Prediction market whales: how to read large orders

By the Callquake team · Published November 10, 2026 · 4 min read

Last reviewed November 10, 2026. Laws and platform rules change; check the sources linked below.

Short answer: a whale order tells you where a lot of money just went. It does not tell you who is right. Read that way, large orders are one of the most useful things to watch in a prediction market; read as a tip, they are one of the easiest ways to fool yourself.

You can watch them on our Whale watch page, which lists large orders on both Kalshi and Polymarket.

What counts as a whale

There is no official line. Size only means something next to what is normal, and normal is small: a Pew Research Center study of about 12,000 Polymarket accounts in mid-2026 found the average trade was $6.50 (Pew Research Center, July 2026). Against that, a single $1,000 order is already unusual.

We sort orders by the dollars put on them, with names borrowed from crypto markets:

• Dolphin: $1,000 or more
• Shark: $10,000 or more
• Whale: $50,000 or more
• Humpback: $250,000 or more

Dollars, not contracts: 50,000 contracts bought at 2¢ cost $1,000, while 50,000 bought at 60¢ cost $30,000. We also mark an order as "big for this market" when it is 10% or more of that market's volume for the day, because $20,000 in a small market matters more than $100,000 in a presidential election market.

What a large order can tell you

• Where attention is. Somebody cared enough to put real money on this question now. That is a good reason to open the market and read its rules.
• Why the price moved. When the odds jump and there is no headline, a large order is often the plain explanation. On each big move we show the dollars of large orders seen while it happened, next to the news.
• How one-sided the money is. Each market page shows the large-order dollars on YES and on NO over the last 24 hours. Money split evenly reads very differently from money all on one side.

What it cannot tell you

• Whether the trader is right. In the Pew data, among the most active accounts (1,000 trades or more), 33% lost more than $1,000 and 27% gained that much.
• Why they traded. A large NO can be a hedge for someone who wins elsewhere if YES happens. A large sale can simply be someone taking profit.
• Their whole position. One person can use several wallets on Polymarket, and Kalshi does not publish identities at all.
• Anything about wrongdoing. A well-timed large order is not evidence that someone had private information. We never label a trader that way.

Four common mistakes

1. Counting parked money as an opinion. Buying YES at 98¢ on something nearly settled earns 2¢ a share. It is a savings account, not a view. We leave out orders paid above 95¢.
2. Reading the wrong side. Selling NO backs YES. We show the side the money is on, not just "buy" or "sell".
3. Ignoring the size of the market. Always compare the order with the market's daily volume.
4. Arriving late. By the time anyone sees an order, the price has usually moved. What is left is information, not an opportunity.

Kalshi and Polymarket are not the same here

Polymarket's international platform settles on a public blockchain, so every order comes with a wallet address, and we link each one to its public profile. Kalshi is a US-regulated exchange with identified accounts; its public feed shows size, price, side and time, and nothing about the trader. Polymarket's separate US exchange is not part of the public feed we read. See Kalshi vs Polymarket for the wider differences.

A sensible way to use it

1. See a large order on Whale watch or in an alert.
2. Open the market: has the price moved, and is there news behind it?
3. Check the 24-hour flow on the market page: one order, or many on the same side?
4. Read the market's rules on the platform before drawing any conclusion.

Questions

What is a whale in prediction markets?

A trader who places very large orders compared with everyone else. There is no official threshold. On Callquake a Whale order is $50,000 or more on a single market, a Shark is $10,000 or more and a Dolphin is $1,000 or more; a Humpback is $250,000 or more.

Can whale orders predict where the odds will go?

Sometimes a large order moves the price by itself, especially in a thin market. That is different from predicting the outcome. Large traders lose money too, and a big order can be a hedge or an exit. Use it as a reason to check the news and the rules of the market, not as a forecast.

Should I copy what whales do?

We do not recommend following any trader. You never see a whale's full position, their other accounts or why they traded, and by the time an order is public the price has usually moved. Callquake shows large orders as information only.

Can I see who is behind a large order?

On Polymarket's international platform you can see the wallet address, because trades settle on a public blockchain, but not the person behind it. On Kalshi nothing about the trader is published.

Callquake is information only. Nothing here is financial or betting advice.