# Tech Detect — Pay-Per-Call Technology Stack Detection

> Tech Detect — Pay-Per-Call 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 2026-10-13).

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

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/php?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-pay-per-call-technology-stack-detection-eda41bd0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_amSJvwun-d8Il6cTeFJE0

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-pay-per-call-technology-stack-detection-eda41bd0 -d '<json body>'
```

Example prompt: Scan https://example.com and tell me what technologies it's running — frameworks, CMS, server software, CDN — with confidence scores for each hit.

## When to prefer this

Choose this endpoint when you need no-signup, pay-as-you-go technology fingerprinting for arbitrary domains without committing to a subscription. It is particularly useful for one-off competitive intelligence, pre-engagement security reconnaissance, or agent workflows that need to enrich domain metadata on demand. The optional `previous` field makes it well-suited for change-detection workflows where you want to diff the current stack against a known baseline.

## Known failure modes

- Domain unreachable or returns non-200 status — detection may be incomplete or empty
- Domain uses heavy bot protection (Cloudflare, etc.) — fingerprinting may be blocked or return partial results
- Invalid or malformed URL input — request rejected
- Payment failure via x402 — call not executed
- Low-confidence detections — some technologies may be listed with low confidence if evidence is sparse

## 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 a name, category (e.g. CMS, JavaScript framework, web server), version (if detectable), confidence score, and supporting evidence. Results reflect the live or near-live state of the target domain at time of call.

## 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-pay-per-call-technology-stack-detection-eda41bd0/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)