Considering the Durbin Amendment capped debit card processing at 0.05% and $0.21 per transaction, and interchange pricing for credit cards ranges from 0.65% to 2.4% plus a few cents for the auth fee, it is pure profiteering that PayPal and Stripe charge this much to process cards.
https://en.wikipedia.org/wiki/Durbin_amendment
https://usa.visa.com/dam/VCOM/download/merchants/visa-usa-in...