For most third-party sellers, Amazon has been the default first move — and often the only move. But Walmart Marketplace has quietly closed the operational gap in ways that matter to a P&L. As of Q1 2026, Walmart’s third-party GMV hit an estimated $28.4 billion annualized, up from roughly $20 billion in 2024, according to data cited in Walmart’s most recent investor call. Meanwhile, Amazon’s third-party services revenue — the line item most reflective of seller fees and ad spend — grew 11% year-over-year to $156.8 billion in 2025.
The divergence in growth rates is what’s getting attention. Sellers who were running 100% Amazon-native strategies 18 months ago are now actively testing Walmart as a margin-recovery play, particularly as Amazon’s referral fees and Sponsored Products CPCs have eroded profitability across categories like home goods, sporting equipment, and consumables.
“We moved 12 SKUs to Walmart Marketplace in January and we’re averaging a 6-point ROAS improvement on advertising spend versus the same SKUs on Amazon,” said Marcus Leighton, founder of Lakewood Outdoors, a Colorado-based camping gear brand doing approximately $4.2M annually. “The competition density on Walmart is still thin enough that we’re winning on organic placement without the PPC overhead.”
How do the fee structures actually compare in 2026?
Fee structure is where the operational math starts diverging sharply. Amazon’s referral fees have crept upward across key categories — apparel now carries a 17% referral fee on items over $20, and the FBA fee stack (fulfillment + storage + low-inventory surcharge + returns processing) can consume 35-45% of revenue for mid-sized sellers in peak months. Walmart’s referral fees range from 6% to 15% depending on category, with no equivalent to Amazon’s low-inventory fee or the Q4 peak storage surcharge.
Walmart Fulfillment Services (WFS) pricing has also been restructured. As of February 2026, WFS charges $3.45 to fulfill a standard item under 1 lb — compared to Amazon’s FBA rate of $4.09 for a comparable unit. Storage fees at Walmart run $0.75 per cubic foot monthly versus Amazon’s $0.87 (non-peak). The gap widens further when you factor in Amazon’s aged inventory surcharge, which kicks in at 181 days and can reach $6.90 per cubic foot.
“The fee differential is real, but sellers are underestimating how much Amazon’s advertising ecosystem subsidizes organic ranking. On Walmart, organic is still winnable. On Amazon in competitive categories, you’re essentially paying rent to rank.” — Carrie Holt, VP of Marketplace Strategy at Tinuiti
Which platform offers better advertising ROI for third-party sellers?
Amazon Advertising remains the larger and more sophisticated machine. Sponsored Products, Sponsored Brands, and Sponsored Display together generated an estimated $56 billion in ad revenue for Amazon in 2025. The targeting depth — keyword match types, ASIN targeting, audience retargeting via DSP — is unmatched. But CPCs in high-volume categories have reached levels that compress margins for anyone below a 60% gross margin. In the supplement and beauty categories, average CPCs on competitive head terms now routinely exceed $2.80, according to reporting from Skai’s Q1 2026 marketplace benchmark report.
Walmart Connect, by contrast, is running average CPCs of $0.55-$0.85 across most categories, per data from Perpetua’s 2026 Marketplace Advertising Index. The tradeoff is reach — Walmart.com draws roughly 500 million monthly visits versus Amazon’s estimated 2.4 billion — but the conversion rate on Walmart’s search is often higher for products that already have brand recognition, because buyers there tend to be further down the funnel.
- Amazon Sponsored Products avg. CPC (2026): $1.20–$2.80 depending on category
- Walmart Connect avg. CPC (2026): $0.55–$0.85 across most categories
- Amazon DSP minimum spend: $35,000/month managed service
- Walmart DSP minimum spend: $15,000/month via The Trade Desk integration
- Amazon attribution window: 14-day click, 14-day view
- Walmart attribution window: 30-day click (as of January 2026 update)
How does onboarding and catalog management compare?
Amazon’s Seller Central remains the more feature-rich but also more punishing environment. Account health metrics — Order Defect Rate below 1%, Late Shipment Rate below 4%, Valid Tracking Rate above 95% — are strictly enforced, and suspension appeals remain a costly, time-consuming process even after Amazon introduced its Seller Reactivation Guarantee program in late 2025. The Listing Quality Dashboard, rolled out in Q4 2025, added another layer of compliance burden, flagging issues with title length, image counts, and A+ content gaps.
Walmart Seller Center has made notable usability improvements since its 2024 redesign. Bulk listing via flat file is faster, and the integration with Walmart’s Item Spec API 4.0 has reduced catalog errors for sellers managing 500+ SKUs. However, Walmart’s category approval process still creates friction — categories like electronics and health require pre-approval that can take 5-10 business days. Amazon’s open catalog model remains more permissive for new entrants.
“Walmart’s onboarding has gotten meaningfully better, but the seller support infrastructure isn’t there yet. When something goes wrong with a WFS shipment, you’re waiting 3-4 business days for resolution. Amazon Seller Support is frustrating, but at least it’s 24/7.” — Derek Osman, director of marketplace operations at Brandlance Agency
What does the Buy Box and pricing algorithm look like on each platform?
Amazon’s Buy Box algorithm — now officially rebranded as the “Featured Offer” — continues to weight fulfillment method heavily. FBA sellers win the Featured Offer roughly 82% of the time in contested listings, according to internal benchmarking data cited by SellerEngine. Price competitiveness, seller rating, and in-stock rate round out the main variables. Amazon’s automated pricing rules have also become more aggressive; sellers not using a repricer are increasingly finding themselves displaced even when their prices are within 1-2% of the winning offer.
Walmart’s equivalent — the Buy Box or “Add to Cart” button winner — uses a simpler scoring model that weights price, item condition, WFS usage, and seller performance score. Because Walmart’s marketplace is less saturated, many sellers find they can win the Buy Box without WFS participation, which gives FBM-equivalent sellers more runway than they’d have on Amazon. Repricing tools including Feedvisor, Wiser, and Informed.co all now support Walmart natively.
Which platform is better for new product launches and ranking velocity?
Amazon’s ranking ecosystem rewards velocity — units sold, conversion rate, review count, and PPC investment all feed the A9/A10 algorithm. A new product launch without a review base and an initial PPC budget of at least $50-$100/day is functionally invisible in competitive categories. The “Vine” review program costs $200 per parent ASIN and generates up to 30 reviews, but has become table stakes rather than a differentiator.
Walmart’s ranking algorithm is less review-dependent and more inventory-availability-weighted. A product with zero reviews can rank on page one if it’s priced competitively, has complete content, and is in-stock via WFS. This creates a meaningful first-mover window for sellers entering Walmart before category competition intensifies. Rachel Nguyen, head of growth at Thrive Commerce Consulting, has been advising clients to treat Walmart launches the way Amazon launches worked in 2018 — lean on organic before competition catches up.
“We tell every client with 3.5 stars or higher on Amazon: your catalog is ready for Walmart. You don’t need to rebuild anything. The barrier to ranking there in 2026 is still low enough that disciplined operators can dominate a subcategory in 60-90 days.” — Rachel Nguyen, head of growth, Thrive Commerce Consulting
| Metric | Amazon Seller Central | Walmart Seller Center |
|---|---|---|
| 3P GMV (2025 est.) | ~$650B+ | ~$28.4B annualized |
| Monthly site traffic | ~2.4B visits | ~500M visits |
| Referral fees (apparel) | 17% (items over $20) | 15% (items over $20) |
| Fulfillment fee (1 lb standard) | $4.09 (FBA) | $3.45 (WFS) |
| Monthly storage (per cu ft) | $0.87 | $0.75 |
| Avg. Sponsored Products CPC | $1.20–$2.80 | $0.55–$0.85 |
| Review program | Vine ($200/ASIN, up to 30 reviews) | Review Accelerator (cost-per-review model) |
| Seller support hours | 24/7 | Business hours (M–F) |
| Repricer integrations | Feedvisor, Informed.co, BQool, Wiser | Feedvisor, Informed.co, Wiser |
| Active 3P sellers | ~2M+ active sellers | ~150,000 sellers |
Which platform should you prioritize in 2026?
The honest answer is both — but in a sequenced, resource-aware way. Amazon remains non-negotiable for discovery-stage products where search intent volume is the primary growth lever. If you’re launching a new brand with no existing audience, Amazon’s 2.4 billion monthly visits and deep buyer intent signals are irreplaceable. The cost of acquiring customers through Amazon’s flywheel — even at today’s CPC levels — is still lower than cold-traffic acquisition on Meta for most product categories.
Walmart is the intelligent expansion play for sellers who already have proven Amazon listings with 50+ reviews, a stable conversion rate above 12%, and FBA infrastructure in place. WFS accepts your existing FBA prep standards in most cases, and multichannel listing tools like Listing Mirror, Sellbrite, and ChannelAdvisor make syndicating your catalog operationally straightforward. The margin recapture — lower fees, lower ad costs — can fund further Amazon investment, creating a compounding advantage rather than a zero-sum channel trade-off.
The sellers hitting a ceiling are those treating this as an either/or decision. The top 1% of third-party operators in 2026 are running Amazon as their volume engine and Walmart as their margin engine — and using the profitability gap to out-invest competitors on Amazon’s advertising auction. That playbook is increasingly available to sellers well below the $10M ARR threshold, and the window to run it before Walmart’s marketplace gets as competitive as Amazon’s won’t stay open indefinitely.
