JPYC, a yen-backed stablecoin, debuted on Upbit and within the first hour traded more than 4 times above its reference value. It opened at 12 won and spiked to 37.6 won, pushing far beyond its yen peg, and this wasn’t unique to a single pair, but across Korean won, bitcoin, and USDT listings.
The move mattered less as a story about JPYC itself than as a stress test for market structure, exposing what can happen when a newly listed token meets thin liquidity, with too few orders near fair value to absorb demand. That price dislocation has now prompted South Korea’s Financial Services Commission to review whether formal crypto market making should be allowed.