PayPal

PayPal is a ubiquitous digital wallet and payment processor known for high consumer trust. Key features include one-click checkout (PayPal Express), Buy Now Pay Later (Pay in 4), and peer-to-peer via Venmo.

It targets virtually all online merchants, especially those selling to consumers. Pricing is 2.99% + $0.49 per transaction for standard payments. Its top ranking stems from massive user adoption (over 400 million accounts), reducing checkout friction, and offering multiple funding sources including bank accounts and credit lines, making it essential for conversion optimization.