builtwith-api

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MCP Server ​

Add BuiltWith API tools to Claude Desktop, Cursor, or any MCP client.

How It Works ​

The server turns all 13 BuiltWith API methods into tools your MCP client can call.

Setup ​

Claude Desktop ​

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

json
{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "builtwith-mcp"],
      "env": {
        "BUILTWITH_API_KEY": "your-key-here"
      }
    }
  }
}

Cursor ​

Add to your Cursor MCP config (.cursor/mcp.json in your project or ~/.cursor/mcp.json globally):

json
{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "builtwith-mcp"],
      "env": {
        "BUILTWITH_API_KEY": "your-key-here"
      }
    }
  }
}

Claude Code ​

Add to your Claude Code settings:

json
{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "builtwith-mcp"],
      "env": {
        "BUILTWITH_API_KEY": "your-key-here"
      }
    }
  }
}

Other Clients ​

For other MCP clients, use:

  • Command: npx
  • Args: ["-y", "builtwith-mcp"]
  • Env: BUILTWITH_API_KEY=your-key-here

Or pass the key as a flag:

json
{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "builtwith-mcp", "--api-key", "your-key-here"]
    }
  }
}

For a local install instead of npx:

bash
npm install -g builtwith-mcp

Then set the command to builtwith-mcp.

Available Tools ​

Tool names start with builtwith_. Zod validates their inputs.

ToolInputDescription
builtwith_free{ lookup: string }Basic technology profile
builtwith_domain{ lookup, ...opts }Detailed tech profile with spend
builtwith_domainLive{ lookup: string }Real-time technology scan
builtwith_lists{ technology, ...opts }Domains using a technology
builtwith_trends{ technology, ...opts }Technology adoption trends
builtwith_relationships{ lookup }Related domains via shared identifiers
builtwith_keywords{ lookup }Domain keywords
builtwith_trust{ lookup, ...opts }Trust and verification score
builtwith_companyToUrl{ companyName, ...opts }Domains for a company name
builtwith_tags{ lookup }Tracking/analytics tags
builtwith_recommendations{ lookup }Technology recommendations
builtwith_redirects{ lookup }Redirect chains
builtwith_product{ query }E-commerce product search

Testing ​

Use the MCP Inspector to test the server:

bash
npx @modelcontextprotocol/inspector -- npx -y builtwith-mcp --api-key YOUR_KEY

Example prompts ​

Example prompts:

  • "What technologies does stripe.com use?"
  • "Find all domains using Shopify"
  • "What are the technology trends for React?"
  • "Is example.com a trustworthy domain?"
  • "What companies are related to example.com?"