There is no single best payment gateway for every merchant. The right choice depends on where you sell, how you sell, your volume, and your technical resources. For most online businesses, the strongest shortlist is Stripe, PayPal, Adyen, Square and Braintree. Each leads in a different situation, covered below.
Quick answer
- Best overall for developer-led online businesses: Stripe
- Best for buyer trust and fast setup: PayPal
- Best for large, multi-country enterprises: Adyen
- Best for small businesses selling online and in person: Square
- Best for merchants who want PayPal and Venmo plus a custom card flow: Braintree
How we selected these gateways
This list is an editorial shortlist, not a measured ranking. We looked at five criteria: breadth of payment methods, geographic reach, developer tooling, pricing transparency, and fit for common merchant profiles. Fees, supported countries, and eligibility change often, so confirm every detail on the provider's official page before you commit.
Comparison table
| Gateway | Best for | Main strength | Main limitation |
|---|---|---|---|
| Stripe | Startups, SaaS, custom checkouts | Flexible APIs and broad product suite | Can be complex beyond basic checkout |
| PayPal | Merchants who want instant buyer trust | Wallet familiarity at checkout | Less flexible for custom experiences |
| Adyen | Enterprises with global volume | Single platform for gateway and acquiring | Typically suits higher volumes |
| Square | Small businesses and retail | Online and in-person on one stack | Less suited to complex global setups |
| Braintree | Platforms wanting PayPal and card flows | PayPal and Venmo alongside cards | Narrower brand recognition than parent PayPal |
1. Stripe
Stripe is the default pick for many software-led businesses. Its APIs, hosted checkout options, billing tools, and marketplace features let teams start simple and add complexity later.
Strengths: strong documentation, wide product suite, good fit for subscriptions and platforms.
Limitations: the product range can feel heavy for a merchant who only needs a basic checkout, and add-on products carry their own fees.
Best suited to: SaaS companies, startups, and merchants with development resources.
2. PayPal
PayPal is often the gateway customers already trust, which can help checkout conversion, particularly with first-time buyers. Setup is quick and requires little technical work.
Strengths: brand familiarity, fast onboarding, buyer-facing protections.
Limitations: less control over the checkout experience, and account holds or reviews are a common merchant concern, so read the terms carefully.
Best suited to: new online stores and merchants who want a familiar payment button alongside cards.
3. Adyen
Adyen combines gateway, processing, and acquiring in one platform, which reduces dependence on multiple vendors. It is built for companies selling across many markets, channels, and currencies.
Strengths: unified global infrastructure, local payment method coverage, enterprise reporting.
Limitations: pricing and onboarding generally favor higher-volume merchants, so smaller businesses may find it a poor fit.
Best suited to: enterprises and fast-scaling international brands.
4. Square
Square is a practical choice when you sell both online and in person. Payments, point of sale, invoicing, and basic business tools sit in one ecosystem.
Strengths: ease of use, unified online and in-store reporting, quick setup.
Limitations: less flexible than API-first providers for complex global or platform use cases.
Best suited to: small businesses, retailers, and service providers.
5. Braintree
Braintree is a PayPal company that serves merchants wanting a developer-friendly gateway with PayPal and Venmo built in alongside card processing. Branding and product naming have shifted over time, so check how PayPal currently presents it.
Strengths: PayPal and Venmo acceptance, custom checkout control, support for multiple payment methods.
Limitations: its position relative to PayPal's other products can be confusing, so confirm current packaging.
Best suited to: merchants and platforms who want PayPal acceptance with a more customizable integration.
How to choose the right payment gateway
- Map your markets. Check supported countries, currencies, and local payment methods for every region you sell in.
- Understand the full cost. Compare per-transaction fees, currency conversion, chargeback fees, and add-on tools, not just the headline rate.
- Check your risk profile. Some industries face stricter approval. If you are in a restricted category, see our guide to high-risk merchant account providers.
- Review integration effort. Match the provider's tooling to your team's technical capacity.
- Confirm payout timing and reserves. Settlement speed and holds affect cash flow.
- Plan for redundancy. Many merchants use two gateways, such as a card-focused provider plus PayPal.
Common mistakes to avoid
- Choosing on headline fees alone and ignoring cross-border and dispute costs.
- Skipping the terms on account reviews, reserves, and prohibited businesses.
- Picking an enterprise platform too early, or a basic one that you outgrow in a year.
- Ignoring the checkout experience on mobile.
Verdict
Stripe suits most developer-led online businesses, PayPal wins on buyer familiarity, Adyen fits global enterprises, Square serves omnichannel small businesses, and Braintree suits merchants who want PayPal and Venmo with more control. Treat this as a shortlist, then verify pricing and eligibility directly with each provider.
Next step: Explore our payment gateway reviews to compare these providers in more detail.
