Polymarket and Kalshi are the two largest prediction market platforms, but they differ significantly in structure, fees, market selection, and user base. Understanding these differences helps you choose the right tool.
Polymarket operates on-chain using USDC on Polygon, with no identity verification required for basic trading. Kalshi is a CFTC-regulated exchange that requires full KYC and operates in US dollars.
Market selection differs: Polymarket offers a wider range of markets including politics, sports, crypto, and culture. Kalshi focuses on US-centric markets with regulatory approval for each contract.
PolySignals tracks whale activity across Polymarket because the on-chain nature of the platform makes all trades transparent. Kalshi's centralized order book does not offer the same level of transparency.
For traders who want to compare odds across platforms, our scanner shows price discrepancies between Polymarket and other markets. When the same event is priced differently on two platforms, it represents a potential analytical opportunity.