# Company Website Tech Stack Detector

> Company Website Tech Stack Detector is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-01).

Detects the technology stack (CMS, frameworks, analytics, CDN, payments, etc.) used by a company website, with ~70 signatures and evidence per detection.

## Facts

- Endpoint: GET https://freetier-agent-api.pages.dev/api/company-techstack?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/company-website-tech-stack-detector-34f235ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TAsxoUI27NsdnJzEo3x2A

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 company-website-tech-stack-detector-34f235ff
```

Example prompt: What tech stack is stripe.com running? I want to know their CMS, frameworks, analytics tools, CDN, and payment processors — with evidence for each detection.

## When to prefer this

Choose this endpoint when you need structured, categorized technology detection for a specific domain with evidence backing each finding, covering ~70 signatures across CMS, frameworks, analytics, CDN, payments, email, and more. Prefer it over generic web scrapers when you want technology-specific intelligence rather than raw page content, and over manual inspection when you need fast, automated stack detection at scale for competitive analysis, sales enrichment, or due diligence workflows.

## Known failure modes

- Domain not found or unreachable — returns empty results or error
- Private/intranet sites with no public-facing signatures — few or no detections
- Sites with heavy obfuscation or CSP blocking detection — reduced signature matches
- Invalid domain format provided — validation error
- Rate limiting or payment failure (x402) — HTTP 402 or 429 response

## How this service works

Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.

## Output

A JSON object containing the detected domain, a count of technologies found, and technologies grouped by category (e.g. cdn, email, analytics, framework, cms, ecommerce, payments, chat, consent) — each with the specific tool name and supporting evidence such as HTML patterns, HTTP headers, or DNS records.

## 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": "company domain or URL"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 6,
  "domain": "stripe.com",
  "byCategory": {
   "cdn": [
    "Cloudflare"
   ],
   "email": [
    "Google Workspace"
   ],
   "analytics": [
    "Google Tag Manager"
   ],
   "framework": [
    "React"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/company-website-tech-stack-detector-34f235ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from freetier-agent-api.pages.dev](https://www.zero.xyz/host/freetier-agent-api.pages.dev/llms.txt)