Polymarket
Prediction markets for following and trading event outcomes
An exchange for trading on real-world event outcomes

Kalshi is an exchange for event contracts, allowing participants to take positions on whether specified real-world outcomes will occur. Its markets cover areas such as economics, elections, sports, weather, and company performance. Public market pages show prices, implied probabilities, trading volume, and charts, giving visitors a way to follow how expectations change over time.
Users can browse by topic or search for an event, then review its contract rules before deciding whether to participate. The platform also offers portfolio tools and developer APIs for working with market data and trading workflows.
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