# 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, returning confidence scores and evidence for each identified technology, billed per call in USDC over x402.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/brevo?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-x402-294eec0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__N2IevEl2tij4DH_2uoGj

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-x402-294eec0d -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need pay-as-you-go technology detection without API key registration, especially when integrating into automated pipelines where per-call USDC billing via x402 is preferred. Ideal for competitive intelligence, sales enrichment, and security research workflows where occasional or high-volume scans of arbitrary domains are needed. The optional 'previous' parameter makes it particularly useful for change-detection workflows.

## Known failure modes

- Domain is unreachable or returns non-200 status — detection may be incomplete or fail entirely
- Private/internal domains with no public fingerprints return empty or low-confidence results
- Heavily obfuscated or custom-built stacks may yield few or no matches
- Invalid URL format returns a validation error
- Payment failure over x402 protocol results in request not being processed

## 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 its name, category (e.g. CMS, analytics, CDN), version if detectable, a confidence score, and supporting evidence for the detection. May also indicate technologies no longer present compared to a previously observed state.

## 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-x402-294eec0d/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)