    servers/
        communication/
        x402-sms
  

X402 Sms

Unverified Claim & verify → Communication

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

View on GitHub ↗

Overview Installation

Overview

X402 Sms is a Model Context Protocol (MCP) server: Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402. In practice that means any MCP-compatible AI assistant can call X402 Sms's tools directly — the model decides when to use them in a conversation or agent run.

It runs locally: the npm package x402-sms-mcp speaks MCP over stdio on your machine. Configuration happens through environment variables — you'll need BUYER_PRIVATE_KEY. The current release is v0.1.0, with source at UltraStarz/x402-sms-mcp on GitHub.

X402 Sms is listed under Communication on mcp.site and works with any MCP client — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed and the rest of the ecosystem — using the install snippets below. If you maintain X402 Sms for UltraStarz, claim this listing to verify ownership, earn the Verified badge, and keep the details current.

▸npm package — x402-sms-mcp · MCP over stdio

▸Credentials — Requires BUYER_PRIVATE_KEY

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "x402_sms": {
      "command": "npx",
      "args": [
        "-y",
        "x402-sms-mcp"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<buyer-private-key>"
      }
    }
  }
}

Requires BUYER_PRIVATE_KEY