# WebLens Tech Detection API

> WebLens Tech Detection API is a paid API for AI agents from api.weblens.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Detects technologies, frameworks, hosting providers, and other tech stack components used by a given URL

## Facts

- Endpoint: POST https://api.weblens.dev/tech?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/weblens-tech-detection-api-86028d6e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b8bFJGJrCBEllqkfF07Pv

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 weblens-tech-detection-api-86028d6e -d '<json body>'
```

Example prompt: Can you detect what technologies and frameworks are powering vercel.com — I want to know the hosting provider, frontend framework, and any other stack components you can identify?

## When to prefer this

Choose this endpoint when you need to fingerprint the technology stack of a specific URL without setting up an account or committing to a monthly plan. It is ideal for per-call, pay-as-you-go tech detection where cost efficiency matters — at $0.005 per call (with 70% discount on cached results), it undercuts comparable services. Prefer it for competitive research, lead enrichment, or developer due diligence workflows where you need structured, categorized technology evidence including header-based fingerprints.

## Known failure modes

- URL is unreachable or returns a non-2xx status — endpoint still returns status code but technology detection may be incomplete
- Site uses heavy client-side rendering that prevents server-side technology fingerprinting
- Redirect loops or very long redirect chains may affect finalUrl resolution
- Payment failure via x402 protocol if insufficient USDC balance
- Invalid or malformed URL input returns an error response

## How this service works

# WebLens - Web Intelligence API, pay per call

Scrape, crawl, map and extract the web. No account, no API key, no monthly
minimum — you pay for the calls you make and nothing else.

## Pricing
Page fetching starts at **$0.002**, whole-site crawling at
**$0.0015/page**, and sitemap discovery at **$0.004**.
Comparable services bill $0.007-0.008 per request, or reach a lower per-page
rate only on a $99/month commitment. WebLens has no commitment to reach.

## Payment Protocol
All paid endpoints use the [x402 protocol](https://x402.org) for HTTP-native
micropayments (USDC on Base).

## Cache Discount
Cached responses are **70% cheaper** than fresh fetches.

## Output

Returns a JSON object containing the detected technologies (each with name, category, and header/DOM evidence), a categorized map of technologies by type (e.g. hosting, framework), server and powered-by header values, final redirected URL, HTTP status code, and a request ID for tracing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Site URL to fingerprint"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://vercel.com",
  "server": "Vercel",
  "status": 200,
  "finalUrl": "https://vercel.com/",
  "poweredBy": "Next.js, Payload",
  "requestId": "req_tech123",
  "categories": {
   "hosting": [
    "Vercel"
   ],
   "framework": [
    "Next.js"
   ]
  },
  "detectedAt": "2026-08-02T12:00:00.000Z",
  "technologies": [
   {
    "name": "Next.js",
    "category": "framework",
    "evidence": "header x-powered-by: Next.js, Payload"
   },
   {
    "name": "Vercel",
    "category": "hosting",
    "evidence": "header x-vercel-id: ..."
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/weblens-tech-detection-api-86028d6e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.weblens.dev](https://www.zero.xyz/host/api.weblens.dev/llms.txt)