If sending 0 kr, the amount that will go to fees is 0 kr and the recipient will receive 0 kr. That's 0% going to fees, effectively.

* Using custom fee rate of 3.4% + 2.8 kr

To receive 0 kr, a payment of 0 kr should be sent. n/a kr will go to fees. That's 0% in fees, effectively.

* Using custom fee rate of 3.4% + 2.8 kr