Two rows on the whale stream can look almost identical. One wallet buys a large amount of an asset. Another wallet opens a long on the same asset in the same hour. The screen gives them the same visual weight and the same dollar figure, and if you copy both with the same size you have taken two different bets and only understood one of them. The difference is not how big the number is. It is whether the whale bought the asset or rented exposure to its price.
The venue is the field that classifies the wallet
The Whale Finder publishes its coverage on the page, and the list is the most useful thing on it for this purpose. It spans DEX perpetuals across Hyperliquid, GMX, Drift, dYdX and additional chains. It spans prediction markets on Polymarket and Opinion Trade. And it spans token launches, meaning early participants on Solana and EVM. Those are three genuinely different activities that happen to produce rows in the same stream.
I have heard this described as a toggle you flip between spot wallets and perp wallets. What I can confirm from the module itself is the coverage list and the live stream, not a control labelled that way, so I am not going to tell you a button exists that I have not seen. The classification is available to you regardless, because the venue and the asset field give it away. A position on Hyperliquid, GMX, Drift or dYdX is a perpetual. A BUY or SELL row against a token on Solana or an EVM chain is spot flow. A row on Polymarket is neither, it is a binary claim with a resolution date, and it should be read on its own terms.
That one classification changes the meaning of everything downstream: what the size figure represents, how long the position can survive, what forces the whale out, and how much of the move you can realistically capture behind them.
What a perpetual position actually reports
A perp position is exposure funded by margin. The notional you see is not the money the whale committed. At five times leverage a two million dollar long is four hundred thousand dollars of margin, and the whale can hold that with a small fraction of the balance sheet a spot buyer would need. This cuts both ways for you as a follower. It means the conviction implied by the size is weaker than it looks, and it means the position can be removed without the whale ever deciding to remove it.
The second thing a perp position reports is a running cost. Perpetuals hold their peg to spot through funding, and when a crowd sits on one side, that side pays the other. A large long is therefore a position with a clock attached. It is not merely an opinion about direction, it is an opinion about direction arriving fast enough to outrun the funding bill. When you copy a perp whale you inherit that clock, and if you enter a day late you inherit it with less runway.
The third thing, and the one that catches people, is that a perp position can end at a price the whale never chose. Liquidation is an exit generated by the venue. If you were copying the position spot, with no leverage, you would still be holding when the whale's row disappears. Neither of you is right or wrong at that moment, but you are no longer in the same trade, and the stream will not tell you which kind of exit you just watched.
What a spot buy reports that a perp cannot
A spot buy is funded in full. There is no margin, no funding rate, and no liquidation price. The whale who bought has committed the entire amount and can sit on it indefinitely, through a drawdown that would have removed the leveraged version of the same view weeks earlier. That is the single most important property of spot flow, and it is why a smaller spot print often carries more information than a larger perp one.
The second property is mechanical rather than psychological. Spot buying removes supply from the tradable float. Perp buying does not. A perpetual is a contract between two parties, and opening one creates a matching short somewhere. No coins moved, no supply left the market, nothing changed about how much of the asset is available to the next buyer. When people say whale accumulation tightens supply, that statement is true of spot flow and false of perp flow, and the stream shows both.
The third is that spot flow has a destination, and the destination is informative. Coins bought and left on a venue are positioned to be sold. Coins bought and moved off to an address that does not interact with venues look like a longer hold. The buy row is the start of that story rather than the whole of it, and following what happens to the balance afterwards tells you more about the whale's horizon than any label attached to the wallet.
Sizing a follow off each kind of print
Here is the practical part, and it is where the classification pays for itself. A perp print and a spot print justify different sizes and different stops, in opposite directions from what most people do.
Behind a perp whale, the honest position is small and short. You are copying a trade with a funding cost and a forced-exit mechanism, entered by someone who is at least twelve seconds ahead of you and probably much more, since the latency figure on the header is the platform's, not your reaction time. Size it as a trade with a defined invalidation level, decide the level before you enter, and accept that you may be stopped out by the same move that liquidates the whale. Copying a leveraged position with leverage of your own is how a modest adverse move becomes a total loss.
Behind a spot whale, the honest position is larger relative to your risk budget but slower. There is no funding cost eating it and no liquidation to race. What you are copying is an accumulation thesis, and the correct holding period is measured in weeks, which means your entry precision matters far less than whether the thesis is real. The failure mode here is not the stop being hit, it is boredom, and boredom does not show up in any risk calculator.
Where each read stops working
A perp position that is a hedge looks exactly like a perp position that is a view. A desk long spot and short perp is flat, and only the perp leg appears on the venue you are watching. The module's own ranking metrics include cross-venue aggregate exposure for a reason, and the single-row read is precisely the read that misses this. If a large short appears on a wallet whose spot balance you have never checked, you have not seen a bearish whale, you have seen one leg of something.
Spot flow has its own version of the problem. A transfer that arrives as a BUY row may be an internal move between wallets under the same control, or an over-the-counter fill being settled on chain, neither of which is new demand. The tell is usually the counterparty and the roundness of the amount, and if you cannot check either, treat a single spot print as weaker evidence than a sequence of them from the same wallet over several days.
The check that keeps me out of most of this trouble takes one line in a notebook. Before sizing anything off a whale row, write down which of the three the wallet was doing: a perpetual, a spot purchase, or a prediction market claim. If you cannot answer from the row in front of you, that is the answer, and the position is not one you can copy responsibly.