Hi, I'm Rogan Koo — CEO of UnoSilicon, a semiconductor design house based in South Korea. By day, I work with engineers on chip architecture and EDA tooling. By night, I keep a close eye on crypto markets.

My background in semiconductors means I think in systems, data, and precision. When I started exploring crypto arbitrage — particularly the kimchi premium between Korean exchanges and global markets — I quickly realized that reliable, real-time premium data was surprisingly hard to find. Most tools were either delayed, incomplete, or paywalled.

So I built CoinGapRadar. What started as a personal script to track XRP and XLM premiums on Upbit vs Binance evolved into a full multi-country, multi-coin tracker. I wanted something honest and transparent — no hidden fees, no subscriptions, no fluff.

UnoSilicon (우노실리콘) is a semiconductor design house — we work on custom chip solutions, EDA automation, and IP design. The company operates in a space where accuracy, timing, and efficiency aren't just nice-to-haves; they're existential requirements.

That mindset translated directly into how I think about crypto. The arbitrage window between exchanges can open and close in minutes. Slippage, transfer time, withdrawal fees — every variable matters. I found that XRP and XLM were ideal for arbitrage: 3–5 second transfers, near-zero fees. CoinGapRadar was designed to surface exactly that kind of actionable signal.

The Net Profit Calculator in the app isn't an afterthought — it reflects real decisions I've had to make: accounting for exchange fees on both sides, network withdrawal costs, and expected slippage before clicking "send."

Crypto markets are global, but pricing is local. The same XRP can trade at wildly different prices in Seoul, Tokyo, Mumbai, and Lagos — all at the same time. That's not a bug; it's a structural feature of fragmented markets and capital controls.

For years, only sophisticated traders with access to proprietary tools could monitor these gaps in real time. I wanted to change that. Transparency in crypto markets is good for everyone — it helps traders make informed decisions, and over time, price discovery improves globally.

CoinGapRadar doesn't tell you what to do. It shows you what's happening, as it happens, across 9 countries and 6 coins — free, no login required. The rest is up to you.