You are misunderstanding the op.
He wants a payment processor for merchants, eg. bitpay.
1% transaction fee
Exchanges then have a:
- 0,1 % withdrawal fee
- Unknown/hidden? currency conversion fee. I would think there is a fee here, but i didn't find it documented.
Additionally, exchanges like Binance are banned in many places ( because of tether fraud). Coinbase would be one of the only exchanges to consider as a business in eg. The US.