Is there a way/product to trade BTC leverage on exchanges without paying funding every 8h?
There is nothing easier and for this you just need to close your order a few minutes before the funding rate is calculated and after this calculation, you can open your position again. But you need to do this only if it is you who will pay for the funding. For example, you have a long position open, while the funding is negative, in this case you will pay a commission to those who have a short position open.