MCP Server

Expose BuiltWith API lookups as MCP tools for Claude Desktop, Cursor, and any MCP-compatible AI client.

How It Works

The MCP server exposes all 13 BuiltWith API methods as tools. Your AI assistant can call them directly during conversation.

1. Configure — Add the server config to your AI client's settings file.

2. Ask — "What technologies does stripe.com use?" — your assistant calls the right tool.

3. Get Results — Structured data returned inline. No copy-pasting from browser tabs.

Setup

Claude Desktop

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

{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "--package", "builtwith-api", "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):

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

Claude Code

Add to your Claude Code settings:

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

Other Clients

Any MCP-compatible client can use the server. The general pattern:

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

Or pass the key as a flag:

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

For a local install instead of npx:

npm install -g builtwith-api

Then use builtwith-mcp as the command directly.

Available Tools

All tools are prefixed with builtwith_ and accept typed input schemas validated by Zod.

Tool	Input	Description
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:

npx @modelcontextprotocol/inspector node dist/mcp.js --api-key YOUR_KEY

Example prompts

Once configured, you can ask your AI assistant things like:

• "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?"