Online Payment Solutions

Stripe

leader

+

Developer-first financial infrastructure platform processing $1.9 trillion in payment volume in 2025, powering 5 million-plus businesses including 90% of the Dow Jones Industrial Average.

PayPal

leader

+

Pioneering consumer and merchant payments network offering checkout, digital wallet, Venmo, Braintree, and Pay in 4 BNPL, with over 430 million active accounts globally.

Adyen

leader

+

Amsterdam-based enterprise payment platform handling processing, gateway, and acquiring in one infrastructure, serving Netflix, Spotify, and 100,000-plus merchants globally.

Fiserv

leader

+

Large-scale payments and financial services infrastructure provider, one of the top five payment gateway processors by market share and the back-end processor used by many banks and payment companies.

Worldpay

leader

+

Enterprise-grade global payment processor serving merchants across 175-plus countries in 153 currencies, now operating as part of Global Payments following a $24.25B acquisition that closed in early 2026.

Klarna

notable

+

Swedish BNPL and commerce network with 118 million active consumers and 966,000 merchants, now publicly traded and expanding into broader payments, digital banking, and advertising.

Square (Block)

notable

+

All-in-one payments and commerce platform from Block, combining online checkout, flat-rate card processing, free POS software, and inventory tools, popular with small and mid-size merchants.

Checkout.com

notable

+

Global payments platform built for high-volume online merchants, handling 150-plus currencies with real-time analytics, fraud protection, and local payment methods.

Braintree

notable

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PayPal-owned developer-oriented payment gateway with a mobile-first design, handling Venmo, Apple Pay, and card payments in a unified API used by subscription platforms and mobile apps.

Authorize.Net

notable

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One of the oldest U.S. payment gateways, offering reliable fraud detection, recurring billing, and broad e-commerce platform compatibility for established small and mid-size businesses.

Airwallex

notable

+

Global financial platform for high-growth businesses, enabling multi-currency accounts, cross-border payments, and online checkout with settlement in 20-plus currencies to eliminate FX markups.

Nuvei

notable

+

Montreal-based enterprise payment processor with 700-plus payment methods, global acquiring, and deep coverage in high-risk verticals including gaming, financial services, and regulated industries.

Razorpay

notable

+

India-focused full-stack payments platform enabling businesses to accept online payments, manage payouts, and run subscriptions, with expanding operations in Singapore, Malaysia, and the US.