What is the key difference between Captcha MCP and Agntor MCP?

Captcha MCP belongs to the Security category with local stdio execution, while Agntor MCP belongs to the Security category with local stdio execution.

How do I install Captcha MCP or Agntor MCP in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Captcha MCP and Agntor MCP free or paid?

Captcha MCP operates under a Free / Open Source model (No auth required). Agntor MCP operates under a BYOK (Pay Provider Direct) model (API Key required).

Which MCP server has more tools and community activity?

Captcha MCP lists 6 tools with 2 views and 1 GitHub stars. Agntor MCP lists 14 tools with 3 views and 1 GitHub stars.

Can I use both Captcha MCP and Agntor MCP together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Captcha MCP vs Agntor MCP

In-depth architectural comparison of the Captcha MCP and Agntor MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Captcha MCP

Security · Local stdio

Quality: 56/100 (Good) | Auth: No auth required

Agntor MCP

Security · Local stdio

Quality: 55/100 (Good) | Auth: API Key required

Verdict Summary: Choose Captcha MCP if you need specialized Security tools running via a local process. Choose Agntor MCP if your workspace requires Security integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Captcha MCP when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: CAPTCHA_URL, HTTP_MODE, PORT.
Primary tools included: Challenge, verify, and status MCP tools, SHA-256 proof-of-work free tier, L402 Lightning payment support.

Explore Captcha MCP Details

Choose Agntor MCP when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
You have access to required keys: AGNTOR_API_KEY, AGNTOR_MCP_AUTH_KEY, AGNTOR_SECRET_KEY, AGNTOR_API_URL, PORT, MCP_TRANSPORT.

Feature & Specification Comparison

Specification	Captcha MCP zekebuilds-lab Security	Agntor MCP agntor Security
Summary	L402 Lightning paywall + Hashcash proof-of-work gate for MCP tool calls. Free tier solves a PoW challenge; paid tier pays a Lightning invoice via self-hosted LNBits. No accounts, no API keys, no third-party SaaS. Drop-in middleware for any MCP server. npx @powforge/captcha-mcp.	MCP audit server for agent discovery and certification. Provides trust and payment rail for AI agents including identity verification, escrow, settlement, and reputation management.
Category & Scope

Tools & Capabilities Breakdown

Captcha MCP Tools (6)

Challenge, verify, and status MCP tools

SHA-256 proof-of-work free tier

L402 Lightning payment support

Five-minute HMAC-signed access tokens

Stdio and HTTP Streamable transports

Configurable captcha backend URL

Agntor MCP Tools (14)

get_agent_card

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Captcha MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "zekebuilds-lab-captcha-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@powforge/captcha-mcp"
      ],
      "env": {
        "CAPTCHA_URL": "YOUR_CAPTCHA_URL_HERE",
        "HTTP_MODE": "YOUR_HTTP_MODE_HERE",
        "PORT": "YOUR_PORT_HERE"
      }
    }
  }
}

Agntor MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "agntor-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@agntor/mcp"
      ],
      "env": {
        "AGNTOR_API_KEY": "YOUR_AGNTOR_API_KEY_HERE",
        "AGNTOR_MCP_AUTH_KEY": "YOUR_AGNTOR_MCP_AUTH_KEY_HERE",
        "AGNTOR_SECRET_KEY": "YOUR_AGNTOR_SECRET_KEY_HERE",
        "AGNTOR_API_URL": "YOUR_AGNTOR_API_URL_HERE",
        "PORT": "YOUR_PORT_HERE",
        "MCP_TRANSPORT": "YOUR_MCP_TRANSPORT_HERE"
      }
    }
  }
}

Frequently Asked Questions

Captcha MCP is categorized under Security and uses a local stdio subprocess. In contrast, Agntor MCP belongs to Security using local stdio subprocess. Select Captcha MCP when you need capabilities focused on security and Agntor MCP when you require tools for security.

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