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Perpetuals and funding
A perpetual is a derivative with no expiry. Funding is a fee paid between longs and shorts so the contract price stays near the spot price. You can pay it all night.
What it is
You do not hold the coin. You hold a contract that pays or takes as the price moves. The venue, or the contract, can liquidate you.
The fee that runs
When the crowd is crowded on one side, that side pays the other. A position that looks flat on price can still bleed funding.
Read the funding interval and the current rate. Add it to the fee check. It is a cost.
Check yourself
If the price does not move, can a perp still cost you?
Yes. Funding can flow against you the whole time.
After this you can add the funding rate to the cost of holding, before you leave a perp open.