There are a couple of reasons for this. Processors employ various pricing models such as flat rates, interchange plus, and tiered structures. Each has its nuances: Flat rate: Users receive a fixed percentage and transaction fee for all transactions (e.g., 2.7% and $0.15 per transaction). This model is straightforward and predictable. Interchange plus (cost plus): Users pay a fixed markup on wholesale costs (e.g., 0.3%, or 30 basis points, on all wholesale costs). This is the most transparent, assuming no hidden fees. Tiered: Users encounter different rates for different cards and transaction methods. While common, it’s intricate and requires expertise to optimize for business benefit. The diversity in pricing methods contributes to the difficulty in making comparisons because it’s not always evident which one a processor is using. In addition, many processors either fail to explain or obscure certain fees, a prevalent issue in the payment industry. Therefore, finding a processor you trust becomes crucial in navigating this complexity and is why we recommend working with a trusted broker like Five Star Merchant Advocates.