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Grok

Dutyfinch for Grok

dev.workers.cybermax-tools.cybermax/dutyfinch

US tariff API + MCP: HTS duty rates, Section 301 lists. Keys $19/mo; 50 free calls a day.

client:Grok transport:streamable-http tools:4

Install Dutyfinch in Grok

.mcp.json (in your project root)

{
  "mcpServers": {
    "dutyfinch": {
      "type": "http",
      "url": "https://dutyfinch.cybermaxtools.com/mcp?via=mcp-registry"
    }
  }
}

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

What Grok can do once it is connected

Dutyfinch in other clients