Who is PayPal's biggest rival?

PayPal’s biggest rival depends on the market segment. In consumer peer-to-peer payments, Venmo and Cash App are major competitors. In merchant and checkout payments, companies like Stripe, Square, Apple Pay, and Google Pay compete strongly in different ways. For international and online commerce, some bank and card network solutions also overlap with PayPal’s role. Because PayPal serves both consumers and merchants, it faces competition from different companies in each category. So there is not one single rival that dominates every use case. The closest answer depends on whether you mean P2P transfers, online checkout, or business payments.