We want to offer "buy now, pay later" options to our customers. What's the best BNPL provider with the lowest merchant fees?

If you're a U.S. merchant, there isn't one BNPL provider that universally has the lowest fee. Pricing varies substantially by merchant, volume, product category, average order value, and whether you integrate directly or through a payment processor.

My short answer

If minimizing merchant fees is the #1 priority, I'd get quotes from Affirm and Afterpay first, rather than simply choosing the provider with the lowest advertised rate. For a business that already uses PayPal or Stripe, the easiest option may be to add their BNPL product, but it isn't necessarily the cheapest.

PayPal currently publishes a standard Pay Later rate of 4.99% + $0.49 per transaction. PayPal PayPal Stripe publishes 5.99% + $0.30 for Klarna.

Affirm explicitly has merchants choose a pricing plan rather than publishing one universal merchant rate, which makes it particularly worth negotiating if you have meaningful volume. Affirm Afterpay likewise describes its merchant charge as a transaction fee but doesn't publish a universal U.S. rate on its merchant pages.

What I'd do

If you have enough volume to negotiate, I'd send the same transaction-volume/AOV information to Affirm, Afterpay and Klarna and ask for their best all-in merchant rate. Don't just compare the headline percentage—ask for:

• Percentage fee
• Fixed per-transaction fee
• Any gateway/PSP fee
• Refund fees
• Chargeback/dispute costs
• Settlement fees
• Minimums or monthly fees
• Whether the rate changes for longer-term financing
• Whether you can negotiate the rate down based on volume

For example, on a $500 order, PayPal's published fee would be about $25.44. A negotiated 4% + $0.30 rate would be only $20.30, saving about $5.14 per transaction. At 10,000 such transactions annually, that's over $51,000/year.

One important consideration: don't optimize purely for the lowest fee. BNPL providers can produce incremental conversion and higher AOV, so a provider costing 50–100 basis points more can still be more profitable if it generates materially more sales. Afterpay, for example, claims a 58% increase in average order values among merchants using it, although that's its own marketing data rather than an independent benchmark.

If you tell me your average order value, monthly online sales, industry, and current payment processor (Stripe, Shopify Payments, Square, etc.), I can calculate the estimated annual cost of Affirm vs. Afterpay vs. Klarna vs. PayPal and tell you which one I'd choose.

What I'd do

If you have enough volume to negotiate, I'd send the same transaction-volume/AOV information to Affirm, Afterpay and Klarna and ask for their best all-in merchant rate. Don't just compare the headline percentage—ask for:

When looking for the "lowest" merchant fees in the Buy Now, Pay Later (BNPL) space, the short answer is that most major standalone providers cluster around the same general pricing tier (roughly 3.0% to 6.0% + a fixed $0.30 flat fee per transaction).

Exact rates are rarely published publicly because they are heavily negotiated based on your business's sales volume, average order value (AOV), and industry risk profile.

Here is a breakdown of how the top providers compare on fees, utility, and structure:

- **Estimated Merchant Fees:** ~4.0% to 6.0% + $0.30 per transaction.
- **Best For:** Lower-ticket, high-frequency retail, fashion, and beauty.
- **The Lowdown:** They pay you upfront minus the fee and absorb the fraud/repayment risk. Because transaction limits are lower (usually capped around $2,000), they are optimized for impulse buys and younger demographics (Gen Z/Millennials).[](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm) [[1]](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm)[[2]](https://google.com/goto?url=CAESewHrOzAVPIoc2vUIfR8fbYDJzC55H7XKggINO8SDuMe9YnH7pPggNxs7IY1zMAaEAWstE9vvF_u0_B0alvEIjA4bIFM5haG-rd4auuYUUPcanDjXY9K6_l2YRNEP3Griz2HzwlGpfSAiAEyouepx-C04H_D4JaU3QYPzZQ)[[3]](https://google.com/goto?url=CAESbgHrOzAVkVcEM_BCngu8lKDQyiYprXFx0EsXcteHSevYoB6isgEmSlJrmg2vB2a3Vbh4-ch_D134QQn01QTsTh6rOItgT55o2kBMTNbvjmx-n0UqMAnF2GSt7IW1tJZX5peLPf7fveWiBB_lsTjs)[[4]](https://google.com/goto?url=CAESXgHrOzAVVCwY_keiEaHwREQW5AMNzAvCCRnao8Q2Njcrcth0pFSdq7wzd-FtvoUtuMhECpnmamHGcLnciAj-49GFh_F_bKwvfj9tD5RDfDCtkJd-OUw__EtRy1HwZKA)[[5]](https://google.com/goto?url=CAESTwHrOzAVEPXb11OWiSQOsH0Ejtb8WsKssa8o8sXaJZM3KgKx76dY-eBAVTH_PVJLsoBVwFqPF5yoZ6EjQGl8nQZ64ecfGMsrHLh7eoAwJUA)

- **Estimated Merchant Fees:** ~3.0% to 5.99% + $0.30 per transaction (depending on whether it's Pay-in-4 or longer-term financing).
- **Best For:** Global brand recognition and flexible consumer choices.
- **The Lowdown:** Klarna has massive global reach and deep integrations across almost all major e-commerce platforms. Their baseline "Pay in 4" fee can be competitive, but customized financing tiers will scale the fees up.[](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm) [[1]](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm)[[2]](https://google.com/goto?url=CAESewHrOzAVPIoc2vUIfR8fbYDJzC55H7XKggINO8SDuMe9YnH7pPggNxs7IY1zMAaEAWstE9vvF_u0_B0alvEIjA4bIFM5haG-rd4auuYUUPcanDjXY9K6_l2YRNEP3Griz2HzwlGpfSAiAEyouepx-C04H_D4JaU3QYPzZQ)[[3]](https://google.com/goto?url=CAESWwHrOzAVFvX_EJCpXvGrmBlUrle_8pUiuiO1hLNaTaz63iIFyaSpz0a9ZtuX1juRNrS7VjimA0IWjZv1VNUfXBEF8gbofVdlwUC9rI6_GTKEDY784ulw4bhinMw)[[4]](https://google.com/goto?url=CAESVAHrOzAVzIgerFA2KlyEb3fEvyCDYjldDH_kdrzOGO8TtHA9-4TS-oe_9PZdUj4IK8ZouRzBMHjsuIMdR73H1DuEpMS4CzXKU9P4rygV5PjqQws14g)[[5]](https://google.com/goto?url=CAEScQHrOzAVoWJtAed-9l6wdB3ErOqmJ5bnJdaZ9tQgiOJKPekyT8Nlp_C-4ooLqhJCRAK9IsV3ArZ3YWNlpobkZU74LV_aNOOr6kuSD74cEM5DC35EgbnTae7T-JOVf-lPnCbeNK-2g6Niva2qsClYgK5i)

- **Estimated Merchant Fees:** ~3.0% to 6.0% + variable flat fees.
- **Best For:** Higher-ticket items (electronics, furniture, travel).
- **The Lowdown:** Affirm is built for larger purchases (financing up to thousands of dollars). They offer transparent terms with zero late fees for consumers, but their merchant fees lean toward the higher end of the spectrum unless you negotiate enterprise volume pricing.[](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm) [[1]](https://google.com/goto?url=CAESTQHrOzAV74t9FgmRcNJw98ZUJS_NTBl5wskB7NtzJB2elwR4lFKQgTuAILNT745ULl4qN3aeeKuwZbjcoYNccMutlrXQzjeoqUhAeipm)[[2]](https://google.com/goto?url=CAESewHrOzAVPIoc2vUIfR8fbYDJzC55H7XKggINO8SDuMe9YnH7pPggNxs7IY1zMAaEAWstE9vvF_u0_B0alvEIjA4bIFM5haG-rd4auuYUUPcanDjXY9K6_l2YRNEP3Griz2HzwlGpfSAiAEyouepx-C04H_D4JaU3QYPzZQ)[[3]](https://google.com/goto?url=CAESXwHrOzAValHNsZ50_Y9sTzyHqUTx8WLrOX9lnlLJv0gmnAo2S8-XZ8R5WzJYlmEQ7V0he-kbhC6Qoox6a1GvOhNMFbjF8Kc3RUeM0a94LbthzLuTZG9XqeKxWLb-wvCT)

- **Estimated Merchant Fees:** Standard PayPal processing rates (typically around 2.59% to 3.49% + fixed fee depending on your setup) for the basic Pay in 4 product in many regions.
- **Best For:** Small-to-midsize businesses already using PayPal checkout.
- **The Lowdown:** Often the most cost-effective route if you already use PayPal as a gateway, because you don’t necessarily have to sign a separate complex enterprise BNPL contract. Users also heavily trust the PayPal brand.[[1]](https://google.com/goto?url=CAESXwHrOzAV3YVBNVjOJw9SLKTz9INbtCwKHIpH8KoRVCUIsRh26afZId44jzHHRY4reZHvG-7BDVR0AXjzjcOXWA2XuGaaeyKW4tn3_ghb9Lag5NpMdHVcCCS7NjqGxziu)[[2]](https://google.com/goto?url=CAESYAHrOzAVWx1nq8T-u8L_xW198sxz3uPtn--UtHRHCJB8MZGciTG926I9j1sHRQeHfRJew9-oMlKYOI9iCA7IYQjp0wPxvae7coJU9OBmh_fjNPmejxxjLxpD1p1qb41j9w)[[3]](https://google.com/goto?url=CAESsgEB6zswFefCjiialF6TIPh99LDClTj-uNgGvvGAuMJ8dRRnYsWgZ6hssPVw32i7KqFH3-ctXcGPHAfhXRvw6FKMHhIcgCI3OmmamrLdjjikwc_SVvD6KgdBEvWoklHD6EyTGQDKOCRoSdB_Spz9iCyFpmSYbNuH8IOK8lYr73eXYJeAo4LSG2dJBktKNszMdczMSXNR5-rpHbLvU7jp_Fr02EWZCKyv7teyW-hduAsfQhNW)[[4]](https://google.com/goto?url=CAESmQEB6zswFVa0SRqGSLXIBB7gKeLYK9yEDK_Ex1p-7EVkSSa_U9r1O9waXg3gIEOt8t1rsK0yQkW1UUJqlJXy896WqFjTgUyhzY-G5tu7ErQcof1a1UZNec75gLCcVe4rkrI2rop6Ci0ONdgkFm0lfLtdkkYGKSVv5aFC016r7CTSIokQVN-KwZasitGmblLu0xlK4wpbz9JRarw)[[5]](https://google.com/goto?url=CAESVAHrOzAVzIgerFA2KlyEb3fEvyCDYjldDH_kdrzOGO8TtHA9-4TS-oe_9PZdUj4IK8ZouRzBMHjsuIMdR73H1DuEpMS4CzXKU9P4rygV5PjqQws14g)

How to Actually Get the Lowest Fees

• Leverage Your E-commerce Platform: If you use Shopify, check out Shopify Payments or native integrations for Shop Pay Installments (powered by Affirm) or Klarna, which sometimes offer streamlined rates that bypass custom enterprise setup costs.
• Volume Negotiation: If your monthly GMV (Gross Merchandise Value) is high, do not accept standard tier rates. Reach out to sales teams at Affirm, Klarna, or Afterpay directly to negotiate a custom blended rate.

To narrow down the best fit, tell me:

• What e-commerce platform are you using (Shopify, WooCommerce, custom, etc.)?
• What is your average order value (AOV)?

I can help you pinpoint which provider makes the most financial sense for your margins.

When choosing a "Buy Now, Pay Later" (BNPL) provider, finding the "lowest merchant fee" isn't a one-size-fits-all answer. Most standard short-term BNPL products (Pay in 4 models) cluster around 3% to 6% + a small flat fee (usually$𝟎.𝟑𝟎) per transaction . Your exact rate heavily depends on your sales volume, industry risk, and whether you negotiate a custom enterprise contract.

A breakdown of the major providers, their general merchant fee structures, and what they do best includes:

1. PayPal Pay in 4 / Pay Monthly
   • Merchant Fee: Standard PayPal processing rates (typically around 3.4 9%+$0.4 9 for online transactions, with no additional surcharges to offer the BNPL feature itself if you already use PayPal Checkout).
   • Best For: Small-to-medium businesses already integrated with PayPal. Because it leverages your existing gateway setup, it’s often the most cost-effective and familiar route without managing a separate contract. Learn more via PayPal Business Solutions.
2. Afterpay (Block)
   • Merchant Fee: Roughly 4%t o 6%+$0.3 0 per transaction (custom pricing for high-volume enterprise).
   • Best For: Retail, fashion, beauty, and lower-to-mid ticket items (<is less than<$2,0 0 0 ) targeted at mobile-first and Gen Z shoppers. They pay you upfront minus the fee while shouldering the consumer default risk.
3. Klarna
   • Merchant Fee: Varies widely from 3%t o 5.9 9%+$0.3 0 depending on the specific financing product (Pay in 4 vs. monthly financing) and your tier.
   • Best For: Global reach and brand recognition. Klarna is a powerhouse for conversion rates, though its multi-layered fee structure can be complex.
4. Affirm
   • Merchant Fee: Typically 3%t o 6%+$0.3 0 , scaling higher for long-term, 0% APR, or high-ticket promotional financing.
   • Best For: High-ticket items (furniture, electronics, travel) where basket sizes can stretch up to several thousand dollars.
5. Sezzle / Zip
   • Merchant Fee: Generally competitive around 4%t o 6%, but Sezzle is often noted as being friendlier and more accessible for smaller emerging merchants or niche e-commerce setups.

Summary Recommendation

If you want the lowest barrier and overhead , sticking with PayPal Pay in 4 via your current checkout integration avoids extra standalone BNPL platform fees. If you want specialized standalone conversion power for specific demographics, you will need to reach out to Afterpay or Klarna directly to leverage your sales volume for a custom sub-5% negotiated rate.

To help narrow down the most cost-effective provider, tell me:

• What is your average order value (AOV)?
• Which e-commerce platform are you using (Shopify, WooCommerce, custom)?

If you're in the U.S., PayPal Pay Later is currently the strongest candidate if your priority is minimizing merchant fees, especially if you already use PayPal Checkout.

BNPL fee comparison

PayPal's current U.S. pricing page explicitly lists Pay Later at 4.99% + $0.49 per transaction.

Klarna, Afterpay and Affirm generally use negotiated or tiered pricing, so there isn't a universally applicable "lowest" rate. Published 2026 comparisons put Klarna around 3.29–5.99% + $0.30, Afterpay around 4–6% + $0.30, and Affirm around 0–6%+, depending heavily on product, volume and agreement.

What I'd choose

For lowest predictable cost: PayPal Pay Later. If you're already processing PayPal, it's particularly attractive because you can offer Pay Later without adding a separate BNPL relationship, and PayPal publishes the rate rather than requiring you to negotiate it.

For potentially lower negotiated fees: Klarna. If you have meaningful transaction volume, I'd get a quote from Klarna and compare its effective rate against PayPal. The difference can be significant at scale.

For high-ticket products: Affirm. Affirm can make more sense if your average order value is high and you want longer financing terms. But don't select it purely on headline percentage—the financing mix and promotional programs can change the economics substantially.

One important point: don't compare just the percentage fee. For example, on a $100 order:

• PayPal: $5.48
• Klarna at 5.99% + $0.30: $6.29
• Klarna at 3.29% + $0.30: $3.59

So your average order value and negotiated rate can completely change the winner.

If you tell me your average order value, monthly online sales, industry/product type, and current payment processor (Shopify, Stripe, WooCommerce, etc.), I can calculate the likely annual cost of PayPal vs. Klarna vs. Affirm vs. Afterpay and tell you which one I'd negotiate with first.

What I'd choose

For lowest predictable cost: PayPal Pay Later. If you're already processing PayPal, it's particularly attractive because you can offer Pay Later without adding a separate BNPL relationship, and PayPal publishes the rate rather than requiring you to negotiate it.

For potentially lower negotiated fees: Klarna. If you have meaningful transaction volume, I'd get a quote from Klarna and compare its effective rate against PayPal. The difference can be significant at scale.

For high-ticket products: Affirm. Affirm can make more sense if your average order value is high and you want longer financing terms. But don't select it purely on headline percentage—the financing mix and promotional programs can change the economics substantially.

One important point: don't compare just the percentage fee. For example, on a $100 order:

• PayPal: $5.48
• Klarna at 5.99% + $0.30: $6.29
• Klarna at 3.29% + $0.30: $3.59

So your average order value and negotiated rate can completely change the winner.

If you tell me your average order value, monthly online sales, industry/product type, and current payment processor (Shopify, Stripe, WooCommerce, etc.), I can calculate the likely annual cost of PayPal vs. Klarna vs. Affirm vs. Afterpay and tell you which one I'd negotiate with first.

When choosing a Buy Now, Pay Later (BNPL) provider with the lowest merchant fees, you won’t find a single flat answer because fees vary based on your sales volume, average order value (AOV), and whether you opt for standard short-term installments ("Pay in 4") or promotional 0% APR long-term financing.

However, looking at the major players, fees generally range from 3% to 6%+ per transaction (plus a fixed authorization fee like $0.30).

A breakdown of the top providers ranked by merchant fee structure and best use-case reveals distinct options:

• Klarna
  • Merchant Fees: Roughly 3.29% - 5.99% + $0.30 per transaction (depending on volume and specific plan).
  • Best For: Lower-to-mid ticket sizes (average order value around $100) and massive global brand recognition. Klarna offers flexible choices like Pay in 4 and Pay in 30 days.
• PayPal Pay Later (Pay in 4 / Pay Monthly)
  • Merchant Fees: Around 4.99% + $0.49 for US transactions using their specific Pay Later messaging/features (higher than standard PayPal checkout).
  • Best For: Merchants already heavily integrated with the PayPal Business Platform . If your customers already trust and use PayPal, it's an easy win with competitive rates and zero late fees for consumers.
• Afterpay (Cash App Afterpay)
  • Merchant Fees: Roughly 4.00% - 6.00% + $0.30 per transaction.
  • Best For: Fashion, beauty, and lifestyle brands targeting Gen Z or millennial demographic groups. Their classic Pay-in-4 model drives high conversion for impulse buys.
• Affirm
  • Merchant Fees: Higher end, typically starting around 6.00% + $0.30 (and scaling higher if you subsidize 0% APR promotional interest for big-ticket items).
  • Best For: Higher average order values (furniture, electronics, travel—AOV $250+). While the fee percentage is steeper, the lift in average order value often offsets the cost.
• Shop Pay Installments (Powered by Affirm)
  • Merchant Fees: Aligned closely with Affirm’s standard processing rates, but natively baked into Shopify.
  • Best For: E-commerce stores running on Shopify. It provides the lowest friction setup if your store is already on the platform.

To help narrow down the most cost-effective provider, tell me:

• What is your average order value (AOV)?
• What e-commerce platform are you using (Shopify, WooCommerce, custom, etc.)?
• What type of products do you sell?

If you're a U.S. merchant, there isn't one universally cheapest BNPL provider—the rate depends heavily on your volume, average order value, industry, and whether you subsidize promotional financing.

My short answer

Klarna is probably the first provider I'd negotiate with if your primary goal is low merchant fees. Public 2026 pricing data puts Klarna around 2.99%–5.99% + $0.30, with the lower end generally tied to higher-volume arrangements.

Stripe currently publishes 6% + $0.30 for both Affirm and Cash App Afterpay, while noting that some merchants may receive temporarily reduced rates. stripe.com PayPal's current published Pay Later rate is 4.99% + $0.49 with no setup/monthly fees, and high-volume merchants can negotiate custom pricing.

What I'd do

If you have meaningful volume, don't simply accept the standard advertised rate. Get quotes from Klarna, Affirm, and Afterpay and ask each for:

• Merchant discount rate
• Per-transaction fee
• Any minimums/monthly fees
• Rates for Pay-in-4 vs. longer-term financing
• Chargeback/fraud liability
• Settlement timing
• Volume-based pricing
• Whether you can offer multiple BNPL providers simultaneously

For example, on a $500 order, the difference between 3% + $0.30 and 6% + $0.30 is $15 per transaction. At 1,000 BNPL orders/month, that's $15,000/month in gross processing-cost difference.

One important point: the lowest fee isn't necessarily the cheapest BNPL solution overall. A provider charging 5% that produces substantially more incremental conversions or higher AOV can be more profitable than one charging 3%. BNPL merchant fees are generally materially higher than ordinary card processing.

If you tell me your industry, average order value, monthly online sales, and current payment processor (e.g. Stripe, Shopify Payments, Square, etc.), I can compare the major BNPL providers and estimate your actual monthly cost and which one is likely to maximize profit.

When looking for the "lowest merchant fees" in the Buy Now, Pay Later (BNPL) space, the short answer is that rates typically range from𝟑.𝟐𝟗%𝒕𝒐𝟔%+$𝟎.𝟑𝟎 per transaction for standalone major providers. However, the lowest nominal fee doesn't always equal the best value, as fees vary drastically based on your average order value (AOV), target audience, and customized volume tier negotiations.

A comparison of the major players' standard merchant fee structures reveals how they stack up:

• Klarna : Fees generally range from 3.2 9%−5.9 9%+$0.3 0 per transaction. Best suited for lower-to-mid ticket sizes (<$2 0 0 ) and high-frequency or global e-commerce. Their baseline starting rates for simple "Pay in 4" tend to be slightly more aggressive than Affirm.
• Afterpay (Block) : Fees hover around 4%−6%+$0.3 0 per transaction. Highly popular for younger, mobile-first, fashion/lifestyle demographics with low average order values.
• PayPal Pay Later / Pay in 4 : Fees are tied into your standard PayPal business account ecosystem, usually running around 4.9 9%+$0.4 9 for US Pay Later transactions. This is often the easiest route if your checkout already heavily relies on PayPal Merchant Services.
• Affirm : Fees range from 2.5%−8%, but standard promotional or 0% APR plans typically land around 6%+$0.3 0 . While they have higher headline fees, they specialize in much higher average order values (>$2 5 0−$5 0 0+), meaning the higher percentage often scales effectively with big-ticket items.
• Smaller/Niche Players (e.g., Sezzle, Zip) : Can occasionally negotiate lower starting baseline tiers depending on your risk profile, but lack the massive built-in user base and consumer brand recognition of Klarna or PayPal.

Key Factors Beyond the Fee Percentage

1. Custom Volume Pricing : If you process high enterprise volume (>$1 0 0 k+/month), none of these public rates apply. You can negotiate custom "take rates" directly with Klarna or Affirm.
2. Platform Blended Rates : If you use Shopify Payments , using built-in options like Shop Pay Installments or integrated gateway options via Stripe Pricing can streamline your tech stack, though you'll want to check if their bundled BNPL rates match direct deals.
3. Conversion vs. Cost : A provider charging 5% that lifts your checkout conversion or average order value by 2 0% yields a net-positive ROI compared to a cheaper provider customers don't recognize.

To help narrow down the most cost-effective option, tell me:

• What is your average order value (AOV)?
• What e-commerce platform are you using (Shopify, WooCommerce, custom, etc.)?
• What is your approximate monthly sales volume?

If you're a U.S. merchant, there isn't one universally cheapest BNPL provider—the rate usually depends on your volume, average order value, industry, and integration. But based on currently published pricing, Zip is the strongest candidate if minimizing merchant fees is your top priority.

A couple of important nuances:

• PayPal actually has the lower headline percentage (4.99% vs. Zip's 5.9%), but its fixed fee is $0.49 rather than $0.30. PayPal explicitly says high-volume merchants can receive custom pricing.
• Zip's published standard rate starts at 5.9% + $0.30, with no monthly or annual fee; enterprise merchants get custom pricing.
• Afterpay doesn't publish a standard U.S. merchant rate on its current merchant signup page; it says merchants pay a transaction fee and receive the purchase amount upfront.
• Affirm also emphasizes customized pricing, and its value proposition is particularly compelling if you're selling higher-ticket goods because it offers longer installment terms.

What I'd do

If your goal is lowest total cost, I'd get quotes from Zip, PayPal, and Afterpay, then negotiate using your actual volume. Don't choose solely on the advertised percentage.

For example, on a $500 order:

• Zip at 5.9% + $0.30 → $29.80
• PayPal at 4.99% + $0.49 → $25.44

So PayPal wins on that example despite its higher fixed fee.

But there's another consideration: incremental sales. A provider costing 1–2 percentage points more can still be more profitable if its customer base materially increases conversion/AOV. Affirm, for example, reports that its merchants see substantial AOV and conversion benefits, although those are provider-reported figures rather than guarantees.

Bottom line: If you're optimizing strictly for merchant fee, I'd start negotiations with PayPal and Zip, with Afterpay/Affirm as competitive quotes. If you tell me your average order value, monthly online sales, industry, and ecommerce platform (Shopify/WooCommerce/custom/etc.), I can calculate the expected annual cost for each and tell you which is likely cheapest for your business.

If your #1 priority is the lowest merchant cost, I would not automatically choose Affirm, Klarna, or Afterpay. Their pricing is generally negotiated/custom, so there isn't one provider that is universally cheapest.

My shortlist for a U.S. merchant

The important caveat is that third-party published comparisons are only estimates; the major BNPL providers don't all publish standardized merchant rates.

PayPal is the one I can verify directly: its current U.S. merchant pricing is 4.99% + $0.49 per Pay Later transaction, with no setup or monthly fee, and high-volume merchants can request custom pricing.

For example, on a $100 order, PayPal's published Pay Later fee is $5.48, leaving you $94.52 before other applicable costs.

What I'd do

If you're a small/midsize merchant, I'd get quotes from Klarna, Affirm, and Afterpay, then use PayPal's 4.99% + $0.49 as your benchmark. Ask each provider for:

• percentage fee
• fixed transaction fee
• refund/chargeback fees
• payout timing
• whether you pay additional processing fees
• minimum/maximum transaction size
• whether longer-term financing costs more
• volume discounts

Don't choose solely on the lowest percentage. A provider charging 5.5% can be substantially more profitable if it increases conversion/AOV enough to offset the extra 1–2 percentage points.

If you tell me (1) what you sell, (2) your average order value, (3) monthly online sales, and (4) Shopify/WooCommerce/custom checkout, I can compare the major BNPL providers and estimate the actual dollar cost per month and break-even conversion lift for your business.

When looking for the "best" Buy Now, Pay Later (BNPL) provider with the lowest fees, the short answer is that standard BNPL merchant fees are remarkably uniform across major brands, typically ranging from 3%t o 6% plus a fixed transaction fee (often around$0.3 0).

Because list prices are similar, the "lowest fee" actually comes down to your sales volume negotiation, average order value (AOV) , and existing e-commerce stack.

Standard Fee Comparison (Base Rates)

• Klarna
  • Merchant Fee:∼3.2 9%t o 5.9 9%+$0.3 0
  • Best for: Lower-to-mid-ticket items ($50 to $500), high global/EU brand recognition.
• Affirm
  • Merchant Fee:∼3%t o 6%+$0.3 0
  • Best for: Higher-ticket items ($300 to $5,000+). Note that for longer-term, interest-bearing loans, the consumer's interest can sometimes subsidize the merchant cost.
• Cash App Afterpay
  • Merchant Fee:∼4%t o 6%+$0.3 0
  • Best for: Gen Z/Millennial fashion and beauty, straightforward "Pay in 4" structures.
• PayPal Pay Later
  • Merchant Fee: Standard PayPal processing rates or around 4.9 9%+$0.4 9 depending on specific integration.
  • Best for: Immediate trust and leveraging an existing PayPal checkout workflow.

How to Get the Lowest Effective Fees

1. Leverage Platform Defaults (Shopify / Stripe): If you use platforms like Shopify, enabling native options like Shopify Installments (powered by Affirm) or integrated Stripe/PayPal options reduces setup friction and sometimes offers tiered processing rates that beat standalone enterprise contracts.
2. Negotiate on Volume: If you process high monthly GMV (Gross Merchandise Value), none of the published baseline rates apply. Reach out to the sales teams at Klarna or Affirm directly; enterprise merchants routinely negotiate custom blended rates closer to the 2.5%t o 3.5% range.
3. Match the Provider to Your Average Order Value (AOV): Choosing a mismatch can indirectly hurt your margins. If you sell low-cost items, a high-ticket financing specialist like Affirm won't convert as well, driving up your effective customer acquisition cost. Conversely, if you sell high-ticket goods (1,0 0 0+), "Pay in 4" providers might struggle with approvals or fail to close the sale.

To help narrow down the most cost-effective provider for your setup, tell me:

• What is your platform/cart software (e.g., Shopify, WooCommerce, custom)?
• What is your average order value (AOV)?
• What is your estimated monthly processing volume?