Whale buying pressure: how to read big buys vs big sells

Whale buying pressure is the balance between large aggressive buys and large aggressive sells over a short window. If, in the last 15 minutes, $12M of big trades were buyers taking offers and $4M were sellers hitting bids, buying pressure is clearly ahead. It shows who is in a hurry right now. It doesn't show who is right, and this guide covers both what the reading means and where it fools people.

Taker buys and taker sells

Every trade has a buyer and a seller, so in raw terms buying always equals selling. What differs is who started the trade. On an order book, a maker leaves an order resting at a price and waits. A taker comes along and fills it immediately, accepting the current price.

• A taker buy happens when someone buys at the ask, taking resting sell orders. That is a buyer who wanted in now.
• A taker sell happens when someone sells at the bid, filling resting buy orders. That is a seller who wanted out, or wanted to be short, now.

Pressure counts the taker side. Big taker buys push price up through the sell orders above it. Big taker sells push it down through the buy orders below. When large trades lean heavily to one side, price usually leans that way too, at least in the short run.

What a 15-minute buying vs selling bar shows

On sasa's Data page, the Whale trades section lists every trade of $100K or more on Hyperliquid's 20 busiest markets as it happens. Above the list is a bar that splits the last 15 minutes of those trades into buying and selling by dollar value. With made-up numbers:

• Buys $9M, sells $3M: the bar is three-quarters buying. Large traders have been paying up to get in.
• Buys $5M, sells $5.5M: roughly even. Big money is active on both sides, with no clear lean.
• Buys $1M, sells $6M: heavy selling. Someone is pushing out, or opening shorts, with size.

Fifteen minutes is short on purpose. It shows what is happening now, not what happened this morning. The trade-off is that one or two very large trades can swing the whole bar, so always look at the list underneath it as well. A bar leaning 80% buy because of thirty separate $200K buys means something different from a bar leaning 80% buy because of a single $8M trade.

The limits: when pressure lies

• Market makers. Their job is to trade both sides all day. Sometimes they take liquidity to rebalance inventory, which shows up as taker flow with no view behind it.
• Hedges. A fund that holds a large spot position elsewhere may sell perpetuals here to protect it. On the bar it looks like heavy selling. In reality nobody expects the price to fall.
• One-off sweeps. A single big order that fills against many resting orders is added up as one trade on sasa. That's the honest way to count it, but one sweep can dominate 15 minutes of data. Our guide to reading big crypto trades explains sweeps in detail.
• Closing, not opening. A taker buy can be a short covering, not a new long. The bar can't tell the difference.
• Only part of the market. The bar covers large trades on Hyperliquid's busiest markets. Big flows on other exchanges don't appear here.

Combining pressure with funding and open interest

Pressure becomes much more useful when you check it against two other numbers on the same page:

1. Open interest. Heavy buying with rising open interest suggests new longs are opening. Heavy buying with falling open interest suggests shorts are closing. The second kind of move can be fast but often fades once the shorts are done. See what is open interest.
2. Funding. If buying pressure is strong and funding is already very positive, longs are crowded and paying a lot to stay in. That is a fragile setup. If buying pressure is strong while funding is flat or negative, the buying is against a skeptical crowd, which is a different situation.
3. Who is trading. When one side of a big trade is a known top trader, sasa shows their name, for example 'Whale #4 bought'. A lean driven by several of the leaderboard's best accounts is worth more attention than one driven by unknown wallets.

The Whale moves section adds a slower view: what the 30 biggest 30-day winners have opened, added to, cut, flipped or closed. If the 15-minute bar leans to buying and several of those traders have just added to longs, the picture is consistent. If the bar leans to buying while the top traders are cutting, be careful about reading too much into it.

A practical routine

Glance at the bar, then the trades under it, then the names. Check whether the lean holds on the $1M+ filter. Then look at funding and open interest for the coin involved. If all of it points the same way, you have a clearer picture of what big money is doing. It is still a picture of the last few minutes, and markets reverse all the time. If you want to be told when particular traders move rather than watching the bar, see whale alerts.

sasa's Futures page lets people trade Hyperliquid's markets with up to 20x leverage where available. Leverage can lose everything you put in, and nothing in this guide is financial advice.