x402 Protocol — Episode 5: One API Call That Replaced Five Features
After four episodes, KR Crypto Intelligence had 7 endpoints, was registered on 6 platforms, and accepted payments on two chains. Sounds impressive until you actually look at what the API does. Kimchi premium? BTC only. "BTC is trading at 0.5% premium on Upbit." Okay, cool — but there are 189 tokens trading on both Upbit and Binance. Which one has the highest premium? Which ones are trading below global prices? No idea. My API couldn't answer that. That bothered me more than I expected. What This Post Covers How KR Crypto Intelligence went from basic price data to actual market intelligence — and how one accidental API discovery replaced five features I was planning to build separately. This episode covers the product expansion from 7 endpoints to 10, from 1 token to 189, and the moment I realized Korean exchange regulation was secretly handing me a competitive advantage for free. The Gap Between "Data" and "Intelligence" I went back to the...