X402 Sms MCP Server

by ultrastarzio.github.UltraStarz/x402-smsv0.1.0

Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.

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Active4d ago

Install X402 Sms MCP server

claude mcp add x402-sms -e BUYER_PRIVATE_KEY='<buyer-private-key>' -- npx -y x402-sms-mcp

{
  "mcpServers": {
    "x402-sms": {
      "command": "npx",
      "args": [
        "-y",
        "x402-sms-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "x402-sms": {
      "command": "npx",
      "args": [
        "-y",
        "x402-sms-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "servers": {
    "x402-sms": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-sms-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "x402-sms": {
      "command": "npx",
      "args": [
        "-y",
        "x402-sms-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
BUYER_PRIVATE_KEY	yes	yes	Ethereum private key for the buyer wallet that pays the per-call USDC fee.

Freshness

Active — last maintenance signal 4d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-06 · 4d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-05-15 · 5mo ago · official registry · v0.1.0

FAQ

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

Run: claude mcp add x402-sms -e BUYER_PRIVATE_KEY='<buyer-private-key>' -- npx -y x402-sms-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does X402 Sms require an API key?

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

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

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

›Is X402 Sms in the official MCP registry?

Yes, as io.github.UltraStarz/x402-sms.