The market runs every hour of every day, and the institutions that support it do not. That mismatch gives weekend trading a distinct character that persists despite the market's continuous nature.
Liquidity provision is a staffed activity
Automated systems quote around the clock, but the risk limits they operate under are set by people, and those people are not at their desks on a Sunday.
Firms typically reduce exposure and tighten limits before the weekend, so the same algorithms quote smaller size than they would midweek.
The book is therefore thinner in a way that is invisible until something large arrives and finds much less depth than expected.
Banking hours constrain the flow of new money
Fiat deposits settle through banking systems that observe weekday hours. Money committed on a Saturday often cannot reach an exchange until Monday.
Existing stablecoin balances can move instantly, but topping up from a bank account cannot, so the pool of deployable capital is effectively fixed until the week resumes.
This asymmetry matters most during stress, when the response to a falling market is usually to add collateral rather than to sell.
Thin books amplify ordinary flow
A trade that would barely register on a Wednesday can move the price noticeably on a Sunday, purely because there is less resting size to absorb it.
Leveraged positions are triggered by those exaggerated moves, and the cascade dynamics that follow do not care that the initiating trade was unremarkable.
Weekend moves are consequently more likely to be retraced when the week opens and normal depth returns.
Traditional markets are closed, but their news is not
Macroeconomic developments and policy news that break outside trading hours have nowhere to be expressed except in markets that remain open.
Crypto absorbs that repricing alone, sometimes overshooting because it is the only available proxy for a view about something else entirely.
When equity and bond markets reopen, the initial crypto reaction is often revised as the broader repricing is distributed across more instruments.
The pattern is a tendency, not a rule
As market making has become more automated and better capitalised, the weekday and weekend gap has narrowed from what it was in earlier years.
Holidays now matter as much as weekends, since a quiet week in traditional markets thins crypto liquidity for several consecutive days.
Treating the effect as a reliable pattern to trade against is where it stops being useful, because the exceptions are exactly the episodes that cost the most.