Stripe, Braintree, Intuit and others have massively popularized the idea of the flat fee payment processing account — no monthly fees and a per transaction cost that is simple and easy to understand.  In fact, MerchantPlus also recently introduced such a plan (called the “Starter Plan”) that offers a very common and competitive per transaction cost of 2.9% per sale.  These plans have become the most popular options for startups, developers and small online businesses