South Korea's largest cryptocurrency exchange recorded a quieter trading week. Upbit posted weekly trading volume of 8.35 trillion won for the week ending October 18, 2026, a 15.5% decrease from the prior week, according to CryptoBriefing. That figure works out to approximately $6.28 billion.

Weekly volume is one of the most basic gauges of an exchange's activity: it measures how much capital actually changed hands across the venue, so a double-digit weekly decline reads as a broad cooling in participation rather than a shift in a single market. The more revealing detail sits inside the total. XRP was the most traded asset on the platform during the week, finishing ahead of both Bitcoin and USDT.

Inside the numbers

In mid-October 2026, Upbit's 24-hour trading volumes swung between $340 million and more than $1.2 billion on active days. That spread indicates the week was uneven from session to session, with the weekly total built from a mix of quiet and busy days rather than a steady flow.

The asset ranking adds further texture. XRP topped the volume table, with Bitcoin in second place and the stablecoin USDT in third.

USDT's presence in the top three merits brief context. Stablecoins are tokens designed to track the US dollar, so heavy USDT trading can reflect traders moving between risk and something closer to cash.

A wider slowdown across Korean exchanges

Upbit was not alone in feeling the slowdown. Volume across major South Korean platforms fell by 19.56% in the preceding week, pointing to a broader pullback across the sector rather than a problem specific to one venue.

Measured against that steeper decline, Upbit's 15.5% drop looks comparatively mild. Upbit has consistently held its position as the leading exchange in the country, regularly outpacing rivals such as Bithumb. Its volumes have often reacted to swings in domestic stock markets as well, which suggests many Korean traders treat crypto and equities as neighboring options rather than separate worlds.

What this means for traders and the market

The most immediate implication concerns liquidity. Lower volume generally means thinner order books, which can make prices more sensitive to large buy or sell orders. Thinner books also tend to widen the gap between the best available bid and ask, a mechanical consequence of fewer resting orders on each side of the market.

XRP's leadership is the other storyline to watch. Even as total activity fell, traders still concentrated a large share of their attention on a single asset — and that asset was not Bitcoin.

For the competitive landscape, rivals such as Bithumb face the same headwinds. The broader 19.56% drop recorded in the preceding week suggests the challenge across the sector is attracting volume at all, not simply winning share from one another.

Key signals going forward will be whether weekly volume stabilizes the 8.35 trillion won level or continues to slide, and whether XRP retains its spot at the top of the table.