# Tech Detect — Technology Stack Detection

> Tech Detect — Technology Stack Detection is a paid API for AI agents from stack.halowerk.com, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-13).

Detects the technology stack of up to 3 domains per call, returning confidence scores and evidence for each identified technology.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/monitor?utm_source=zero.xyz
- Price: $0.009/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-25d1e6cc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dogEXqYXg1WY4tSy8leTP

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-25d1e6cc -d '<json body>'
```

Example prompt: What technologies are powering stripe.com and shopify.com right now — I need confidence scores and evidence for every technology you find.

## When to prefer this

Choose this endpoint when you need pay-per-call, no-signup technology fingerprinting for up to 3 domains at once with confidence scores and evidence — ideal for agents doing competitive research, lead enrichment, or change monitoring without a long-term subscription commitment. Prefer it over scraping-based alternatives when structured, categorized tech stack output with confidence levels is needed, and the x402 micropayment model fits your cost structure.

## Known failure modes

- Invalid or non-HTTPS URL format causes rejection per schema pattern constraint
- More than 3 URLs submitted triggers a validation error
- URL is unreachable or returns non-standard responses, resulting in no technologies detected
- Domain exists but has no detectable technology signals (e.g. plain HTML with no fingerprints)
- Previous scan data malformed or missing required fields causes request rejection
- Payment failure over x402 protocol results in 402 response and no scan performed

## How this service works

One bounded batch uses the existing technology detector with a fresh fetch per domain. Reports additions, removals and version changes only when a caller supplies a previous snapshot. First scans have changes=null. Root HTTPS URLs only. Caller snapshots are not authenticated historical evidence. No background jobs, shared history, callbacks or inferred installation dates. Fixed price for a batch of one to three domains.

## Output

Returns a structured list of technologies detected for each submitted domain, including the technology name, category (e.g. CMS, CDN, JavaScript framework, analytics), version (if detectable), a confidence score indicating detection certainty, and supporting evidence for each hit.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "urls": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^https://[a-zA-Z0-9.-]+/?$",
    "maxLength": 2048
   },
   "maxItems": 3,
   "minItems": 1,
   "uniqueItems": true
  },
  "previous": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "url",
     "observed_at",
     "technologies"
    ],
    "properties": {
     "url": {
      "type": "string",
      "maxLength": 2048
     },
     "observed_at": {
      "type": "string",
      "format": "date-time",
      "maxLength": 40
     },
     "technologies": {
      "type": "array",
      "items": {
       "type": "object",
       "required": [
        "name",
        "category",
        "version"
       ],
       "properties": {
        "name": {
         "type": "string",
         "maxLength": 150,
         "minLength": 1
        },
        "version": {
         "type": [
          "string",
          "null"
         ],
         "maxLength": 80
        },
        "category": {
         "type": "string",
         "maxLength": 80,
         "minLength": 1
        }
       },
       "additionalProperties": false
      },
      "maxItems": 150
     }
    },
    "additionalProperties": false
   },
   "maxItems": 3
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tech-detect-technology-stack-detection-25d1e6cc/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)