Which payment processor has the lowest fees?

For low-volume businesses, Stripe's pay-as-you-go model (2.9% + $0.30) is competitive and transparent. For businesses processing $10,000+/month, Helcim's interchange-plus pricing delivers the lowest effective rates — typically 30-50% less than flat-rate processors. Square's free POS software makes it the most affordable for brick-and-mortar startups. PayPal is generally the most expensive option for international transactions due to 3-4% FX fees.

How to choose the right payment processor for your business?

Start with your primary sales channel. Online-first businesses should evaluate Stripe's API and global reach. Brick-and-mortar businesses should start with Square's free POS ecosystem. Businesses selling on eBay, Etsy, or similar marketplaces benefit from PayPal's native integrations. As your volume grows past $10,000/month, compare your effective rate against Helcim's interchange-plus pricing. Always factor in FX costs if you sell internationally — Stripe's ~1% markup is significantly cheaper than PayPal's 3-4%.

How does Stripe compare to PayPal?

Stripe and PayPal have nearly identical domestic rates (2.9% + $0.30 vs 2.89% + $0.29). The real differences are: Stripe offers a developer-first API with 135+ currencies and ~1% FX markup; PayPal offers 400M+ consumer accounts, faster non-technical setup, and 200+ market presence but charges 3-4% for currency conversion. Choose Stripe for custom integrations and lower international costs; choose PayPal for consumer trust signals and marketplace integrations.

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Verdict

The best payment processor depends on your sales channel and volume. Stripe is the best choice for online-first businesses that need a developer-friendly API with 135+ currencies and global reach. Square is the best choice for brick-and-mortar businesses that need free POS software and integrated hardware. PayPal is the best choice for businesses that want the fastest setup and benefit from 400M+ consumer trust signals. Helcim is the best choice for businesses processing $10,000+/month that want the lowest possible fees through interchange-plus pricing.

Select tools:StripeSquarePayPalHelcimPayoneerAirwallexTipaltiAdyenBraintree (PayPal)Checkout.comCloverAuthorize.net

Feature	Stripe	Square	Adyen
Starting Price	Free · From $620/mo	Free · From $49/mo	From $0/mo
Pay-as-you-go	Free	Free	$0/mo
Stripe Billing Standard	Free	$49/mo	—
Stripe Billing Volume	$620/mo	$149/mo	—
Best For	Small Biz, Enterprise	Freelancers, Small Biz	Enterprise
Regions	US, CA, GB, AU, FR, DE, NL, JP, SG, HK, IE, CH, AT, BE, DK, FI, IT, NO, ES, SE, PT, PL, NZ, AE, BR, MX	US, CA, GB, AU, JP	US, CA, GB, AU, FR, DE, NL, global
Platforms	Web, Ios, Android	Web, Ios, Android, Desktop	Web, Ios, Android, Desktop
Key Features	•135+ currencies and 35+ payment methods including cards, wallets, BNPL, and local methods •Developer-first API with SDKs for 15+ programming languages and extensive documentation •Stripe Radar fraud detection with machine learning (included at 2.9% + $0.30; Radar for Fraud Teams $0.02/check) •Stripe Billing for subscription management, invoices, and recurring payments (0.7% of volume)	•Free POS software with inventory, employee management, customer loyalty, and reporting •In-person payments at 2.6% + $0.15 (tap, dip, swipe); online at 3.3% + $0.30 •Free card reader included on signup; full POS hardware available (Terminal, Register) •Square Online for e-commerce website building with integrated payments	•Unified commerce — online, in-store, and mobile payments on one platform •200-plus countries with local payment methods and currencies •Interchange-plus pricing for transparent cost at high volume •RevenueProtect — AI-powered fraud detection and prevention
Pros	+Developer-first API with best-in-class documentation, SDKs in 15+ languages, and comprehensive testing tools — the gold standard for custom payment integrations +135+ currencies and 35+ payment methods give Stripe the broadest global reach of any all-in-one payment processor +Built-in fraud detection via Stripe Radar uses machine learning and is included in the standard rate, saving thousands in fraud losses compared to manual review	+Easiest same-day setup for brick-and-mortar businesses — free card reader ships on signup, no merchant account approval needed +All-in-one POS ecosystem: payments, inventory, staff management, loyalty, and e-commerce in a single dashboard +Free POS software is genuinely capable for most small retail and restaurant operations — no monthly fee for core features	+Best unified commerce platform — single integration for online, in-store, and mobile payments globally +Interchange-plus pricing is more cost-effective than flat-rate at high transaction volumes +Used and trusted by the world's largest companies — Uber, Spotify, Microsoft, McDonald's
Cons	−Requires developer resources to unlock full potential — non-technical business owners may struggle with setup and customization compared to Square or PayPal −Flat-rate pricing (2.9% + $0.30) becomes expensive at high volume compared to interchange-plus or tiered pricing models from Helcim or other processors −FX markup of ~1% is cheaper than PayPal's 3-4% but more expensive than platforms built specifically for cross-border commerce like Wise or Airwallex	−Flat-rate pricing becomes expensive at higher volumes compared to interchange-plus processors like Helcim — businesses processing $10K+/month should compare alternatives −Online transaction rates (3.3% + $0.30 on Free plan) are among the highest in the category — Stripe charges 2.9% + $0.30 for online payments −Limited global availability compared to Stripe — Square operates in only 5 countries (US, CA, GB, AU, JP)	−Not suitable for small businesses — minimum monthly invoice and enterprise focus exclude SMBs −Implementation requires significant technical and operational resources −Complex pricing requires detailed analysis to compare against flat-rate competitors
Integrations	16+ integrations	7+ integrations	7+ integrations
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