Ostium charges about 2 bps maker and 5 bps taker.
Ostium charges roughly 2 bps maker and 5 bps taker, where one basis point is 0.01%. On a $10,000 market (taker) order that is about $5.00 in fees.
Headline fees are only part of the cost. The funding rate is a recurring payment between longs and shorts that often matters more than the trading fee for positions held beyond a few hours, and slippage grows on larger orders.
Among the venues we track, Ostium ranks #19 by taker fee. Compare them all on the lowest-fee perp DEX ranking.