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mcp/harbor
Grok

readfetch for Grok

io.github.readfetch/mcp-x402-proxy

Stdio MCP proxy: free probe, then x402-paid ReadFetch tools; for hosts that cannot sign x402.

client:Grok transport:stdio runtime:npm

Install readfetch 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": {
    "mcp-x402-proxy": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@readfetch/mcp-x402-proxy"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
        "READFETCH_MAX_PAYMENT_USD": "<READFETCH_MAX_PAYMENT_USD>",
        "READFETCH_MCP_URL": "<READFETCH_MCP_URL>",
        "READFETCH_DEV": "<READFETCH_DEV>"
      }
    }
  }
}

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

readfetch in other clients

readfetch MCP server