The average monthly fee (including gateway) on the transfs marketplace is $16 / month, which is included in the calculation (try putting the volume slider to $0

The average monthly fee (including gateway) on the transfs marketplace is $16 / month, which is included in the calculation (try putting the volume slider to $0). Likewise, Paypal Pro (which you need if you want to accept payment without sending the user off-site) has a $30 / month fixed fee. Of course there are certainly crooked merchant account providers that will hose you with bigger monthly fees, so it pays to be careful. The last thing a startup needs is extra fees.