# shelf.thirdmade.net CAPTCHA Classifier

> shelf.thirdmade.net CAPTCHA Classifier is a paid API for AI agents from shelf.thirdmade.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Identifies the type and difficulty of a CAPTCHA on a given page (reCAPTCHA, hCaptcha, Turnstile, image, slider, puzzle) — evaluation only, no solving.

## Facts

- Endpoint: GET https://shelf.thirdmade.net/probe/captcha-eval
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/shelf-thirdmade-net-captcha-classifier-e1e8b5a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qqs10AR_Xg52x4jG_59f6

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 shelf-thirdmade-net-captcha-classifier-e1e8b5a9
```

Example prompt: Can you check what type of captcha is on this login page — is it reCAPTCHA, hCaptcha, Turnstile, or something else, and how hard is it?

## When to prefer this

Use this endpoint when you need to fingerprint what kind of bot protection a site uses before building automation, selecting a bypass strategy, or auditing a set of domains for CAPTCHA diversity. It is purely evaluative — choose it when you need classification metadata, not solving capability.

## Known failure modes

- No captcha detected on the page — returns null or unknown type
- Target page is unreachable or returns non-200 status
- Captcha type is novel or obfuscated and cannot be classified
- Query param 'type' enum value is unrecognized or misspelled
- Rate limiting or payment failure returns 402 error

## How this service works

Classifies captcha type (reCAPTCHA, hCaptcha, Turnstile) and difficulty. Eval only — we do NOT solve captchas.

## Output

Returns the detected captcha type (one of: recaptcha, hcaptcha, turnstile, image, slider, puzzle) and a difficulty rating for the challenge found on the probed page.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "type": {
       "type": "string",
       "description": "Captcha type: recaptcha, hcaptcha, turnstile, image, slider, puzzle"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shelf-thirdmade-net-captcha-classifier-e1e8b5a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shelf.thirdmade.net](https://www.zero.xyz/host/shelf.thirdmade.net/llms.txt)