Crypto’s Day-of-the-Week Effect May Be a Mirage

Crypto markets never close. Bitcoin (BTC ) can trade at 3 a.m. on Sunday just as easily as it can during the middle of a Wall Street session on Tuesday. That makes cryptocurrency very different from stocks, which trade mainly during fixed market hours.

It also creates an interesting question for investors: if crypto trades every hour of every day, are there certain days when returns are consistently better?

A 2026 study published¹ in Finance Research Letters tested that idea using hourly price data from 12 cryptocurrencies. The researchers looked at four actively traded cryptocurrencies, Bitcoin, Ethereum (ETH ), Tether USDt, and BNB, and compared them with eight less active cryptocurrencies, including Avalanche (AVAX ), Cardano (ADA ), Chainlink, Dogecoin (DOGE ), Solana (SOL ), TRON (TRX ), USDC, and XRP.

At first glance, the results seem to suggest that some coins really do have better days. Bitcoin showed a positive Monday effect. Ethereum had a positive Wednesday effect. BNB stood out on Fridays. Cardano showed strength on Saturdays.

But when the researchers looked inside each day hour by hour, the story changed. The apparent day-of-the-week effect was usually caused by only a few short periods. In other words, it was not really a Monday effect, a Wednesday effect, or a Friday effect. It was more often a specific-hour effect that happened to occur on one of those days.

Why Daily Data Can Hide What Is Really Happening

Imagine that Bitcoin rises sharply during two hours on a Monday but is mostly flat during the other 22 hours. If an investor only looks at the average return for the entire day, Monday may appear unusually strong.

That can create the impression that Monday itself matters. Hourly data can reveal that the real pattern is much narrower.

This distinction matters because an investment pattern is only useful if it is reasonably consistent and practical to capture. A broad pattern that lasts all day could potentially influence when an investor buys or sells. A pattern concentrated in one or two hours is much harder to use, especially once trading fees, spreads, taxes, and the possibility that the pattern disappears are considered.

The study found exactly this type of concentration. Some individual weekday results were statistically significant, but a broader test comparing all days of the week found no cryptocurrency with a reliable market-wide weekday pattern.

• Bitcoin’s significant Monday returns were concentrated at 06:00 and 18:00 UTC.
• Ethereum’s Wednesday effect appeared mainly at 01:00, 02:00, 07:00, and 20:00 UTC.
• Tether’s Sunday effect was negative and concentrated around 10:00 and 21:00 UTC.
• BNB showed its most notable Friday movements late in the day, including a sharp reversal from hours 20 through 23.
• Cardano was the only less active cryptocurrency with a significant daily effect, with its strongest result at hour 0 on Saturday.

What the Numbers Looked Like

The following table uses only results reported in the study. Times are shown in UTC.

The More Important Lesson Is About Market Efficiency

For a first-time investor, the most useful idea in the study is not that a particular coin should be bought on a particular day. It is that markets can contain small pockets of predictability without offering an easy, repeatable way to make money.

This is an important difference.

A market is considered more efficient when widely available information is quickly reflected in prices. If every investor knew Bitcoin reliably rose every Monday, traders could start buying on Sunday. That extra demand could push prices higher earlier and gradually erase the Monday advantage.

The study suggests something similar may already be happening in crypto. The researchers found limited and short-lived inefficiencies, rather than persistent calendar anomalies. Some unusual return periods existed, but they were scattered across different assets and different hours.

There is another interesting result. The effects were more noticeable among the study’s actively traded cryptocurrencies than among its less active group. That may sound backwards. A beginner might assume a less active asset would be less efficient and therefore easier to exploit.

Instead, deeper liquidity and more regular trading activity may simply make small patterns easier to detect statistically. Thinly traded assets can contain more noise, irregular transactions, and large isolated moves. More activity can produce cleaner data even when the opportunity itself is small.

Why This Matters More Than Finding the “Best Day” to Buy Crypto

The study points toward a larger change in digital assets. Crypto is becoming a more mature financial market. As liquidity grows and professional trading becomes more common, obvious patterns should become harder to exploit for long periods.

That does not mean prices become predictable. It means the opposite. An inefficiency may emerge for a few hours, attract capital, and then weaken as traders react to it.

For long-term investors, that makes obsessing over the perfect weekday less useful. The difference between buying Bitcoin on Monday and Tuesday is unlikely to matter as much as asset selection, position size, risk tolerance, holding period, and the overall direction of the crypto market.

It also highlights why hourly and even more detailed data matter when researchers study assets that trade continuously. A daily closing price compresses 24 separate hours into one number. That works reasonably well for many questions, but it can be misleading when the goal is to identify exactly when a return pattern appears.

An Investment Angle Beyond Picking the Right Coin

There is another way for investors to think about the findings. If crypto markets continue to mature, the companies providing trading, custody, payments, stablecoin infrastructure, and derivatives may benefit from rising participation regardless of whether Monday or Friday produces the best return.

Coinbase Global (COIN ) is one of the clearest public-market examples.

The study did not examine Coinbase, so the company is not being presented as a direct beneficiary of the specific hourly patterns it found. The connection is broader. Coinbase operates infrastructure that investors and institutions use to trade and interact with digital assets. Its business is tied more closely to participation, transaction activity, custody, stablecoins, and other crypto services than to predicting which coin will rise during a particular hour.

That distinction is useful. Trying to profit from a three-hour market anomaly requires being right about timing. Owning shares in a trading infrastructure company is a different thesis. It is a bet that digital assets will remain important enough for people and institutions to keep trading, holding, transferring, and building financial products around them.

Coinbase has also been expanding beyond basic spot trading. Its business now includes derivatives, stablecoin economics, custody, subscriptions, and other services. In 2025, the company reported $6.9 billion in net revenue, with $4.1 billion coming from transaction revenue and $2.8 billion from subscription and services revenue. In the second quarter of 2026, Coinbase said its share of crypto trading volume reached a company record of 10.3%.

For investors, that makes Coinbase a useful example of a “picks and shovels” approach to crypto. Instead of trying to determine whether Bitcoin will outperform on Monday morning, the investment case focuses on the infrastructure used whenever market participants trade.

There are still substantial risks. Coinbase remains exposed to crypto trading volumes, asset prices, competition, fee pressure, and regulation. A public company connected to crypto can also move much more sharply than the broader stock market. It should not be viewed as a low-risk substitute for owning cryptocurrency.

The Takeaway for Investors

The most valuable conclusion from this research is not a new trading calendar. It is a warning against simple explanations.

A daily return can make a market pattern look much stronger and more persistent than it really is. Once the researchers examined crypto hour by hour, most apparent weekday effects narrowed to a few short windows. Those windows differed by asset, and broader statistical testing did not show a dependable day-of-the-week effect across the market.

For investors, that suggests the search for an easy recurring trading edge may be less useful than understanding how digital-asset markets are evolving. As crypto becomes more liquid, more institutional, and more heavily traded, the larger opportunity may lie not in guessing the right hour to buy, but in identifying the companies building the infrastructure underneath a 24-hour financial market.

References:

^{1. Aalipour, N., Mehdian, S., & Rezvanian, R. (2026). Are day-of-the-week effects in cryptocurrencies real? Intraday evidence from active and less active cryptocurrencies. Finance Research Letters, 110634. https://doi.org/10.1016/j.frl.2026.110634}