Market Orders
Fastest execution. Your order fills immediately at the best available price, which makes market orders ideal when timing matters more than price precision. In thin markets, expect slippage.
Limit Orders
You pick your price. The order sits on the book until a counterparty matches it, so you get exactly the entry you want. The risk is that the market moves away and your order never fills at all.
Platform Differences
Kalshi supports both market and limit orders natively. Polymarket routes limit orders through the CLOB, and market orders fill against the existing book.