Tech Stack Detector

MCP Factory: pay-per-use MCP tools for AI agents

MCP Factory builds small, reliable, pay-per-use tools that AI agents can call over the Model Context Protocol (MCP). Each tool runs as an Apify Actor and is exposed through Apify's hosted MCP server — no installation, no infrastructure, no subscription. Your agent calls the tool directly; usage bills through your Apify account at flat, transparent per-result prices.

The tools

🔍 Tech Stack Detector

Find out what any website is built with. Scans a list of URLs and identifies the technologies behind each site — CMS, ecommerce platform, web frameworks, analytics, CDN, web server, and more — using the open-source webappanalyzer fingerprint dataset (7,500+ technologies across 109 categories). A fast, affordable Wappalyzer / BuiltWith alternative at roughly $5 per 1,000 sites.

• MCP server URL: https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector
• Apify Store: apify.com/apifmcpfactory/tech-stack-detector
• Try an example task: run it with sample input
• Details: tech-stack-detector/

🧾 EU VAT Validator

Validate EU VAT numbers in bulk against VIES, the European Commission's official VAT validation service — and get the official consultation number on every check as audit evidence for tax inspections. Bulk-safe with automatic retries, tolerant of messy input formats, $5 per 1,000 validations flat.

• MCP server URL: https://mcp.apify.com?tools=apifmcpfactory/eu-vat-validator
• Apify Store: apify.com/apifmcpfactory/eu-vat-validator
• Try an example task: run it with sample input
• Details: eu-vat-validator/

🤖 llms.txt Checker

A complete AI readiness audit for any website in one pass: checks llms.txt, llms-full.txt, robots.txt AI-crawler policy (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, Bytespider), and sitemap.xml, then returns a 0–100 AI readiness score with a plain-English list of exactly what to fix. ~$5 per 1,000 sites.

• MCP server URL: https://mcp.apify.com?tools=apifmcpfactory/llms-txt-checker
• Apify Store: apify.com/apifmcpfactory/llms-txt-checker
• Try an example task: run it with sample input
• Details: llms-txt-checker/

Connect all three tools at once

One MCP server URL exposes any combination of tools. To give your agent the full MCP Factory toolkit:

https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector,apifmcpfactory/eu-vat-validator,apifmcpfactory/llms-txt-checker

Claude Desktop (claude_desktop_config.json):

{    "mcpServers": {        "mcp-factory": {            "command": "npx",            "args": [                "mcp-remote",                "https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector,apifmcpfactory/eu-vat-validator,apifmcpfactory/llms-txt-checker",                "--header",                "Authorization: Bearer YOUR_APIFY_TOKEN"            ]        }    }}

Cursor (.cursor/mcp.json):

{    "mcpServers": {        "mcp-factory": {            "url": "https://mcp.apify.com?tools=apifmcpfactory/tech-stack-detector,apifmcpfactory/eu-vat-validator,apifmcpfactory/llms-txt-checker",            "headers": {                "Authorization": "Bearer YOUR_APIFY_TOKEN"            }        }    }}

Replace YOUR_APIFY_TOKEN with your API token from Apify Console. New Apify accounts include free monthly usage credit, so you can try every tool before paying anything.

How pricing works

Every tool is pay-per-event: a small flat fee per run plus a flat fee per result. No subscriptions, no tiers, no minimums. Usage is billed through the Apify account whose token your agent uses — you can see every run, result, and charge in Apify Console.

About

MCP Factory publishes on the Apify platform as apifmcpfactory. Each tool is designed around the same principles: one clear job, bulk-safe execution (one output row per input, always), honest pricing, and output an AI agent can use without post-processing.