Affirm

Affirm (founded by PayPal co-founder Max Levchin) takes a fundamentally different, significantly more serious approach to BNPL. While Afterpay focuses on a 22-year-old buying a $60 lip gloss, Affirm heavily dominates the "High Average Order Value" (AOV) sector. If a consumer wants to buy a $3,000 Peloton bike, a $1,500 Purple mattress, or a $4,000 set of car tires, they use Affirm. Because it handles massive transaction sizes, its underwriting algorithm is incredibly sophisticated. Unlike Klarna's simple "soft check," Affirm acts much closer to a traditional bank loan, offering true, long-term financing (up to 48 months). It is famous for its strict "No Hidden Fees" policy. When a customer checks out, Affirm shows them the exact dollar amount of interest they will pay in a massive font, refusing to use compounding interest or late fees. It is heavily favored by massive enterprise merchants (like Walmart and Amazon) because of its adaptive checkout. The Affirm algorithm looks at the cart value in real-time; if the cart is $50, it offers a simple "Pay in 4." If the cart is $2,000, it automatically switches to offering a 12-month financing plan, mathematically optimizing the conversion rate based on the specific price of the goods.