Renegade charges a 2 basis point (0.02%) protocol fee.
In addition, the relayer that you're connected to can charge an additional fee on top of the protocol fee. The relayer that's accessible through trade.renegade.fi charges an addition 2 basis points (0.02%), for a total of 4 basis points (0.04%) when using trade.renegade.fi
There are no tiers; every transaction pays a 2 basis point fee at the minimum.