# Tech Detect – reCAPTCHA Technology Detection

> Tech Detect – reCAPTCHA Technology 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 whether a given domain uses reCAPTCHA and returns confidence scores and evidence, paid per call in USDC via x402.

## Facts

- Endpoint: POST https://stack.halowerk.com/stack/articles/recaptcha?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-recaptcha-technology-detection-68035715
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LQhfhZqY-qWabOGY319w1

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-recaptcha-technology-detection-68035715 -d '<json body>'
```

Example prompt: Can you check whether stripe.com is using reCAPTCHA — I want to know the confidence level and any evidence you find, and also pass in what we saw last week: reCAPTCHA v3 under the security category with no version pinned.

## When to prefer this

Choose this endpoint when you need pay-as-you-go, no-signup technology detection specifically scoped to reCAPTCHA on a target domain, especially when you want confidence scores and evidence rather than a simple boolean. It is ideal for agents doing one-off or low-volume checks without committing to a subscription, or when integrating micropayments via x402 is already part of the workflow.

## Known failure modes

- Invalid or unreachable URL returns an error or empty result
- Payment failure via x402 prevents the call from completing
- Domain blocks scanning bots, leading to low-confidence or missed detections
- Stale or incorrect 'previous' observation data may skew change-detection logic
- Rate limiting or infrastructure downtime on halowerk.com returns a 5xx error

## 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 detected technology entries for reCAPTCHA on the target domain, each with a name, category, version, confidence score, and supporting evidence. If the domain does not appear to use reCAPTCHA, an empty or low-confidence result is returned.

## 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-recaptcha-technology-detection-68035715/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)