PayPal charges a transaction fee based on a percentage of the sale amount plus a fixed fee. For domestic transactions in the US, the fee is 3.49% of the sale amount plus $0.49.
Stripe charges a transaction fee based on a percentage of the sale amount plus a fixed fee. The fee for Stripe is 2.9% of the sale amount plus $0.30.
Gumroad charges a flat transaction fee of 10% of the sale amount. There is no additional fixed fee.
Etsy charges a transaction fee of 6.5% of the sale amount plus a payment processing fee of 3% plus $0.25 for each transaction.
The total amount after fees is calculated by subtracting the calculated fees (transaction fee plus fixed fee) from the original sale amount. This provides the actual amount you'll receive after accounting for payment processing fees.