs-production.up.railway.app/llms.txt)