Stripe has a narrow lead for accepting credit card payments online with a simple, low-fee processor, with Square close behind. Helcim is recommended for growing payment volume or lower per-transaction costs through interchange-plus pricing.
The most popular, simple, and low-fee options to launch with include:
Stripe : The gold standard for online-first businesses. It charges and a standard online rate of . It’s easy to embed via , scales seamlessly if you write code, and works well out-of-the-box with tools like or .[](]()]()
Helcim : If you expect higher or rapidly growing transaction volumes (over $10,000–$50,000/month), Helcim is an alternative that bypasses flat-rate pricing for transparent interchange-plus pricing with no monthly subscription fees , often reducing costs significantly as you scale.
To help narrow down the best fit, tell me:
What platform is your website built on (e.g., WordPress/WooCommerce, Shopify, Wix, custom)?
Do you expect to sell mostly online , or a mix of online and in-person?
Stripe has no setup or monthly fee on standard pricing, and you can use hosted Checkout or no-code Payment Links, so you don't necessarily need to build a payment system yourself.
Square is attractive if you want an all-in-one system for online + physical sales, but its free-plan online rate is currently 3.3% + 30¢, making it more expensive than Stripe for ordinary online card transactions.
PayPal's basic Checkout rate is 2.99% + 49¢; its Expanded Checkout option is 2.89% + 29¢, but the latter has different eligibility/setup considerations.
My pick: Start with Stripe + Stripe Checkout if you have a website or online business. It's inexpensive, requires no monthly commitment, and gives you room to add subscriptions, invoices, payment links, wallets, and other payment methods later.
If you tell me what you're selling (e.g. services, physical products, SaaS, subscriptions) and roughly how much you'll process per month, I can tell you which processor will actually be cheapest for your situation.
For a quick launch with low online credit card processing fees, I’d compare Stripe, Square, PayPal/Braintree, and Helcim. The cheapest option depends on your monthly sales, average order size, whether you use a hosted checkout or a custom website, and how many international or premium cards you accept.
The key is to compare the total cost per transaction, not just the advertised percentage. A processor with a slightly higher rate can still be cheaper if it has no monthly fee, offers easy integrations, or avoids paid checkout add-ons.
Best payment processors to compare
U.S. online payments · Published pricing checked October 2026
1. Helcim
(Best for low fees)
Interchange + 0.50% + $0.25 for online cards at the lowest volume tier
Helcim passes through the underlying interchange costs and adds a published markup. It has no monthly account fee or long-term contract, and its rates improve as your volume grows. Its effective online rate depends on the cards your customers use.
Best for: Small and growing businesses that want to optimize costs without a monthly subscription.
2.9% + $0.30 per successful domestic online card transaction
Stripe offers hosted Checkout, no-code Payment Links, and integrations for many website platforms. There are no standard setup or monthly processing fees.
Best for: Online stores, SaaS, subscriptions, and custom websites. Payment Links are especially convenient if you don't want to build a checkout.
3.3% + $0.30 for online payments on listed Free-plan pricing
Square supports online payment links and integrates payments with its business and point-of-sale tools. Its standard Free plan has no software subscription fee, although paid plans have different pricing.
Best for: Businesses that want to take payments online and in person using one system.
Starting at 2.89% + $0.29 for eligible online card processing
PayPal offers online card acceptance and PayPal-branded checkout. Its standard PayPal wallet transactions have a different, generally higher fee: 3.49% + $0.49.
Best for: Businesses whose customers already use PayPal, or sellers who want to offer it alongside cards.
Lowest potential processing cost: Helcim, especially if you have enough sales volume or a card mix that benefits from interchange-plus pricing.
Fastest flexible launch: Stripe Payment Links or hosted Checkout. You can start accepting payments without building a custom payment form.
Simplest all-in-one business setup: Square, particularly if you also sell in person.
Best if customers prefer digital wallets: PayPal alongside your primary card processor.
One important consideration: a lower processing rate isn't always the lowest total cost. Check refund-fee treatment, international card surcharges, recurring billing charges, chargeback fees, and any ecommerce-platform subscription costs before committing.
Let me narrow it down for your business
The best choice depends heavily on your typical transaction size and sales volume. What are you planning to sell?
For a quick launch combined with low or predictable fees, flat-rate and transparent interchange-plus processors are your best bet. They require minimal configuration, avoid complicated merchant accounts, and can be set up in minutes.
The top payment processors balancing ease of setup and competitive online rates include:
Square*: Best for absolute simplicity and out-of-the-box readiness.
Helcim*: Best for scaling up to lower overall fees while retaining a fast setup.
Online Rate: Interchange-plus pricing, averaging around 0.50% + $0.25 above actual interchange costs for online transactions.
Why it fits: While interchange-plus sounds complex, Helcim makes it transparent and simple to launch. Because you pay true interchange rates plus a small fixed markup rather than a bloated flat rate, your fees drop significantly as your monthly volume increases. They also feature a "Fee Saver" surcharge option to pass processing costs to the customer. Learn more at the Helcim Website.[](https://www.nav.com/blog/free-and-low-cost-credit-card-processing/)
Stax*: Best for established small businesses with higher transaction volume.
Online Rate: Subscription-based wholesale interchange rates paired with a flat monthly membership fee rather than a percentage markup.
If you tell me your estimated monthly sales volume and what platform your website is built on (or if you just need simple payment links), I can calculate which of these options will give you the lowest bottom-line cost.
