eBay: 13.25% on the total amount of the sale up to $7,500 per item. For any portion of the sale over $7,500, a fee of 2.35% is applied.
Whatnot: 8% commission on the sold price of an item. Additionally, a payment processing fee of 2.9% + 30 cents/pence is applied to the subtotal, tax, and shipping price paid by a buyer for a given order.
Mercari: Payment Processing Fee of $0.50 plus 2.9% of the transaction price, which includes the item price, shipping, service fee, and sales tax.
Stockx: 3% payment processing fee plus a base transaction fee of 9% for Level 1 sellers. The total Stockx fee is 12% of the item's price.
PayPal (Goods & Services): 3.49% of the transaction amount plus $0.49 per transaction.
The net price is calculated by subtracting the fees from the item's price.