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mcp/harbor
Grok

commerce validators for Grok

org.scienceswarm/commerce-validators

Commerce validators: live EU VAT (VIES), EORI, email/MX lookups; IBAN/ABA/GTIN checksums; VAT rates.

client:Grok transport:streamable-http tools:10

Install commerce validators in Grok

.mcp.json (in your project root) 

{
  "mcpServers": {
    "commerce-validators": {
      "type": "http",
      "url": "https://mcp.scienceswarm.org/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

What Grok can do once it is connected

commerce validators in other clients

commerce validators MCP server