# 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 full technology stack of a given domain, returning each identified technology with confidence scores and evidence, billed per call in USDC via x402.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/zendesk-chat?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-x402-7142c0e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CRbve7BGkmf3O0nJGeXVn

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-x402-7142c0e3 -d '<json body>'
```

Example prompt: What's the full technology stack behind shopify.com? I want to know every framework, CMS, analytics tool, and CDN they're using, with confidence scores for each.

## When to prefer this

Choose this endpoint when you need structured, per-technology confidence-scored detection of a domain's stack without signing up for a subscription service. It is ideal for one-off lookups, ad-hoc agent workflows, or pay-as-you-go competitive intelligence pipelines. The optional 'previous' field makes it especially powerful for change detection — pass the prior snapshot and the service can highlight drift. Prefer it over browser-extension tools when you need machine-readable output, and over enterprise solutions when volume is low and signup friction is undesirable.

## Known failure modes

- Domain is unreachable or returns no usable HTTP response — detection returns empty or error
- Domain uses aggressive bot-blocking (Cloudflare, etc.) that prevents scanning — partial or no results
- Payment via x402 fails or wallet has insufficient USDC — request rejected before scanning
- URL exceeds 2048 characters or is malformed — input validation error
- Previous snapshot has more than 150 technologies listed — input rejected due to maxItems constraint

## 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 given domain, each with a name, category (e.g. CMS, CDN, analytics), version where detectable, confidence score, and supporting evidence. May also flag technologies that were previously observed but are no longer present, or new additions since a prior scan.

## 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-x402-7142c0e3/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)