MCP MeasureMCP Measure

index observed

captcha.cc Human Verification

Human verification CAPTCHA with visual and selective-listening audio challenges.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
90%
Naming quality
87%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~463Tokens (tool definitions)
~1.1 KBTypical response size
Minimal attention impact (0.36% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "captchacc": {
      "url": "https://captcha.cc/mcp"
    }
  }
}

Remote endpoints

https://captcha.cc/mcpstreamable-http

What it can do

Tool inventory

Tools (3)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢make_widget_snippet(site_key, element_id, form_id, submit_path)

Return a minimal browser SDK snippet for mounting captcha.cc and submitting the proof token to an application endpoint.

Input Schema

{
  "type": "object",
  "properties": {
    "site_key": {
      "type": "string",
      "minLength": 1,
      "description": "Public captcha.cc site key, for example pk_live_xxx."
    },
    "element_id": {
      "default": "captcha",
      "description": "DOM element id where the widget should mount.",
      "type": "string",
      "minLength": 1
    },
    "form_id": {
      "default": "contact-form",
      "description": "Form id to attach submit handling to.",
      "type": "string",
      "minLength": 1
    },
    "submit_path": {
      "default": "/submit-form",
      "description": "Application endpoint that receives the proof token.",
      "type": "string",
      "minLength": 1
    }
  },
  "required": [
    "site_key"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢make_siteverify_request(secret_env_var, proof_token_expression)

Return a server-side fetch example for redeeming a captcha.cc proof token exactly once.

Input Schema

{
  "type": "object",
  "properties": {
    "secret_env_var": {
      "default": "CAPTCHA_CC_SECRET_KEY",
      "type": "string",
      "minLength": 1
    },
    "proof_token_expression": {
      "default": "req.body.proofToken",
      "type": "string",
      "minLength": 1
    }
  },
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟡create_challenge(site_key, hostname)

Create a live captcha.cc challenge for a site key and allowed hostname. Useful for smoke tests and integration checks.

Input Schema

{
  "type": "object",
  "properties": {
    "site_key": {
      "type": "string",
      "minLength": 1,
      "description": "Public captcha.cc site key."
    },
    "hostname": {
      "type": "string",
      "minLength": 1,
      "description": "Hostname configured on the captcha.cc site."
    }
  },
  "required": [
    "site_key",
    "hostname"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Recommended Prompts

retrieve_data
Get details about [item] from captcha.cc Human Verification
Expected tools: make_widget_snippet
fetch_info
Fetch [information type] using captcha.cc Human Verification
Expected tools: make_widget_snippet

Community

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Evidence

Recent observations

verifiedversion not recorded3 tools
verifiedversion not recorded3 tools