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Plain-language explainers on prediction markets and the signals SharpPredict tracks.

• What Is a Whale Trade?A whale trade is a single prediction-market trade at or above a large notional size. SharpPredict flags Polymarket trades of $10,000 or more, attributed to the wallet that placed them.
• How Do Prediction Markets Work?Prediction markets are exchanges where contracts on real-world events trade between 0 and 100 cents, and each cent maps to an implied probability. When the event resolves, the winning side pays out at 100 and the losing side at 0.
• Polymarket vs Kalshi: What Is the Difference?Polymarket is an on-chain prediction market where every trade carries a wallet address. Kalshi is a US-regulated exchange whose public data carries no user identities. That single difference shapes what you can learn from each venue.
• How to Read an OrderbookAn orderbook lists resting bids and asks at each price level. On prediction markets prices run from 0 to 100 cents and map to probability. Reading the book means reading where size is resting and where it is getting taken.
• What Is a Sweep in Order Flow?A sweep is a burst of trades that clears multiple price levels quickly, when a participant takes several resting orders at once instead of waiting. It is one of the order-flow signals SharpPredict surfaces on Kalshi.
• Prediction Markets vs SportsbooksIn a prediction market you trade contracts against other participants and the venue takes fees. At a sportsbook you bet against the house, which prices a margin, the vig, into the odds. The difference changes what the price means.