Bithumb, South Korea's second-largest cryptocurrency exchange, saw its share among the five won-based venues fall to 19.8%, slipping below 20% again after briefly touching 19% earlier in the month, while market leader Upbit held 77.8% and stretched its advantage to nearly four times Bithumb's. Coinone stood at 2.1%, DigitalX at 0.18% and Gopax at 0.03%, according to CoinGecko data. Bithumb had held a share in the 30% range through the first half of the year, but its weekly average dropped about five percentage points from roughly 34% in early June to 29% more recently as Upbit climbed from 54% to 68%, a shift the market links to thinner overall crypto volumes steering traders toward the deepest liquidity. Competitive pressure is rising after DigitalX, the Mirae Asset-backed exchange formerly known as Korbit, launched a one-year waiver of trading fees on all KRW-market listings for every member, a full-year, all-coin promotion that lifted its share by only 0.01 percentage point on day one but is being watched as a potential catalyst if Mirae Asset's capital and client base accelerate inflows. Bithumb is responding with targeted fee relief and investment support for high-volume traders verified at rival venues, while Upbit has said it is monitoring developments; with bitcoin back above $80,000 for the first time in three months, industry participants say the recovering market could become a turning point in who captures returning and new investors.