# 402utils Tech Stack Detector

> 402utils Tech Stack Detector is a paid API for AI agents from 402utils.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Detects a website's technology stack — frameworks, CMS, e-commerce platforms, analytics, CDN, web server, and more — from HTTP headers, cookies, meta tags, and HTML markers using public signature fingerprints.

## Facts

- Endpoint: GET https://402utils.com/v1/tech-detect
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/402utils-tech-stack-detector-4265800c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F6xNfVudpkWRJQAjhlz8T

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 402utils-tech-stack-detector-4265800c
```

Example prompt: Can you figure out what tech stack https://www.shopify.com is running — like what CMS, framework, CDN, analytics tools, and web server they use?

## When to prefer this

Use this endpoint when you need quick, heuristic technology fingerprinting of a public website without requiring access to the licensed Wappalyzer database. It is best for popular, well-known technology stacks where public fingerprints are strong. Prefer it for competitive research, pre-sales intelligence, security assessments, or automated site audits where a per-call micropayment model fits the workflow.

## Known failure modes

- URL fails SSRF safety check (private/internal IP ranges blocked)
- Target site is unreachable or returns error status
- Fetch times out due to cap on response size or latency
- No technologies detected (not-listed does not mean absent)
- Payment not received or insufficient USDC balance
- Invalid or malformed URL provided

## How this service works

Detect a website's tech stack — frameworks, CMS, e-commerce, analytics, tag managers, CDN, web server, language — from response headers, cookies, <meta generator> and HTML/script markers. HEURISTIC, signature-based on PUBLIC fingerprints (NOT the licensed Wappalyzer database): strong on popular tech, conservative elsewhere; not-listed ≠ absent. Each hit carries a confidence and the matched evidence. The URL is SSRF-checked; the fetch is capped.

## Output

Returns a JSON object with the requested URL, final URL after redirects, and an array of detected technologies each containing: name (e.g. 'Next.js'), category (e.g. 'framework'), confidence level ('high'/'medium'/'low'), evidence string showing what matched (e.g. 'html:__NEXT_DATA__', 'header:server=cloudflare'), and optionally a best-effort version. Includes a disclaimer note about heuristic/public-signature scope.

## 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": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "description": "Public http(s) page URL (required)."
      }
     },
     "description": "Query string only."
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "finalUrl",
      "technologies",
      "note"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "The URL as requested."
      },
      "note": {
       "type": "string",
       "description": "Honest scope disclaimer (heuristic, public signatures)."
      },
      "finalUrl": {
       "type": "string",
       "description": "URL after redirects."
      },
      "technologies": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "name",
         "category",
         "confidence",
         "evidence"
        ],
        "properties": {
         "name": {
          "type": "string"
         },
         "version": {
          "type": "string",
          "description": "Best-effort version (from <meta generator>), when available."
         },
         "category": {
          "type": "string",
          "description": "framework, cms, ecommerce, analytics, cdn, web-server, language…"
         },
         "evidence": {
          "type": "string",
          "description": "What matched (e.g. 'html:__NEXT_DATA__', 'header:server=cloudflare')."
         },
         "confidence": {
          "enum": [
           "high",
           "medium",
           "low"
          ],
          "type": "string"
         }
        }
       },
       "description": "Detected technologies, highest confidence first."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/402utils-tech-stack-detector-4265800c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402utils.com](https://www.zero.xyz/host/402utils.com/llms.txt)