2026 Payment Gateway Fee Comparison: Stripe / PayPal / Square / Adyen

Payment processing fees are hidden costs for online businesses. For low-margin businesses, a 1% fee difference can mean the difference between profit and loss.

1. Fee Overview

Standard Transaction Fees

Platform Domestic Card International Card Monthly Fee
Stripe 2.9% + $0.30 2.9% + $0.30 + 1.5% $0
PayPal 3.49% + $0.49 4.99% + $0.49 $0
Square 2.6% + $0.10 3.5% + $0.10 $0
Adyen 2.7% + $0.20 3.1% + $0.20 €0

2. Actual Cost Calculation

Scenario 1: $20 Transaction (Domestic)

Platform Fee Net Amount
Stripe $0.88 $19.12
PayPal $1.19 $18.81
Square $0.62 $19.38
Adyen $0.74 $19.26

Scenario 2: $100 Transaction (International)

Platform Fee Net Amount
Stripe $4.40 $95.60
PayPal $4.98 $95.02
Square $3.60 $96.40
Adyen $3.30 $96.70

Scenario 3: $10,000 Monthly Volume ($50 avg)

Platform Monthly Fee Annual Fee
Stripe $790 $9,480
PayPal $948 $11,376
Square $600 $7,200
Adyen $680 $8,160

3. Volume Discounts

Stripe

  • Over $100K/month: Negotiable rates
  • Stripe Plus program

PayPal

  • Merchant Rate: Over $3K/month eligible
  • PayPal Pro: $30/month for custom checkout

Square

  • Transparent pricing, no volume discounts
  • Square Plus for large merchants

Adyen

  • Fully custom pricing based on volume, industry, risk
  • €100K+ annual volume negotiable

4. Hidden Costs

Chargeback Fees

Platform Chargeback Fee Refund Fee Refunded?
Stripe $15 ✅ Yes
PayPal $20 ❌ No
Square $0 (limited) ✅ Yes
Adyen €25 ✅ Yes

5. Best Use Cases

Stripe: Best for most online businesses

  • Reasonable fees, excellent API
  • 135+ payment methods
  • Best for: SaaS, e-commerce, digital products

PayPal: Best for brand trust

Square: Best for omnichannel

  • Unified online + offline management
  • Lowest fees for small transactions
  • Best for: Physical stores + online, small merchants

Adyen: Best for high volume

  • Custom pricing for large volumes
  • Single platform for global payments
  • Best for: Large e-commerce, international brands

6. Money-Saving Tips

  1. Encourage local payment methods
  2. Include fees in pricing
  3. Choose settlement currency wisely
  4. Control chargeback rates
  5. Optimize checkout flow

7. Summary

Balance cost, conversion rate, and user experience. Consider using two payment channels (e.g., Stripe + PayPal) for maximum conversion.