# Tech Detect — Website Technology Stack Fingerprinter

> Tech Detect — Website Technology Stack Fingerprinter 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/URL, returning each detected technology with confidence score and supporting evidence, via pay-per-call x402 micropayment.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/cloudflare?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-website-technology-stack-fingerprinter-d2691965
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q14ZEsSPPXQV2BNDnizH4

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-website-technology-stack-fingerprinter-d2691965 -d '<json body>'
```

Example prompt: Can you scan stripe.com and tell me every technology it's running — frameworks, CDN, analytics, CMS — with confidence scores and evidence for each hit?

## When to prefer this

Choose this endpoint when you need structured, confidence-weighted technology fingerprinting of a specific domain without managing API keys or subscriptions — particularly suited for AI agents that need on-demand, pay-per-call stack detection as part of automated enrichment pipelines, competitive research workflows, or sales prospecting. The optional `previous` parameter makes it ideal for change-detection use cases where you want to diff the current stack against a prior observation.

## Known failure modes

- Domain unreachable or non-existent — returns empty results or error
- Heavily obfuscated or minimal sites may yield low-confidence or sparse results
- Rate limits or blocking by the target domain may degrade detection quality
- Invalid URL format in input results in validation error
- Payment failure via x402 protocol prevents the call from executing

## How this service works

Purpose-bound Cloudflare observation (cdn) using the existing fresh Stack-Monitor. Returns stack_cloudflare_decision, direct versus inferred status, evidence, optional version difference against a caller-owned baseline and reusable snapshot. Missing fingerprints do not prove absence. No background scheduling, CVE, compatibility or installed-extension inventory. Existing outbound safeguards remain in the injected motor. One public HTTPS root domain, up to150 baseline technologies; 9s timeout.

## Output

Returns a structured list of detected technologies for the given URL. Each entry includes the technology name, its category (e.g. CDN, CMS, JavaScript Framework), detected version (or null if unknown), a confidence score, and the evidence or signals that triggered the detection. The response enables complete stack profiling of any public-facing domain.

## 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-website-technology-stack-fingerprinter-d2691965/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)