BuiltWith API
TypeScript library, MCP, and agent-friendly CLI for the BuiltWith API.
What is BuiltWith API?
BuiltWith API is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to typescript library, mcp, and agent-friendly cli for the builtwith api.
TypeScript library, MCP, and agent-friendly CLI for the BuiltWith API.
This server falls under the Search & Data Extraction category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- TypeScript library, MCP, and agent-friendly CLI for the Buil
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx builtwith-apiConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use BuiltWith API
The BuiltWith API MCP server wraps the BuiltWith technology profiling API as a set of MCP tools, giving AI assistants like Claude and Cursor the ability to look up what technologies any website uses — from CDNs and analytics platforms to CMS systems and payment processors. It exposes 13 API methods covering domain lookups, technology trends, keyword searches, company-to-URL mapping, and trust signals. Sales teams, competitive analysts, and growth engineers use it to research prospect websites and build lead lists based on technology stack.
Prerequisites
- Node.js 18 or later
- A BuiltWith API key — sign up at builtwith.com/plans (free tier available with limited lookups)
- An MCP client such as Claude Desktop, Claude Code, or Cursor
Obtain a BuiltWith API key
Sign up at builtwith.com and navigate to your account settings to generate an API key. The free tier supports a limited number of lookups per month; paid plans unlock full historical data and bulk queries.
Install the MCP server globally
Install the builtwith-mcp package globally so it is available on your PATH for use in MCP client configurations.
npm install -g builtwith-mcpSet the API key environment variable
Export your BuiltWith API key as an environment variable. The MCP server reads it from BUILTWITH_API_KEY at startup.
export BUILTWITH_API_KEY=your_api_key_hereAdd the server to your MCP client configuration
Open your MCP client config (claude_desktop_config.json for Claude Desktop, or .cursor/mcp.json for Cursor) and add the builtwith server entry with your API key in the env block.
Verify the connection
Ask your AI client to run a test lookup using the builtwith_free tool, which requires no API credits for basic technology detection.
BuiltWith API Examples
Client configuration
Complete claude_desktop_config.json entry using npx to run the builtwith-mcp server. Replace YOUR_KEY with your actual BuiltWith API key.
{
"mcpServers": {
"builtwith": {
"command": "npx",
"args": ["-y", "builtwith-mcp"],
"env": {
"BUILTWITH_API_KEY": "YOUR_KEY"
}
}
}
}Prompts to try
Use these prompts in Claude Desktop or Cursor to research website technology stacks with BuiltWith.
- "What technologies does shopify.com use? Check their analytics, CDN, and payment stack."
- "Look up the technology trends for React over the last 12 months."
- "Find websites using Salesforce CRM and Marketo together — I'm building a prospect list."
- "What is the complete technology profile of competitor.com?"
- "Check if example.com has any trust signals like SSL certificates or security badges."Troubleshooting BuiltWith API
API calls fail with an authentication error
Verify that BUILTWITH_API_KEY is correctly set in the env block of your MCP config and that the key is active. Log into your BuiltWith account to confirm the key is not expired and that you have remaining API credits.
builtwith-mcp command not found after npm global install
The global npm bin directory may not be on your PATH. Run npm bin -g to find the directory and add it to your PATH, or use the npx invocation in your MCP config instead: command: npx, args: ["-y", "builtwith-mcp"].
Domain lookup returns empty results for a valid website
Some domains may not yet be indexed by BuiltWith. Try the builtwith_domain_live tool for a real-time crawl of the site rather than a cached lookup. Note that live crawls consume more API credits than standard lookups.
Frequently Asked Questions about BuiltWith API
What is BuiltWith API?
BuiltWith API is a Model Context Protocol (MCP) server that typescript library, mcp, and agent-friendly cli for the builtwith api. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install BuiltWith API?
Follow the installation instructions on the BuiltWith API GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with BuiltWith API?
BuiltWith API works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is BuiltWith API free to use?
Yes, BuiltWith API is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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Set Up BuiltWith API in Your Editor
Choose your AI client for step-by-step setup instructions.
Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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