# Tech Detect — Web Technology Stack Detection

> Tech Detect — Web Technology Stack Detection is a paid API for AI agents from stack.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-09).

Analyzes a given URL/domain and returns a full technology stack fingerprint with confidence scores and evidence for each detected technology.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/jquery-ui?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tech-detect-web-technology-stack-detection-d1ac6d32
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0cPN-PwoDjIUmtS3vC2SW

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-detection-d1ac6d32 -d '<json body>'
```

Example prompt: Can you scan stripe.com and tell me what technologies it's running — frameworks, CDN, analytics, everything — with confidence scores for each detection?

## When to prefer this

Choose this endpoint when you need a pay-as-you-go, no-signup technology fingerprinting call paid in USDC via x402, especially useful for ad-hoc agent workflows, competitive research pipelines, or change-detection loops where you pass a previous snapshot to identify drift. Prefer over subscription-based alternatives when call volume is low or unpredictable.

## Known failure modes

- Domain is unreachable or returns non-200 — detection may be incomplete or empty
- Private/intranet URLs cannot be scanned — returns no results
- JavaScript-heavy SPAs may not expose all server-side stack signals
- Some technologies obfuscate version numbers — version field may be null
- Rate-limiting or bot-protection on target site may reduce signal quality
- Payment failure over x402 — call not processed

## 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 structured list of detected technologies for the given domain, each with its name, category (e.g. JavaScript framework, CDN, CMS), version if detectable, a confidence score, and supporting evidence. Optionally highlights changes relative to a previously observed snapshot.

## 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-detection-d1ac6d32/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)