How to Connect Claude to Any REST API in 2 Minutes (Step-by-Step Guide)

What if you could ask Claude "What's my Stripe MRR this month?" and get a real number back — not a hallucinated guess, but an actual API response? Or ask "What's the current Bitcoin price?" and have Claude fetch it from CoinGecko, live, right inside your chat window? This isn't a hypothetical. It takes about 2 minutes to set up, and you don't need to write a single line of code. I'll walk you through the entire process. The Problem: Claude Is Smart But Isolated Claude can write code, analyze documents, explain quantum physics. But ask it anything that requires live data — your server metrics, your payment dashboard, today's crypto prices — and it has to make something up. It literally can't reach the outside world. This is the biggest gap between "impressive demo" and "actually useful tool." You want Claude to be your assistant, not just your chatbot. The Solution: MCP (One Sentence Version) MCP (Model Context Protocol) is an open standard that lets Claude call external tools — includi