The Defiant compared trading costs on Polymarket US and Kalshi using a simple 100-contract example. In the scenario outlined in the article, a trader buys at 40 cents and sells at 60 cents, and the resulting taker profit is nearly identical across the two prediction market platforms. The piece frames the comparison around a hypothetical round-trip trade rather than a broader market performance review.
The article also notes that the outcome is not universal. The comparison can shift depending on whether a trader uses resting orders instead of taking liquidity, and depending on the funding method used to move money onto the platform. Those variables can change the effective cost structure even if the headline example shows little difference between the two venues.
The Defiant compared Polymarket US and Kalshi on the cost of a 100-contract trade.
A simple 100-contract example
In the article’s hypothetical case, a trader buys at 40 cents and sells at 60 cents. Under that setup, taker profits on the two platforms come out nearly the same.
What can change the comparison
The article adds that the result can differ if the trader uses resting orders or changes the funding method. Those factors can alter how Polymarket US and Kalshi compare on total trading costs.
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