# BuiltWith Domain Technology Lookup

> BuiltWith Domain Technology Lookup is a paid API for AI agents from api.builtwith.com, paid per call via x402, $0.0495/call, status healthy (last checked 2026-10-12, last successful call 2026-10-08).

Returns technology stack detections and metadata for a given domain, including frameworks, analytics, hosting, CMS, and other tools detected on the site.

## Facts

- Endpoint: GET https://api.builtwith.com/agent/domain?utm_source=zero.xyz
- Price: $0.0495/call
- Payment: x402
- Status: healthy
- Last checked: 2026-10-12
- Last successful call: 2026-10-08
- Success rate: 100% of calls made through Zero
- Activations on Zero: 2
- Tags: x402
- Canonical page: https://www.zero.xyz/c/builtwith-domain-technology-lookup-42ce933c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XkOMOxYTlpvHwHEjEmZu_

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 builtwith-domain-technology-lookup-42ce933c
```

Example prompt: Can you look up what technologies stripe.com is using — I want to know their CMS, analytics tools, and hosting provider?

## When to prefer this

Use this endpoint when you need detailed, categorized technology stack information for a specific domain — especially for sales qualification, competitive intelligence, or company research workflows. Prefer it over generic web scrapers when you need structured, pre-classified tech detections (e.g. 'uses WordPress', 'uses Google Analytics') rather than raw HTML. The liveOnly flag is useful when you only care about currently active technologies rather than historical detections.

## Known failure modes

- Domain not found or has no detections — returns empty or minimal results
- Invalid domain format (e.g. includes URL path or scheme) — rejected by schema validation
- Insufficient credits or payment failure — 402 or authorization error
- Rate limiting — too many requests in a short period
- Domain is too new or obscure to have BuiltWith coverage — sparse results

## How this service works

BuiltWith API Overview

## Output

A JSON response from BuiltWith containing technology detections for the requested domain — including identified technologies by category (CMS, analytics, hosting, frameworks, advertising, etc.), detection confidence, and associated metadata. Fields vary based on available data for the domain.

## 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",
       "maxLength": 253,
       "minLength": 1,
       "description": "Domain name to research, for example example.com. Do not include a URL path."
      },
      "liveOnly": {
       "type": "boolean",
       "default": false,
       "description": "When true, include only technologies currently detected on the domain."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "description": "BuiltWith API JSON response. Fields vary by capability and available data.",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "Results": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/builtwith-domain-technology-lookup-42ce933c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.builtwith.com](https://www.zero.xyz/host/api.builtwith.com/llms.txt)