Billium for Grok

Install Billium in Grok

.mcp.json (in your project root)

{
  "mcpServers": {
    "billium": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@billium/mcp"
      ],
      "env": {
        "BILLIUM_API_KEY": "<BILLIUM_API_KEY>",
        "BILLIUM_MERCHANT_ID": "<BILLIUM_MERCHANT_ID>",
        "BILLIUM_BASE_URL": "<BILLIUM_BASE_URL>"
      }
    }
  }
}

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