Payment Gateway Fees in 2026: Stripe, PayPal, Adyen, and More

Key takeaways

• Payment gateways should be compared by total payment cost per order rather than headline transaction rates alone.
• Standard flat-rate US online card processing is typically close to 3%, but fixed transaction fees can materially affect merchants with lower average order values.
• Stripe offers simple flat-rate pricing with no monthly gateway fee, making costs relatively predictable for many online merchants.
• PayPal Checkout carries a higher standard US transaction cost but can provide value through customer familiarity and PayPal wallet adoption.
• Adyen uses interchange++ pricing, which is more variable but can become attractive for high-volume and international merchants.
• Monthly fees, international card surcharges, currency conversion, disputes, refunds, and other secondary charges can significantly change the real cost of a gateway.
• B2B merchants should evaluate ACH, bank transfers, net terms, stored payment methods, purchase-order fields, and Level 2 or Level 3 card data in addition to standard card processing.
• Platform compatibility matters because Adobe Commerce, Shopify Plus, BigCommerce, and Salesforce Commerce Cloud handle gateway integrations and associated costs differently.
• High-volume merchants should evaluate negotiated pricing or interchange++ rather than automatically accepting public flat-rate fees.
• The right gateway depends on transaction volume, average order value, customer geography, payment preferences, ecommerce platform, and B2B requirements.

When this applies

This applies when an ecommerce business is selecting a new payment gateway, reviewing existing processing costs, expanding internationally, or reconsidering its payment architecture as transaction volume grows. It is particularly relevant when several providers appear similar based on advertised rates but differ substantially in fixed fees, international charges, dispute costs, payment methods, and platform integration requirements. The framework is also useful for B2B merchants that need ACH, invoicing, payment terms, corporate-card optimization, or ERP synchronization in addition to standard online card payments.

When this does not apply

This does not apply when payment processing is already contractually fixed and the business has no practical ability to change providers or renegotiate rates. It may also be unnecessary for very small merchants whose payment volume is too low for minor pricing differences to justify migration effort. A gateway comparison should not be treated as a pure pricing exercise when the actual business requirement is fraud management, complex marketplace payments, subscriptions, local acquiring, or another specialized payment capability that requires a broader architecture assessment.

Checklist

1. Calculate your current payment cost per completed order.
2. Document average order value and monthly transaction volume.
3. Identify the countries and currencies your customers use most frequently.
4. List the card networks, wallets, bank transfers, and local payment methods customers expect.
5. Compare percentage fees and fixed per-transaction fees separately.
6. Include monthly gateway or account fees in the cost model.
7. Review international-card and currency-conversion charges.
8. Document dispute, chargeback, refund, and other secondary fees.
9. Determine whether your volume qualifies for negotiated or interchange++ pricing.
10. For B2B, evaluate ACH, invoices, net terms, stored payments, and purchase-order workflows.
11. Check whether Level 2 and Level 3 card data can reduce corporate-card processing costs.
12. Verify native support and integration quality for your ecommerce platform.
13. Account for any platform-specific transaction fees when using third-party gateways.
14. Define how payment status, refunds, and reconciliation should synchronize with ERP or other financial systems.
15. Compare providers using projected annual payment cost and operational fit rather than the advertised rate alone.

Common pitfalls

• Choosing the gateway with the lowest headline percentage without calculating total cost per order.
• Ignoring fixed transaction fees when average order values are relatively low.
• Forgetting international card and currency-conversion costs.
• Comparing flat-rate and interchange++ pricing as though they were directly equivalent.
• Assuming public rates are the best rates available at high transaction volumes.
• Evaluating B2B payment providers only on standard card-processing capabilities.
• Ignoring ERP synchronization, reconciliation, and payment-status workflows.
• Selecting a gateway without verifying ecommerce platform compatibility.
• Overlooking additional platform transaction fees when using a third-party payment provider.
• Migrating gateways for small fee savings without accounting for implementation effort, operational risk, and customer payment preferences.