World Economy

Trading Volume Patterns Spark Market Integrity Questions at Prediction Platforms

Kalshi and Polymarket face scrutiny over unusual trading activity as both companies pursue higher valuations and potential public offerings. Observers have identified suspicious patterns on products across both exchanges. On Polymarket's international exchange, markets with multiple contracts show disproportionately high volume on lower-probability outcomes compared to more likely events. This quirk appears across election, sports and central bank decision markets. Kalshi's ether perpetual futures contract displayed abnormally concentrated trading, with transactions sized between $5,495 and $5,505 comprising nearly half of dollar volume despite limited resting liquidity. Both companies deny wash trading or inorganic activity on their platforms. Market observers worry the patterns indicate inflated volumes. Regulators expect designated contract markets to monitor real-time trading data for abnormalities to maintain market integrity.