# agent402.tools Tech Stack Detector

> agent402.tools Tech Stack Detector is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13, last successful call 2026-07-10).

Detects the technology stack of a public website, including CDN, web server, runtime, frontend framework, CMS, and analytics tools

## Facts

- Endpoint: POST https://agent402.tools/api/tech-stack
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Last successful call: 2026-07-10
- Success rate: 100% of calls made through Zero
- Activations on Zero: 3
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent402-tools-tech-stack-detector-e8e772e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IWOu27eJACNiyNPyONG8b

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 agent402-tools-tech-stack-detector-e8e772e1 -d '<json body>'
```

Example prompt: What tech stack is https://linear.app running on? I want to know their CDN, frontend framework, CMS if any, and analytics setup.

## When to prefer this

Use this endpoint when you need to identify the technology stack of any public website without manual inspection. Ideal for competitive research, due diligence, lead qualification, or developer tooling where knowing the CMS, framework, or CDN is required. Prefer over manual Wappalyzer-style inspection when you need structured JSON output programmatically.

## Known failure modes

- URL is not publicly reachable or returns non-2xx — detection may fail or return partial results
- Private/intranet URLs cannot be fingerprinted
- Some technologies may not be detectable if obfuscated or server-side only
- Malformed URL input returns validation error

## How this service works

Detect the technology stack of a public website: CDN, web server, language/runtime, frontend framework (Next.js, Nuxt, SvelteKit, Remix, Astro, React, Vue, Angular), CMS (WordPress, Drupal, Ghost, Shopify, Wix, Squarespace, Webflow), analytics (GA, GTM, PostHog, Mixpanel, Segment, Hotjar, Plausible, Fathom), and payments (Stripe, PayPal). Signature-based; no third-party API.

## Output

Returns a structured breakdown of the detected technologies for the given URL, including CDN provider, web server, programming language/runtime, frontend framework (e.g. Next.js, React, Vue, SvelteKit), CMS (e.g. WordPress, Shopify, Webflow), and analytics tools (e.g. Google Analytics).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http(s) URL to fingerprint"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/",
  "server": "nginx",
  "detected": [
   {
    "name": "nginx",
    "category": "server"
   }
  ],
  "fetchedAt": "2026-06-19T22:00:00.000Z",
  "generator": null,
  "poweredBy": null,
  "byCategory": {
   "server": [
    "nginx"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent402-tools-tech-stack-detector-e8e772e1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)