I Turned a Free API Into a $200/Month Side Project The API existed. People needed it. They just didn't want to figure it out themselves. The Origin Story Last year I was building a crypto tracking dashboard. I needed real-time price data, signals, and historical performance metrics. The problem? Every exchange has a different API format. Some use REST, some WebSocket, some GraphQL. Authentication varies wildly. Rate limits are all over the place. I spent two weeks just normalizing data from 5 exchanges. Then it hit me: if I need this, other developers do too.…