How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Stripe is the strongest default for online and SaaS businesses that need developer tools, subscriptions, and marketplaces.
- Square fits retail, restaurants, and service businesses that sell in person and online from one system.
- PayPal helps checkout conversion, because many buyers already trust and use it, though fees are higher for some card payments.
- Adyen and Checkout.com suit global enterprises that need local payment methods and unified acquiring across regions.
- Helcim and interchange-plus pricing often beat flat-rate pricing once monthly volume grows, so compare effective rates, not headline rates alone.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Stripe | Online and SaaS payments | See website | No |
 Square | In-person and online retail | See website | Yes |
 PayPal | Buyer-trusted checkout | See website | No |
 Adyen | Global enterprise acquiring | See website | No |
 Checkout.com | Global online performance | See website | No |
 Helcim | Transparent interchange-plus | See website | No |
 Shopify Payments | Shopify stores | See website | No |
 Authorize.net | Classic payment gateway | See website | No |
 Braintree | Developer gateway with PayPal | See website | No |
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We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
The best top payment processing software
#1Stripe
Best for: Online and SaaS payments4.2/5 on
G2 (462 reviews, checked Oct 2026)
Visit stripe.com
Starting priceSee website
Free planNo
Stripe is the default choice for online-first businesses for a clear reason: the developer experience. APIs, prebuilt checkout, billing for subscriptions, and Connect for marketplaces cover most online payment needs without custom infrastructure. A small team can accept payments quickly, then add invoicing, tax, and fraud tools as it grows.
The flat-rate model is simple, but it is not the cheapest at scale. Once volume rises, interchange-plus pricing often costs less, and Stripe volume pricing requires a conversation. For online, SaaS, and marketplace businesses, Stripe still offers the widest combination of tools in one platform.
What we like- Strong APIs, billing, and marketplace tools
- Supports many payment methods and currencies
- No monthly fee on standard pricing
Watch out for- Flat-rate pricing gets costly at high volume
- Account reviews can hold payouts
#2Square
Best for: In-person and online retail4.6/5 on
G2 (1,208 reviews, checked Oct 2026)
Visit square.com
Starting priceSee website
Free planYes
Square suits businesses that sell face to face and want online sales in the same system. The point-of-sale app, card readers, inventory tools, and online store work together, so a shop, cafe, or salon can start quickly without stitching tools together. Setup is simple, and there is no monthly fee for basic use.
Square is less ideal for complex online-only businesses that need deep developer control. Its strength is the combined retail system, not a marketplace API. For stores and service businesses with a physical location, that combined system is often worth more than a slightly lower processing rate.
What we like- Free point-of-sale software and hardware options
- Combines payments, inventory, and appointments
- Fast setup
Watch out for- Online rates are higher than in-person rates
- Flat-rate pricing can cost more at high volume
#3PayPal
Best for: Buyer-trusted checkout4.4/5 on
G2 (2,751 reviews, checked Oct 2026)
Visit paypal.com
Starting priceSee website
Free planNo
PayPal remains useful because buyers know it. A PayPal button can lift conversion for stores whose customers already hold PayPal balances or prefer not to enter card details on a new site. Venmo support adds value for US buyers, especially younger shoppers.
PayPal is often best used beside another processor, not as the only option. Fees for some card payments are higher than Stripe or Square, and account reviews can freeze funds during disputes. For conversion-focused stores, the trust benefit can outweigh the fee gap, but check your effective rate.
What we like- Widely recognized checkout brand
- Supports PayPal, Venmo, cards, and wallets
- Fast buyer checkout
Watch out for- Card fees can be higher than rivals
- Account holds are a common complaint in reviews
#4Adyen
Best for: Global enterprise acquiring4.0/5 on
G2 (44 reviews, checked Oct 2026)
Visit adyen.com
Starting priceSee website
Free planNo
Adyen is built for enterprises and platforms that sell across countries and channels. One integration can handle cards, wallets, and local payment methods, with unified reporting across online and in-store sales. That consolidation helps large retailers and marketplaces reduce vendor sprawl.
Adyen is not a small-business starter tool. Pricing is custom, onboarding is more involved, and the platform assumes a team that can manage global payments. For companies with international volume and complex routing needs, Adyen offers scale that flat-rate processors cannot match.
What we like- Unified acquiring across online, mobile, and in-store
- Many local payment methods
- Strong data and risk tools
Watch out for- Enterprise focus and custom pricing
- Smaller businesses may find setup heavy
#5Checkout.com
Best for: Global online performance4.6/5 on
G2 (71 reviews, checked Oct 2026)
Visit checkout.com
Starting priceSee website
Free planNo
Checkout.com focuses on online payment performance for digital and global businesses. It offers acquiring in many regions, local payment methods, and tools to improve authorization rates, which directly affects revenue for high-volume stores. The API and reporting suit engineering-led teams.
Smaller businesses may find the sales-led onboarding and custom pricing more than they need. Checkout.com makes most sense when online volume is large, international, or performance-sensitive, and when a small lift in approval rates is worth real money.
What we like- Global acquiring with many currencies and local methods
- Strong authorization and fraud tools
- Developer-friendly APIs
Watch out for- Custom pricing
- Best value comes at higher volume
#6Helcim
Best for: Transparent interchange-plus3.9/5 on
G2 (19 reviews, checked Oct 2026)
Visit helcim.com
Starting priceSee website
Free planNo
Helcim appeals to businesses that want to see what they actually pay for card processing. Interchange-plus pricing passes through card network costs plus a clear markup, which often beats flat-rate pricing once volume grows. There is no monthly fee on standard plans, which helps smaller businesses test the model.
Helcim does not match Stripe for developer marketplaces or Square for full retail hardware. Its strength is transparent pricing and solid core processing for online and in-person sales. Businesses that care about effective rate and clear statements should compare Helcim against their current processor with real transaction data.
What we like- Interchange-plus pricing with no monthly fee
- Transparent rate structure
- Good for growing businesses
Watch out for- Fewer marketplace tools than Stripe
- Hardware and POS range is smaller than Square
Starting priceSee website
Free planNo
Shopify Payments is the obvious choice for stores already on Shopify. It removes the need for a separate gateway, avoids Shopify's extra transaction fee for third-party gateways, and keeps payouts and order data in one dashboard. For a new Shopify store, that simplicity saves setup time.
The limit is scope. Shopify Payments only works for Shopify stores, so businesses that sell outside Shopify still need another processor. Rates also vary by Shopify plan, so compare the total cost of the plan plus processing, not processing alone.
What we like- Built into Shopify with no extra gateway setup
- Avoids extra transaction fees on Shopify plans
- Simple store management
Watch out for- Only useful inside Shopify
- Rates depend on your Shopify plan
#8Authorize.net
Best for: Classic payment gateway4.2/5 on
G2 (221 reviews, checked Oct 2026)
Visit authorize.net
Starting priceSee website
Free planNo
Authorize.net has served online businesses for many years as a classic gateway. It connects a website to a merchant account, supports recurring billing and fraud filters, and integrates with many carts and platforms. Businesses with an existing merchant account often keep Authorize.net for stability.
Newer processors offer simpler onboarding and more modern dashboards, and Authorize.net monthly fees can add up for low-volume sellers. For established businesses that already use it and value broad compatibility, it remains a dependable option.
What we like- Long-standing gateway with broad platform support
- Fraud tools and recurring billing
- Works with many merchant accounts
Watch out for- Monthly gateway fee on some plans
- Interface feels dated compared with newer processors
Starting priceSee website
Free planNo
Braintree, owned by PayPal, gives developers a gateway with vaulting, subscriptions, and wallet support. It suits apps and stores that want PayPal and Venmo in checkout without giving up card processing control. The SDKs and documentation are strong for engineering teams.
Braintree pricing is less transparent than Stripe or Square for some accounts, and smaller businesses may find the sales process slower. For developers building a checkout that needs PayPal, Venmo, and cards together, Braintree is a practical, proven choice.
What we like- Developer-friendly gateway
- Supports cards, PayPal, Venmo, and wallets
- Vaulting for repeat payments
Watch out for- Pricing is quote-based for many businesses
- Support and onboarding vary by account type
How we chose
We compared pricing pages, product documentation, and public reviews on G2, Capterra, and Reddit, and checked each processor for online and in-person support, fee structure, payment methods, and business-size fit. We focused on processors widely available to US businesses in 2026, and we used "See website" where pricing is custom or changes by plan. We did not claim hands-on testing. This is not financial advice.
This is not financial advice. Check current fees and contract terms on each vendor pricing page before you switch processors.
How to compare processors on total cost
Headline rates mislead, because card mix, ticket size, refunds, and monthly fees change the real cost. A processor that looks cheap for one business can be costly for another, so compare with your own numbers before you switch.
Calculate your effective rate
Take total processing fees for a recent month and divide by total card volume. That effective rate includes percentage fees, per-transaction fees, and monthly fees, and it is the fairest comparison across flat-rate and interchange-plus models. Run the same math for each quote you receive.
Check what is not in the headline rate
Look for monthly fees, gateway fees, chargeback fees, refund fees, and fees for premium features such as advanced fraud tools. Ask whether international cards, keyed entries, and American Express carry different rates. Small print often explains why two quotes with the same headline rate differ by hundreds of dollars a month.
Test checkout and payouts before you commit
Run test transactions, check payout timing, and review dispute tools before you move live traffic. A processor with slightly higher fees but faster payouts and clearer dispute handling can be better for cash flow. Keep your old processor active during the switch, so you can revert if problems appear.
Frequently asked questions
What is the top rated payment processing software?
Stripe is the top rated choice for most online businesses, because of its developer tools, billing, and marketplace support. Square leads for in-person retail, and PayPal leads for buyer trust at checkout. The best choice depends on how you sell, not on a single rating.
What is the cheapest payment processing software?
There is no single cheapest processor, because cost depends on volume, card mix, and ticket size. Flat-rate processors are simple for low volume, while interchange-plus processors like Helcim often cost less at higher volume. Calculate your effective rate with real transaction data before you choose.
Do I need a monthly fee to accept card payments?
No, many processors, including Stripe, Square, and Helcim, offer plans with no monthly fee. Monthly fees usually appear for gateway services, premium plans, or subscription pricing models. Compare total monthly cost, not just the presence of a fee.
Can I use more than one payment processor?
Yes, many businesses use one processor for online sales and another for in-person sales, or add PayPal beside a main processor for conversion. Using more than one adds reporting work, so weigh the conversion or cost benefit against the extra reconciliation.
How long do payouts take?
Payout timing varies by processor, risk profile, and bank, and typically ranges from one to a few business days for standard accounts. New accounts and high-risk categories may face longer holds. Check payout terms in writing before you rely on a processor for cash flow.
Is it hard to switch payment processors?
Switching is usually straightforward for standard online and in-person setups, but subscriptions, saved cards, and marketplace payouts need planning. Saved payment methods cannot always move between processors, so customers may need to re-enter cards. Plan the switch around billing cycles to reduce disruption.
Sources we checked (9)
- https://www.stripe.com
- https://www.square.com
- https://www.paypal.com
- https://www.adyen.com
- https://www.checkout.com
- https://www.helcim.com
- https://www.shopify.com
- https://www.authorize.net
- https://www.braintreepayments.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.