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Grok

lob for Grok

io.usefulapi/lob

Verify US & international addresses and send physical mail (postcards, letters, checks) via Lob.

client:Grok transport:streamable-http

Install lob in Grok

.mcp.json (in your project root)

{
  "mcpServers": {
    "lob": {
      "type": "http",
      "url": "https://lob.usefulapi.io/mcp"
    }
  }
}

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

lob in other clients