Taker fee

The fee Kalshi charges when you cross the spread to trade immediately against a resting order. It scales with the number of contracts and is largest for prices near 50 cents.

Because the taker fee peaks at 50 cents and is charged every time you trade, it punishes high-frequency trading in coin-flip markets hardest. Resting a limit order instead of taking, when you can get filled, avoids the fee entirely and is one of the few reliable edges available to a retail trader.