Newranked by 
1
Harmony1 chain Gas fees paid by users
$4
$188
2Sushi9 chains SushiSwap charges a flat 0.3% fee
$4
$497
3Synapse18 chains Bridge fees paid by users
$0
4Allbridge18 chains Users pay bridge fee for each transfer on the source chain.
$0
$0
A 0.3% fee is collected from each swap
$0
$0