X402engine MCP Server

by agentc22io.github.agentc22/x402engine-mcpv1.0.3

50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402

1Node.jsstdioofficial registry

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freshness

Maintained3mo ago

Install X402engine MCP server

claude mcp add x402engine -e X402_DEV_BYPASS='<x402-dev-bypass>' -e X402_PAYMENT_HEADER='<x402-payment-header>' -- npx -y x402engine-mcp

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "<x402-dev-bypass>",
        "X402_PAYMENT_HEADER": "<x402-payment-header>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "<x402-dev-bypass>",
        "X402_PAYMENT_HEADER": "<x402-payment-header>"
      }
    }
  }
}

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

{
  "servers": {
    "x402engine": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "<x402-dev-bypass>",
        "X402_PAYMENT_HEADER": "<x402-payment-header>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "<x402-dev-bypass>",
        "X402_PAYMENT_HEADER": "<x402-payment-header>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
X402_BASE_URL	—	—	Gateway URL (default: https://x402engine.app)
X402_DEV_BYPASS	—	yes	Dev bypass secret to skip payments during testing
X402_PAYMENT_HEADER	—	yes	Pre-signed x402 payment header for automatic payment

Freshness

Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-07-25 · 3mo ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-02-11 · 8mo ago · official registry · v1.0.3

FAQ

›How do I install the X402engine MCP server in Claude Code?

Run: claude mcp add x402engine -e X402_DEV_BYPASS='<x402-dev-bypass>' -e X402_PAYMENT_HEADER='<x402-payment-header>' -- npx -y x402engine-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does X402engine require an API key?

Yes. It expects X402_DEV_BYPASS, X402_PAYMENT_HEADER, of which 2 are secrets.

›Can I use X402engine as a remote (hosted) MCP server?

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

›Is X402engine in the official MCP registry?

Yes, as io.github.agentc22/x402engine-mcp.