Fattmerchant

Fattmerchant (now Stax) offers a unique subscription-based pricing model with true interchange-plus pass-through rates. It provides an omnichannel platform with API, virtual terminal, and POS integrations.

It targets growing businesses with consistent monthly volume that want predictable costs. It charges a monthly membership fee (starting at $99) plus wholesale interchange fees. It ranks for its transparent cost structure, which can save high-volume merchants significant money. The platform includes advanced business intelligence tools and a unified dashboard for all payment channels.