# Tech Detect — Web Technology Stack Fingerprinting via x402

> Tech Detect — Web Technology Stack Fingerprinting via x402 is a paid API for AI agents from stack.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-12).

Detects the full technology stack of a given domain URL, returning identified technologies with confidence scores and evidence, billed per call in USDC over x402.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/htmx?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tech-detect-web-technology-stack-fingerprinting-via-x402-c7d5ad35
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kzVky-KDlB6LKn4-Xyhzh

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 tech-detect-web-technology-stack-fingerprinting-via-x402-c7d5ad35 -d '<json body>'
```

Example prompt: What technologies are powering stripe.com? I want confidence scores and evidence for each one detected — framework, CMS, analytics, CDN, everything you can find.

## When to prefer this

Choose this endpoint when you need per-call, no-signup technology fingerprinting with structured confidence scores and evidence, payable in USDC. Ideal for agents that need to scan arbitrary domains on demand without managing API keys. Prefer over bulk/subscription scanning services when call volume is low or unpredictable, and over manual inspection when automation or structured output is required.

## Known failure modes

- URL is unreachable or returns non-200 — scan may fail or return empty results
- Domain has bot-blocking or WAF that prevents fingerprinting — reduced detection coverage
- Malformed URL input — validation error returned
- Payment via x402 fails or is insufficient — request rejected before scan runs
- Site uses heavy obfuscation or custom stack — low confidence scores or no detections

## How this service works

Domain in, technology stack out. Confidence and evidence for every hit. Pay per call in USDC over x402. No signup, no API key.

## Output

Returns a list of detected technologies for the submitted URL, each with a name, category (e.g. JavaScript framework, CDN, CMS), version if detectable, a confidence score, and supporting evidence. May also include metadata about the scan such as observed timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048
  },
  "previous": {
   "type": "object",
   "required": [
    "observed_at",
    "technologies"
   ],
   "properties": {
    "observed_at": {
     "type": "string",
     "maxLength": 40
    },
    "technologies": {
     "type": "array",
     "items": {
      "type": "object",
      "required": [
       "name",
       "category",
       "version"
      ],
      "properties": {
       "name": {
        "type": "string",
        "maxLength": 150
       },
       "version": {
        "type": [
         "string",
         "null"
        ],
        "maxLength": 80
       },
       "category": {
        "type": "string",
        "maxLength": 80
       }
      },
      "additionalProperties": false
     },
     "maxItems": 150
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tech-detect-web-technology-stack-fingerprinting-via-x402-c7d5ad35/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stack.halowerk.com](https://www.zero.xyz/host/stack.halowerk.com/llms.txt)