# Tech Detect — Technology Stack Detection via x402

> Tech Detect — Technology Stack Detection 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 2026-10-13).

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

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/turnstile?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tech-detect-technology-stack-detection-via-x402-178111b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Fs2tg9nrzmnekZDHZZ510

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-technology-stack-detection-via-x402-178111b7 -d '<json body>'
```

Example prompt: Can you detect what technologies are powering stripe.com — I want to know the full stack including frameworks, CDN, analytics tools, and any version info you can find?

## When to prefer this

Choose this endpoint when you need pay-as-you-go technology detection with no signup or API key, especially for sporadic or agent-driven lookups where a subscription would be wasteful. The x402 USDC micropayment model makes it ideal for autonomous agent pipelines. The optional 'previous' snapshot field enables efficient incremental monitoring by comparing against a prior scan. Prefer this over Wappalyzer or BuiltWith APIs when you need crypto-native billing and confidence/evidence metadata per technology hit.

## Known failure modes

- Unresolvable or unreachable domain returns an empty technology list or error
- Heavily obfuscated or server-rendered sites may yield low confidence or missed detections
- Invalid URL format triggers a schema validation error
- Rate limiting or payment failure over x402 results in a 402 Payment Required response
- Some technologies may be detected with low confidence if evidence is ambiguous

## 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 entry including the technology name, category (e.g. CMS, CDN, JavaScript framework, analytics), version if detectable, a confidence score, and supporting evidence. The optional 'previous' field allows incremental scanning so only new or changed technologies are highlighted.

## 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-technology-stack-detection-via-x402-178111b7/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)