Futures have a funding fee mechanism (especially on perpetual contracts):

Funding is not paid to KuCoin — it’s exchanged between traders buying and selling.

Every 8 hours, depending on the funding rate, longs might pay shorts or vice-versa. �

KuCoin +1

Example:

If the funding rate is positive, long positions pay short positions.

If negative, shorts pay longs. �

KuCoin

This encourages the futures price to stay close to the spot price.