Mercury X402 MCP vs HPP x402 MCP Bridge

In-depth architectural comparison of the Mercury X402 MCP and HPP x402 MCP Bridge 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.

Which MCP Server Should You Choose?

Choose Mercury X402 MCP 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 Mercury X402 MCP Details

Choose HPP x402 MCP Bridge 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 HPP x402 MCP Bridge Details

Feature & Specification Comparison

Specification	Mercury X402 MCP Finance & Fintech	HPP x402 MCP Bridge Finance & Fintech
Summary	Agent-payable web data over x402: 18 keyless services an agent pays per call.	MCP bridge for autonomous x402 payments in HPP USDC.e — discover and pay for services per call.
Category & Scope	Finance & Fintech	Finance & Fintech

Tools & Capabilities Breakdown

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).

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

{
  "mcpServers": {
    "hpp-x402-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@hpp-io/x402-mcp-bridge"
      ]
    }
  }
}

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