If you're launching an online store — or outgrowing the payment gateway you started with — choosing the right provider is one of the highest-leverage decisions you'll make. The wrong choice means lost sales from declined transactions, unnecessary fees eating your margins, and checkout friction that drives customers away.
We analyzed data from our directory of 1,100+ payment providers to find the best options for e-commerce businesses in 2026. This isn't a list of every gateway that exists — it's the 10 that consistently stand out for online sellers, organized by what they actually do best.
Quick Comparison
| Provider | Best For | Typical Fees | Standout Feature |
|---|---|---|---|
| Stripe | Developer-first e-commerce | 2.9% + $0.30 | Best API and documentation in the industry |
| Shopify Payments | Shopify stores | 2.4%–2.9% + $0.30 | Zero third-party transaction fees on Shopify |
| PayPal | Maximizing checkout conversion | 2.9% + $0.30 | 400M+ active accounts, instant buyer trust |
| Square | Omnichannel (online + in-store) | 2.9% + $0.30 (online) | Unified commerce with free POS hardware |
| Adyen | High-volume global stores | Interchange++ (€0.11 + IC) | Local acquiring in 30+ countries |
| Checkout.com | Authorization rate optimization | 2.3%–2.9% + $0.30 | Intelligent payment routing |
| Mollie | European e-commerce | €0.29 + method fee | 35+ European payment methods out of the box |
| Helcim | Cost-conscious small businesses | IC + 0.40% + $0.08 | Zero monthly fees, automatic volume discounts |
| Braintree | Mobile-first stores | 2.9% + $0.30 | PayPal + Venmo + cards in one integration |
| WooCommerce Payments | WordPress stores | 2.9% + $0.30 | Manage everything inside wp-admin |
1. Stripe — Best Overall for Custom E-Commerce
Stripe remains the default choice for businesses building custom online stores, and for good reason. Its API is the gold standard — well-documented, consistently designed, and backed by client libraries in every major language. If you're building on a headless commerce stack or need granular control over your checkout flow, Stripe is hard to beat.
Beyond the core gateway, Stripe offers a full commerce toolkit: Stripe Billing for subscriptions, Stripe Connect for marketplaces, Stripe Tax for automated sales tax, and Radar for machine-learning fraud detection. The ecosystem means you can start simple and add capabilities without switching providers.
Fees: 2.9% + $0.30 per successful card charge. International cards add 1.5%, and currency conversion adds another 1%.
Best for: SaaS companies, developer-led teams, headless commerce builds, and any store that values API flexibility over plug-and-play simplicity.
2. Shopify Payments — Best for Shopify Merchants
If your store runs on Shopify, Shopify Payments is almost always the right call. It eliminates the 0.5%–2% third-party transaction fee Shopify charges when you use external gateways — a surcharge that adds up fast.
Because it's built directly into the platform (powered by Stripe on the backend), setup takes minutes. You get automatic access to Shop Pay, Shopify's accelerated checkout that converts 1.7x better than standard checkouts according to Shopify's own data. Multi-currency selling, fraud analysis, and chargeback management are all built in.
Fees: 2.4%–2.9% + $0.30 depending on your Shopify plan tier. Advanced Shopify drops the rate to 2.4%.
Best for: Any business already on Shopify, especially those on higher-tier plans where the fee savings are most significant.
View Shopify Payments' full profile →
3. PayPal — Best for Checkout Conversion
PayPal may not be the trendiest choice, but no other payment method matches its reach. With over 400 million active accounts worldwide, adding PayPal as a checkout option removes a major friction point for buyers who don't want to enter their card details on a site they haven't purchased from before.
The data backs this up: multiple industry studies show that offering PayPal at checkout increases conversion rates by 28%–44% compared to card-only checkouts. For smaller or newer stores without established brand trust, that conversion lift can be transformative.
PayPal also offers Pay Later options (Pay in 4, Pay Monthly) at no additional cost to merchants, which can increase average order values by 15%–20%.
Fees: 2.9% + $0.30 for standard processing. PayPal Checkout (the modern integration) supports cards, Pay Later, and Venmo through a single SDK.
Best for: New stores building trust, international sellers, and any merchant whose customers skew toward PayPal-heavy demographics.
4. Square — Best for Online + In-Store (Omnichannel)
Square is the obvious pick if you sell both online and in a physical location. Its free online store syncs inventory, orders, and customer data with Square's POS system in real time — no middleware or third-party sync tools needed.
For e-commerce specifically, Square Online offers a serviceable website builder with pickup, delivery, and shipping options. It's not as customizable as Shopify or WooCommerce, but if your primary business is in-store and online is a secondary channel, the simplicity is an advantage.
Fees: 2.9% + $0.30 for online transactions. 2.6% + $0.10 for in-person tap or dip.
Best for: Retailers, restaurants, and service businesses that need unified online and in-person payments without stitching together multiple systems.
5. Adyen — Best for High-Volume Global Stores
Adyen serves the world's largest e-commerce companies — Uber, eBay, Spotify, H&M — and its architecture reflects that scale. If you're processing more than $5 million annually across multiple countries, Adyen's interchange-plus-plus pricing will almost certainly save you money compared to flat-rate providers.
The real advantage is local acquiring. Adyen holds acquiring licenses in 30+ countries, which means transactions are processed locally rather than routed cross-border. This results in higher authorization rates (often 2%–5% higher) and lower interchange fees. For a business doing $10M in cross-border e-commerce, that can translate to hundreds of thousands in recovered revenue.
Fees: Interchange++ pricing (interchange + scheme fees + €0.11 per transaction). Minimum monthly invoice of ~€120.
Best for: Enterprise e-commerce, global marketplaces, and high-volume merchants who need local acquiring across regions.
6. Checkout.com — Best for Authorization Rate Optimization
Checkout.com has built its reputation on one thing: getting more payments approved. Its intelligent routing engine analyzes transaction data in real time and routes payments through the optimal path to maximize authorization rates. For high-volume merchants, even a 1% improvement in auth rates can mean millions in additional revenue.
Founded in London, Checkout.com has particularly strong coverage in Europe, the Middle East, and Asia-Pacific — regions where Stripe and PayPal's authorization performance can lag behind local acquirers.
Fees: Custom interchange++ pricing, typically 2.3%–2.9% + $0.30 for standard integrations.
Best for: Businesses processing high volumes where authorization rate improvements justify a more enterprise-focused setup.
View Checkout.com's full profile →
7. Mollie — Best for European E-Commerce
If your customers are primarily in Europe, Mollie deserves serious consideration. European e-commerce is fundamentally different from the US — bank transfers, direct debits, and local methods like iDEAL (Netherlands), Bancontact (Belgium), and Przelewy24 (Poland) often outperform card payments.
Mollie supports 35+ European payment methods with transparent, per-transaction pricing and no monthly fees. Setup is fast — most merchants go live within a day — and the dashboard is clean and intuitive. It's the anti-Adyen: built for SMBs who want simplicity, not enterprise sales calls.
Fees: €0.29 per transaction plus a payment method fee that varies (cards are typically 1.8% on top, iDEAL is €0.29 flat).
Best for: Small to mid-sized businesses selling primarily in Europe, especially in the Netherlands, Belgium, Germany, and France.
8. Helcim — Best for Cost-Conscious Small Businesses
Helcim is the rare payment processor that genuinely optimizes for the merchant's bottom line. Its interchange-plus pricing is among the most transparent in the industry: you see the exact interchange cost, plus Helcim's markup of 0.40% + $0.08 for online transactions.
There are no monthly fees, no setup fees, no cancellation fees, and no long-term contracts. Better yet, Helcim automatically reduces its markup as your volume grows — a feature almost no other processor offers.
Fees: Interchange + 0.40% + $0.08 (online). Volume discounts kick in automatically.
Best for: Cost-sensitive small businesses in the US and Canada that want honest pricing without negotiating enterprise contracts.
9. Braintree — Best for Mobile-First Stores
Braintree, owned by PayPal, is purpose-built for mobile and in-app commerce. Its Drop-in UI provides a pre-built, customizable checkout that works across iOS, Android, and web with minimal integration effort. The real draw is that a single Braintree integration gives you cards, PayPal, Venmo, Apple Pay, and Google Pay — all through one SDK and one settlement.
If your customers primarily shop on mobile devices (and for most e-commerce businesses, that's now over 60% of traffic), Braintree's mobile-optimized checkout flow can meaningfully improve conversion.
Fees: 2.9% + $0.30 per transaction. No monthly gateway fee.
Best for: App-based commerce, mobile-first DTC brands, and businesses that want PayPal and Venmo integrated alongside card payments.
View Braintree's full profile →
10. WooCommerce Payments — Best for WordPress Stores
WooCommerce Payments does for WordPress what Shopify Payments does for Shopify: it brings payment management directly into the platform you're already using. Powered by Stripe on the backend, it lets you view transactions, handle disputes, and manage deposits without ever leaving your WordPress dashboard.
The integration is seamless — no API keys to configure, no redirect to external dashboards. It also supports multi-currency selling in 100+ currencies, with automatic currency conversion at checkout.
Fees: 2.9% + $0.30 for US cards. International cards add 1.5%.
Best for: WordPress/WooCommerce store owners who want the simplest possible payment setup within their existing platform.
View WooCommerce Payments' full profile →
How to Choose: Three Questions That Matter Most
Before picking a gateway, answer these three questions:
Where are your customers? If they're global, you need a provider with local acquiring and local payment methods (Adyen, Checkout.com, Mollie). If they're primarily in the US, Stripe or Helcim will serve you well.
What platform are you on? Shopify merchants should default to Shopify Payments. WooCommerce stores should start with WooCommerce Payments. Custom builds should look at Stripe or Braintree. Fighting your platform's native payment integration rarely pays off.
What's your monthly volume? Under $50K/month, flat-rate pricing (Stripe, Square, PayPal) is simpler and competitive. Above $100K/month, interchange-plus pricing (Helcim, Adyen) starts saving real money. Above $1M/month, you should be talking to Adyen or Checkout.com about custom rates.
FAQ
Can I use multiple payment gateways on the same store?
Yes, and you probably should. The most common setup is a primary gateway (like Stripe or Shopify Payments) for card processing, with PayPal added as an alternative checkout option. Studies consistently show that offering two to three payment methods maximizes conversion without creating decision paralysis.
What's the difference between a payment gateway and a payment processor?
A payment gateway is the technology that captures and encrypts payment data at checkout. A payment processor handles the actual movement of funds between banks. Many modern providers (Stripe, Adyen, Square) are both — they handle the full transaction lifecycle. Legacy setups sometimes separate the two, pairing a gateway like Authorize.Net with a separate processor.
How much do payment gateway fees actually cost per year?
On $500K in annual e-commerce revenue at the standard 2.9% + $0.30 rate, you'll pay approximately $16,000 in processing fees. Switching to interchange-plus pricing (like Helcim) at the same volume could bring that down to $11,000–$13,000 — a savings of $3,000–$5,000 per year. At $2M in revenue, the savings from optimized pricing can exceed $15,000 annually.
Which payment gateway has the highest approval rates?
Authorization rates vary by region, card type, and business category, so there's no universal answer. However, providers with local acquiring licenses (Adyen, Checkout.com) consistently achieve 2%–5% higher approval rates on cross-border transactions compared to providers that route everything through a single country. For domestic US transactions, most major gateways perform within 1% of each other.
Data sourced from our directory of 1,100+ payment providers. Fees listed are standard published rates as of March 2026 — high-volume merchants can typically negotiate lower rates. See each provider's full profile for detailed, up-to-date information.