Braintree

Braintree, a PayPal service, is a full-stack payment platform for mobile and web. It specializes in marketplaces and platforms with its powerful Braintree Marketplace (now part of PayPal Commerce Platform). It targets high-growth tech companies and marketplaces. Pricing is pay-as-you-go (2.59% + $0.49 for US cards). It scores well for its excellent mobile SDKs, seamless PayPal integration, 'Drop-in' UI for fast checkout implementation, and sophisticated fraud tools (Kount). Its data portability feature allows merchants to move to another processor without losing customer vaults.