X402 MCP Bridge MCP Server

by hpp-ioio.github.hpp-io/x402-mcp-bridgev0.1.21

MCP stdio bridge that lets Claude Desktop / OpenClaw / other MCP hosts make x402 payments on HPP — autoTopup from a Safe via AllowanceModule, signs EIP-3009 with a delegate EOA.

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Active8d ago

Install X402 MCP Bridge MCP server

claude mcp add x402-mcp-bridge -e DELEGATE_PRIVATE_KEY='<delegate-private-key>' -- npx -y @hpp-io/x402-mcp-bridge

{
  "mcpServers": {
    "x402-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@hpp-io/x402-mcp-bridge"
      ],
      "env": {
        "DELEGATE_PRIVATE_KEY": "<delegate-private-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "x402-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@hpp-io/x402-mcp-bridge"
      ],
      "env": {
        "DELEGATE_PRIVATE_KEY": "<delegate-private-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "x402-mcp-bridge": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@hpp-io/x402-mcp-bridge"
      ],
      "env": {
        "DELEGATE_PRIVATE_KEY": "<delegate-private-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "x402-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@hpp-io/x402-mcp-bridge"
      ],
      "env": {
        "DELEGATE_PRIVATE_KEY": "<delegate-private-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
DELEGATE_PRIVATE_KEY	—	yes	Delegate EOA private key used to sign payments. Auto-created in the OS keychain if unset.
HPP_NETWORK	—	—	Target network: eip155:181228 (HPP Sepolia, default) or eip155:190415 (HPP Mainnet).
RESOURCE_SERVER_URL	—	—	Optional upstream MCP server to proxy. Omit to expose only the local tools.
SAFE_ADDRESS	—	—	Safe address for governance (Safe) mode. Set together with ALLOWANCE_MODULE_ADDRESS.
ALLOWANCE_MODULE_ADDRESS	—	—	Safe AllowanceModule address for governance (Safe) mode. Set together with SAFE_ADDRESS.

Freshness

Active — last maintenance signal 8d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-02 · 8d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-10-02 · 8d ago · official registry · v0.1.21

FAQ

›How do I install the X402 MCP Bridge MCP server in Claude Code?

Run: claude mcp add x402-mcp-bridge -e DELEGATE_PRIVATE_KEY='<delegate-private-key>' -- npx -y @hpp-io/x402-mcp-bridge. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does X402 MCP Bridge require an API key?

Yes. It expects DELEGATE_PRIVATE_KEY, of which 1 is a secret.

›Can I use X402 MCP Bridge as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is X402 MCP Bridge in the official MCP registry?

Yes, as io.github.hpp-io/x402-mcp-bridge.