What is the key difference between Blackwall X402 Guardrail and X402 Middleware?

Blackwall X402 Guardrail belongs to the Finance & Fintech category with local stdio execution, while X402 Middleware belongs to the Finance & Fintech category with local stdio execution.

How do I install Blackwall X402 Guardrail or X402 Middleware 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 Blackwall X402 Guardrail and X402 Middleware free or paid?

Blackwall X402 Guardrail operates under a Free / Open Source model (No auth required). X402 Middleware operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Blackwall X402 Guardrail lists 0 tools with 0 views and 0 GitHub stars. X402 Middleware lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Blackwall X402 Guardrail and X402 Middleware 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.

How do I install Blackwall X402 Guardrail or X402 Middleware in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Blackwall X402 Guardrail and X402 Middleware free to use, or do they require API keys?

Blackwall X402 Guardrail is listed under a Free / Open Source model with No auth required . X402 Middleware operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Blackwall X402 Guardrail and X402 Middleware at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both blackwall-x402-guardrail-2 and x402-middleware as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Blackwall X402 Guardrail has a Quality Score of 37 /100 ( Fair ) with 0 views, 0 installs, and 0 GitHub stars. X402 Middleware holds a Quality Score of 29 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Blackwall X402 Guardrail vs X402 Middleware

In-depth architectural comparison of the Blackwall X402 Guardrail and X402 Middleware 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

Blackwall X402 Guardrail

Finance & Fintech · Local stdio

Quality: 37/100 (Fair) | Auth: No auth required

X402 Middleware

Finance & Fintech · Local stdio

Quality: 29/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose Blackwall X402 Guardrail if you need specialized Finance & Fintech tools running via a local process. Choose X402 Middleware if your workspace requires Finance & Fintech integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Blackwall X402 Guardrail when:

You need dedicated capabilities in the Finance & Fintech domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore Blackwall X402 Guardrail Details

Choose X402 Middleware when:

You need dedicated capabilities in the Finance & Fintech domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore X402 Middleware Details

Feature & Specification Comparison

Specification	B Blackwall X402 Guardrail Finance & Fintech	X X402 Middleware Finance & Fintech
Summary	Pre-signature x402 payment verdict (GO/HOLD/STOP) for AI agents, with a verifiable signed receipt.	One-line x402 + Stripe payment middleware for MCP servers. The Stripe for the agent economy.
Category & Scope	Finance & Fintech	Finance & Fintech
Quality signal

Tools & Capabilities Breakdown

Blackwall X402 Guardrail Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

X402 Middleware Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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).

Blackwall X402 Guardrail Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "blackwall-x402-guardrail-2": {
      "command": "npx",
      "args": [
        "-y",
        "wrangler"
      ]
    }
  }
}

X402 Middleware Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "x402-middleware": {
      "command": "npx",
      "args": [
        "-y",
        "x402-middleware"
      ]
    }
  }
}

Frequently Asked Questions

Blackwall X402 Guardrail is categorized under Finance & Fintech and uses a local stdio subprocess. In contrast, X402 Middleware belongs to Finance & Fintech using local stdio subprocess. Select Blackwall X402 Guardrail when you need capabilities focused on finance & fintech and X402 Middleware when you require tools for finance & fintech.

More alternatives to Blackwall X402 Guardrail More alternatives to X402 Middleware Finance & Fintech category hub