Anyone using Shopify Payments will not have to pay any transaction fees, no matter which Shopify Plan you choose. Shopify Payments is the most powerful and easy to use payment processing system available. Benefits include: Instant approval, real-time payment tracking, full integration with the Shopify Admin, easy chargeback recovery, no transaction fees, and extremely competitive pricing. Learn more about Shopify Payments here: www.shopify.com/payments
Hidden fees are everywhere, except at Shopify!
Every reliable ecommerce solution on the market today charges a variable transaction-type fee, in one form of the other. Often times these fees are hidden to consumers until you get a surprisingly high bill at the end of the month. For example, we've recently read a lot of horror stories about surprise "excess bandwidth charges" found on monthly bills from other ecommerce platforms. The cost you could pay for excess bandwidth is almost never listed on any ecommerce provider websites, there's often nothing you can do to reduce these charges, and, worst of all, you can be charged for excess bandwidth even if you don't sell a single item.
Other providers hide transaction fees under their credit card processing system terms and conditions, calling them "Fraud Score" fees, "Gateway Access" fees, "Monthly Statement" fees, "Monthly PCI Compliance" fees, or something even more exotic. Some even charge "Early Termination" fees when you get fed up and decide to leave for another company.