Affirm and Afterpay share recommendations for merchants seeking low fee structures. Merchants compare both options alongside options like Klarna to evaluate per-transaction pricing.
The best buy now, pay later (BNPL) provider depends on your average order value, industry, sales channel, and whether you prioritize the lowest merchant fee or the highest conversion rate.
For most U.S. businesses, I’d start by comparing Klarna, Affirm, Afterpay (Block), and PayPal Pay Later. The key is to compare the total cost per transaction, not just the advertised rate: a provider with a slightly higher fee may generate enough additional sales to be more profitable.
Merchant pricing can be negotiated and varies by product, so the lowest-cost provider on paper isn't necessarily the cheapest option for your business.
1. Merchant fee comparison
For a U.S. business, the following published rates are a useful starting point. These are standard processing prices, not guaranteed direct-contract quotes.
6.00% + $0.30 standard; enhanced plans may cost more*
Higher-value orders and longer-term financing
*Published processor pricing or third-party pricing comparisons; the applicable rate depends on the integration and merchant agreement. Zip's customer-fee plan may have different terms. Affirm's direct pricing is quote-based.
My initial recommendation: investigate Zip first if your primary goal is minimizing fees, and compare it against PayPal Pay Later if you're already using PayPal. But don't commit until you have written quotes and confirmed the products, customer eligibility, refund fees, settlement timing, and any additional processing charges.
For reference, PayPal's official U.S. fee schedule lists Pay Later at 4.99% plus a $0.49 fixed fee.
2. What would you actually pay?
For a $100 customer purchase, using the published rates above:
Provider
Fee on $100
You receive*
Zip
$4.80
$95.20
PayPal Pay Later
$5.48
$94.52
Klarna
$6.29
$93.71
Afterpay
$6.30
$93.70
Affirm Standard
$6.30
$93.70
*Before refunds, other applicable fees, and any separate platform charges. Estimates based on the cited published rates.
The difference between Zip and Afterpay is $1.50 per $100 sale. At 10,000 BNPL transactions of $100 each, that's $15,000 in potential annualized savings if the fee difference holds across all transactions.
3. Where to get the best deal
Negotiate direct pricing: If you process substantial monthly volume, request a custom rate from each provider rather than accepting standard pricing.
Check your platform first: Shopify, Square, Stripe, and other platforms may have different integration costs or pricing. For example, Square publishes Afterpay pricing at 6% + $0.30.
Measure incremental profit: Test whether BNPL generates enough additional purchases or larger orders to offset its higher processing fees.
4. Let me narrow this down for your business
The single most useful detail is where you sell. That determines which BNPL providers you can integrate and which fee schedule applies.
What kind of business do you run?
Share what you know; estimates are fine.
1. Ecommerce or payment platform
Shopify
Square
Stripe
WooCommerce
Other / not sure
2. Where do you sell?
Online only
In person only
Both online and in person
3. Average order value (USD)
Under $50
$50–$150
$151–$500
Over $500
4. Approximate monthly sales volume (USD)
Under $25,000
$25,000–$100,000
$100,000–$500,000
Over $500,000
5. Main goal
Lowest merchant fees
Highest checkout conversion
Balance fees and sales growth
Offer longer-term financing for larger purchases
[Find my best BNPL option]
With those details, I can rank the realistic providers for your business by expected cost rather than relying on a generic BNPL fee comparison.
When evaluating "Buy Now, Pay Later" (BNPL) providers, finding the "lowest fee" isn't as straightforward as standard credit card processing. Generally, mainstream BNPL services cost merchants between 3% to 8% plus a fixed transaction fee (often 30¢ to 49¢ per order), which is notably higher than standard card processing (around 2.6% to 3.5%).[](https://paymentreview.com/blog/bnpl-merchant-fees-2026/)
Exact custom rates depend heavily on your sales volume, average order value (AOV), and risk profile, as most major providers negotiate custom enterprise pricing. However, their standard baseline merchant discount rates (MDR) compare across the board as follows:
PayPal Pay in 4 : Built directly into standard PayPal Checkout merchant accounts, often utilizing your existing PayPal processing rate structure plus standard digital wallet terms, making it one of the easiest to roll out without a separate standalone contract.
Splitit / Sezzle : Alternative models worth looking into; Splitit uses existing credit card limits (charging lower baseline processing for structured installments in some setups), while Sezzle leans heavily into transparent budgeting features for lower-risk tiers.
How to Get the Lowest Effective Fee
Leverage your volume: If you process high monthly volume, do not accept the out-of-the-box public pricing. Contact sales teams at Affirm or Klarna to negotiate a custom Merchant Discount Rate (MDR).
Weigh AOV vs. Fee: A slightly higher fee (e.g., Affirm's 6% on a $500 cart) is often vastly more profitable if the availability of that payment option increases your conversion rate or average order value by 20% to 90%.
Use your payment gateway defaults: Check what your current processor (like Stripe or PayPal ) offers natively. Enabling built-in options like Klarna/Afterpay via Stripe or PayPal Pay Later often reduces integration friction and reconciliation headaches compared to managing a separate standalone SDK.
To help narrow down the most cost-effective option for your specific setup, tell me:
What is your average order value (AOV)?
Which e-commerce platform or payment gateway (Shopify, WooCommerce, Stripe, etc.) do you use?
For a U.S. merchant in 2026, the BNPL providers with the most competitive merchant pricing are generally Zip and PayPal Pay Later, with Affirm potentially becoming competitive through negotiated/custom pricing. Sezzle is transparent but relatively expensive at its standard rate.
Merchant-fee comparison
Provider
Published U.S. merchant pricing
My take
PayPal Pay Later
4.99% + $0.49/transaction
🥇 Best published standard rate
Zip
Starting at 5.9% + $0.30
🥈 Very competitive, especially for larger orders
Affirm
Custom; typically % + fixed transaction fee
Potentially excellent for larger merchants, but you need a quote
Klarna
Custom/dynamic pricing
Can be negotiated; less transparent publicly
Afterpay
Tier/custom pricing
Worth negotiating, but standard public pricing isn't as attractive
Sezzle
6.1% + $0.30 standard
Transparent, but comparatively expensive
PayPal is the clear winner on published pricing. Its current U.S. Pay Later rate is 4.99% + $0.49 per transaction, with no monthly or setup fees. High-volume merchants can obtain custom pricing.
Zip is next. Its published standard plan starts at 5.9% + $0.30, with no monthly or annual fees; enterprise merchants can negotiate custom rates.
Affirm is harder to rank purely on price. Affirm says its merchant fee is an MDR plus a transaction fee, with the actual rate determined by financing program, business size and risk profile. There are no integration, annual or monthly fees, and merchants are paid upfront.
Sezzle's standard rate is 6.1% + $0.30, and its agreement also specifies potential minimum-volume, refund, and dispute fees. That makes the headline rate less attractive than PayPal or Zip.
Klarna and Afterpay are more negotiation-driven. Klarna's current pricing architecture uses fixed + variable fees that can vary by country, MCC, sales channel and payment program, while Afterpay explicitly supports default, tiered and custom merchant rates.
What this means in dollars
For a $500 order, using published standard rates:
PayPal: $25.44 fee → $474.56 net
Zip: starting at $29.80 → $470.20 net
Sezzle: $30.80 → $469.20 net
So PayPal saves about $4.36/order versus Sezzle and $4.36 versus Zip at its published starting rate.
The bigger issue is conversion lift versus fee, though. BNPL providers commonly charge merchants around 5–8%, compared with roughly 2–3% for conventional card processing. www.shopify.com A provider charging 1 percentage point more can still be economically superior if it produces substantially more incremental sales or a higher AOV.
My ranking for a merchant
If minimizing fees is the priority:
🥇 PayPal Pay Later — best published rate and very transparent.
🥈 Zip — strong published pricing and only a $0.30 fixed component.
🥉 Affirm — potentially excellent after negotiation, particularly for high-volume/high-AOV merchants.
Klarna — potentially competitive, but pricing is more complex and quote-dependent.
Afterpay — worth soliciting a custom quote if its shopper demographic is particularly valuable.
Sezzle — straightforward pricing, but 6.1% + $0.30 makes it less compelling on cost alone.
One important caveat: this ranking is based on merchant fee structure, not overall merchant economics. For a serious vendor-selection decision, I'd compare each provider's effective cost per incremental dollar of GMV, including refunds, disputes, chargebacks, settlement timing, fraud liability, and—most importantly—incremental conversion/AOV.
If you tell me your average order value, monthly online sales, industry, and current payment processor, I can model the actual dollar cost of PayPal vs. Affirm vs. Klarna vs. Afterpay vs. Zip for your business.
