2S MCP Server

by 2s-ioio.github.2s-io/mcpv1.82.0

Pay-per-call x402 API: geocoding, weather, earthquakes, patents, US case law, Federal Register, scientific papers, DNS/WHOIS, OFAC screening and Census data.

8Node.jsstdioofficial registry

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security

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Maintained49d ago

Install 2S MCP server

claude mcp add 2s -e EVM_PRIVATE_KEY='<evm-private-key>' -- npx -y @2sio/mcp

{
  "mcpServers": {
    "2s": {
      "command": "npx",
      "args": [
        "-y",
        "@2sio/mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "2s": {
      "command": "npx",
      "args": [
        "-y",
        "@2sio/mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

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

{
  "servers": {
    "2s": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@2sio/mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "2s": {
      "command": "npx",
      "args": [
        "-y",
        "@2sio/mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<evm-private-key>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
EVM_PRIVATE_KEY	yes	yes	Hex-encoded EVM private key (0x-prefixed) used by the SDK to sign x402 EIP-3009 payment authorizations. Funds USDC on Base.

Freshness

Maintained — last maintenance signal 49d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-08-21 · 49d ago · GitHub
Latest release
2026-08-21 · 49d ago · GitHub · v1.82.0
Package published
no data · npm/PyPI
Registry entry updated
2026-08-21 · 49d ago · official registry · v1.82.0

FAQ

›How do I install the 2S MCP server in Claude Code?

Run: claude mcp add 2s -e EVM_PRIVATE_KEY='<evm-private-key>' -- npx -y @2sio/mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does 2S require an API key?

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

›Can I use 2S as a remote (hosted) MCP server?

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

›Is 2S in the official MCP registry?

Yes, as io.github.2s-io/mcp.