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mcp/harbor
Grok

x402 Wallet for Grok

io.github.nirholas/x402-mcp

Self-custodial x402 wallet for AI agents: pay any service in USDC or $THREE from your own key.

client:Grok transport:stdio runtime:npm

Install x402 Wallet in Grok

.mcp.json (in your project root)

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "x402-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/x402-mcp"
      ],
      "env": {
        "SOLANA_SECRET_KEY": "<SOLANA_SECRET_KEY>",
        "SOLANA_RPC_URL": "<SOLANA_RPC_URL>",
        "MAX_PAY_USD": "<MAX_PAY_USD>",
        "REQUIRE_CONFIRM": "<REQUIRE_CONFIRM>",
        "THREE_WS_BASE": "<THREE_WS_BASE>"
      }
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

x402 Wallet in other clients

x402 Wallet MCP server