When each processor wins
Headline rates don't tell the full story. Each processor has scenarios where it's meaningfully cheaper or more convenient:
| Scenario | Winner | Why |
|---|---|---|
| In-person retail / restaurant | Square | 2.6% + $0.10 is the cheapest in-person rate. No monthly fee on the base plan. Hardware ecosystem is mature. |
| Online B2C e-commerce, domestic only | Stripe or Square (tie) | Both at 2.9% + $0.30. Stripe for developer flexibility; Square for zero-effort storefront (Square Online). |
| International / cross-border e-commerce | Stripe | Stripe supports 135+ currencies, transparent international pricing. Square and PayPal have weaker international handling. |
| B2B invoicing with large amounts | Square (ACH) | Square ACH at 1% with $1 min beats both Stripe ACH ($5 cap) and PayPal for invoices $500+. For card-paid invoices, Square 3.3% wins. |
| Microtransactions (< $10) | PayPal Micropayments | 4.99% + $0.09 is the only tier with a sub-$0.30 fixed fee. Beats the other two for small sums. |
| High dispute / chargeback risk | Square | No per-dispute fee. Seller Protection absorbs up to $250/month. Stripe charges $15/dispute, PayPal $20. |
| Developer platform, marketplace, SaaS | Stripe | Stripe Connect is the only serious platform-ready product. Square and PayPal don't compete here. |
| Trust-sensitive international buyers | PayPal | Despite higher fees, PayPal's brand trust lifts checkout conversion in certain buyer segments (international, older demographics, certain categories). |