JPYC Surges Above 3 Yen on Upbit After Korean Launch

Japan’s first regulated yen‑stablecoin, JPYC, launched on South Korea’s largest crypto exchange, Upbit, on Sept 17. The token, designed to maintain a 1 : 1 peg with the Japanese yen, immediately broke its peg as Korean retail demand outstripped the thin on‑chain supply.

Initial price distortion on Upbit

Upbit opened JPYC trading at a reference price of 8.81 won per token. Within minutes the price jumped to 12 won, then surged past 27 won, and peaked at 35.7 won – more than three yen per token. The exchange’s chart showed a brief wick reaching the 37‑won range, marking the highest observed premium.

Supply response and arbitrage restoration

JPYC Inc. quickly increased issuance reservations, allowing users to mint JPYC at the 1‑yen peg and move the new supply to markets paying the premium. On Sept 17 alone, ¥1.686 billion was minted, more than twelve times the previous single‑day record of ¥139 million. Within roughly 48 hours circulating supply grew from about ¥1.9 billion to over ¥4.2 billion, and the premium receded as arbitrage mechanisms re‑engaged.

Impact on other markets

The price shock also rippled to JPYC’s primary pre‑listing venue, Uniswap, where residual effects briefly pushed prices toward three yen. However, the token remained fully redeemable for 1 yen throughout the episode.

Key takeaways

• JPYC’s Upbit debut triggered a premium of over 300 % within an hour.
• Rapid minting of ¥1.69 billion on the first day expanded supply and helped restore the peg.
• Within two days, circulating supply more than doubled, reducing the premium.
• The event illustrates how thin supply on a new exchange can cause extreme short‑term price deviations for regulated stablecoins.