x402 Wallet

x402 Wallet is a local MCP server: Self-custodial x402 wallet for AI agents: pay any service in USDC or $THREE from your own key. Install it from npm as @three-ws/x402-mcp.

Claude CodeCodexAntigravity

commandprompt

Terminal

claude mcp add io-github-nirholas-x402-mcp -e SOLANA_SECRET_KEY=... -e SOLANA_RPC_URL=... -e MAX_PAY_USD=... -e REQUIRE_CONFIRM=... -e THREE_WS_BASE=... -- npx -y @three-ws/x402-mcp

Run in your project folder. Add --scope user to use it everywhere.

Add to claude_desktop_config.json or .cursor/mcp.json.

{
  "mcpServers": {
    "io-github-nirholas-x402-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/x402-mcp"
      ],
      "env": {
        "SOLANA_SECRET_KEY": "...",
        "SOLANA_RPC_URL": "...",
        "MAX_PAY_USD": "...",
        "REQUIRE_CONFIRM": "...",
        "THREE_WS_BASE": "..."
      }
    }
  }
}

Fill in the environment variables with your own credentials.

• Runtime: Node.js 18+ (runs with npx).
• MCP client: Claude Code, Codex, Antigravity, Claude Desktop, Cursor or any other client that speaks MCP over stdio.
• Environment variables: SOLANA_SECRET_KEY, SOLANA_RPC_URL, MAX_PAY_USD, REQUIRE_CONFIRM, THREE_WS_BASE