For marketplace sellers managing six- and seven-figure ad budgets, the question of where to allocate spend between Amazon Ads and Walmart Connect has never been more consequential — or more competitive. Amazon still controls roughly 77% of U.S. marketplace ad revenue, per eMarketer’s Q2 2026 estimates, generating an annualized $56 billion in ad revenue. But Walmart Connect surpassed $4.2 billion in U.S. ad revenue in fiscal year 2026, a 38% year-over-year jump, as Walmart’s marketplace seller count crossed 150,000 active merchants.
The platforms are philosophically different animals. Amazon Ads is a mature, deeply instrumented system with layered campaign types, AI-driven bidding, and a seller base that has had years to build institutional knowledge. Walmart Connect is leaner, faster-moving, and — critically — operating in a less saturated auction environment where cost-per-click benchmarks remain meaningfully lower. For multichannel operators running both platforms, the strategic calculus isn’t about choosing one over the other. It’s about understanding where each dollar performs and why.
How do the ad product suites compare in 2026?
Amazon’s ad stack remains the most comprehensive in marketplace commerce. Sellers have access to Sponsored Products, Sponsored Brands, Sponsored Display, and DSP (Demand-Side Platform) for programmatic buys, plus the relatively newer Sponsored TV unit that has gained traction with brands running connected-TV campaigns. Amazon Attribution now integrates off-platform signals — Google, Meta, email — giving sellers a cleaner read on full-funnel contribution.
Walmart Connect’s product suite has caught up considerably. Sellers can now run Sponsored Products, Sponsored Brands (launched at scale in late 2024), and Display Ads through a self-serve console built on The Trade Desk infrastructure — a partnership Walmart extended in early 2026. Walmart’s off-site reach via The Trade Desk gives Connect advertisers access to premium publisher inventory tied back to Walmart purchase data, which is a legitimate competitive differentiator. What Connect still lacks: a native DSP with the depth of Amazon’s, and programmatic TV at scale.
- Amazon: Sponsored Products, Sponsored Brands, Sponsored Display, DSP, Sponsored TV, Amazon Attribution
- Walmart Connect: Sponsored Products, Sponsored Brands, Display Ads (TTD-powered), off-site retargeting via Walmart DSP beta
Which platform delivers better CPC and ROAS economics?
This is where the data diverges sharply. Average CPCs on Amazon Sponsored Products in competitive categories — supplements, home goods, electronics accessories — have climbed to $1.85–$3.40 range as of Q2 2026, per Pacvue’s quarterly benchmark report. In some subcategories like protein powder and phone cases, top-of-search CPCs regularly exceed $4.50. The auction is crowded, and Amazon’s AI bidding (dynamic bids — up and down) has made manual control harder to maintain without active management.
Walmart Connect CPCs tell a different story. Pacvue’s same report pegs average Walmart Sponsored Products CPCs at $0.65–$1.20 across comparable categories — roughly 40–60% cheaper than Amazon equivalents. ROAS benchmarks are narrower but still competitive: Amazon Sponsored Products averages 4.1x ROAS across the platform; Walmart Connect averages 3.4x, though sellers in less-competed subcategories are reporting 5x–7x in categories like cleaning supplies, automotive accessories, and pet food where Walmart’s shopper intent is strong and the auction is thin.
“We shifted 22% of our total Amazon PPC budget to Walmart Connect in Q1 2026 and saw blended ROAS on that wallet go from 3.8x to 5.2x within 90 days. The auction is still inefficient — and that’s the opportunity,” said Melissa Hartman, VP of performance marketing at Apex Commerce Group, a Cincinnati-based agency managing $40M in annual marketplace ad spend.
How does each platform handle AI-driven campaign optimization?
Amazon’s investment in AI-native advertising infrastructure accelerated after its 2025 integration of campaign intelligence from Rufus, its generative search engine. Sellers running Sponsored Products campaigns now benefit from Rufus-informed keyword suggestions that reflect conversational query patterns — a meaningful shift from historical keyword harvesting. Amazon’s Performance+ automated campaigns, which launched broadly in 2025, use machine learning to allocate budget across placements in real time, removing granular control but delivering efficiency gains of 15–25% on ACOS for sellers willing to trust the black box.
Walmart Connect’s optimization layer is less mature but accelerating. Its campaign management console now includes Smart Targeting — a rule-based automation system that adjusts bids based on conversion rate trends and inventory signals. It’s not as sophisticated as Amazon’s full AI stack, but sellers running Walmart Connect via third-party tools like Pacvue or Perpetua can layer in algorithmic bid management that partially closes the gap. The Perpetua-Walmart Connect integration, updated in March 2026, now supports dayparting and SKU-level ROAS targets, features that were previously Amazon-exclusive in that platform.
- Amazon Performance+ campaigns: 15–25% ACOS improvement vs. manual for qualifying SKUs
- Walmart Smart Targeting: bid adjustment automation, no granular dayparting natively
- Third-party tools (Pacvue, Perpetua, Teikametrics) support both platforms at parity for most core functions
What does the attribution and measurement stack look like on each platform?
Attribution is where Amazon holds its sharpest structural advantage. Amazon’s closed-loop ecosystem — search, discovery, cart, fulfillment — means every click-to-purchase event is captured with near-perfect fidelity. Amazon Attribution’s expansion to track off-Amazon traffic sources (Google Shopping, Meta, influencer links) has made it a credible cross-channel measurement tool for brands selling exclusively or primarily on Amazon. Brand Analytics, available to Brand Registry sellers, surfaces share-of-voice data, repeat purchase rates, and market basket analysis that Connect simply cannot match today.
Walmart Connect’s attribution relies on a combination of first-party Walmart purchase data and The Trade Desk’s identity graph for off-site placements. For on-site campaigns, attribution windows are comparable to Amazon’s (14-day click, 1-day view). The gap opens in incrementality measurement: Amazon’s Conversion Lift studies and Brand Lift measurement are more widely available and battle-tested. Walmart’s incrementality tooling, offered through a managed services partnership with LiveRamp, remains invite-only for most sellers below $500K in annual Connect spend.
“Attribution on Walmart Connect is still a trust exercise for smaller brands. You’re accepting some black box in the off-site numbers. Amazon isn’t perfect either, but the tooling is years ahead,” said Jason Feifer, a marketplace strategy consultant who formerly led seller growth at a top-20 Amazon aggregator.
How do the fee structures and access tiers compare?
Neither platform charges platform fees for self-serve advertising access — both are free to use if you’re an active seller. The meaningful cost differences emerge in managed service thresholds and minimum spend requirements for premium placements. Amazon DSP requires a minimum commitment of $10,000/month for self-service access through the console; managed service engagements typically start at $35,000/month. Sponsored TV placements carry a $10,000 minimum campaign budget.
Walmart Connect’s managed service entry point is lower: $5,000/month minimum for its Walmart Media Group managed tier, and the Walmart DSP beta (off-site programmatic) is available to sellers at $15,000/month minimum. For sellers in the $1M–$10M annual revenue band, Connect’s access tiers are genuinely more approachable. Self-serve Sponsored Products and Sponsored Brands on both platforms carry no minimums beyond standard marketplace selling requirements.
| Feature | Amazon Ads (2026) | Walmart Connect (2026) |
|---|---|---|
| Avg. Sponsored Products CPC | $1.85–$3.40 | $0.65–$1.20 |
| Platform avg. ROAS (Sponsored Products) | 4.1x | 3.4x |
| Ad product breadth | Full suite incl. DSP + Sponsored TV | SP, SB, Display; DSP in beta |
| AI-native optimization | Performance+, Rufus integration | Smart Targeting (rules-based) |
| Attribution quality | Best-in-class, closed loop | Good on-site; off-site gaps remain |
| Third-party tool support | Pacvue, Perpetua, Teikametrics, Helium 10 | Pacvue, Perpetua, Teikametrics |
| DSP minimum spend | $10,000/mo self-serve | $15,000/mo (beta) |
| Managed service minimum | $35,000/mo | $5,000/mo |
| U.S. shopper reach | ~160M active Prime users | ~90M monthly Walmart.com visitors |
| Auction saturation | High — competitive across most categories | Low to moderate — emerging inventory |
| Annual ad revenue (U.S.) | ~$56B (annualized, 2026) | ~$4.2B (FY2026) |
Which platform should you prioritize in 2026?
The honest answer for most operators: both, in a deliberate allocation. Amazon Ads remains non-negotiable for sellers where Amazon is the primary revenue channel — the shopper intent density, attribution fidelity, and ad product depth are unmatched. If you’re running private label in a competitive category and not advertising on Amazon, you’re effectively invisible on the platform’s AI-driven search layer.
But the case for incrementally shifting 15–25% of discretionary ad budget to Walmart Connect is real and supported by the numbers. The CPC arbitrage is still significant in 2026, Walmart’s grocery and household categories carry shopper intent that rivals Amazon’s, and the auction will only get more crowded as more sellers discover the efficiency gap. Agencies running multichannel accounts are increasingly treating Walmart Connect as the “emerging channel” budget — structured test-and-learn allocation, not an afterthought.
- Sellers with $500K–$5M Amazon ad spend: allocate 15–20% to Walmart Connect as incremental test budget
- Sellers in grocery, cleaning, pet, and automotive categories: Walmart Connect ROAS often exceeds Amazon in these verticals
- Sellers dependent on Amazon DSP for retargeting: no equivalent at scale on Walmart yet — keep DSP budget on Amazon
- Brands with Brand Registry and heavy Sponsored Brands usage: Amazon remains the only platform with full creative and search funnel control
The structural reality is that Amazon’s ad business is enormous, mature, and increasingly expensive. Walmart Connect is smaller, cheaper, and faster-moving. For multichannel operators who have the operational bandwidth to run both platforms — ideally through a unified tool like Pacvue or Perpetua — the combined stack outperforms either platform in isolation. The arbitrage window on Walmart Connect won’t last indefinitely. The sellers capturing it now are building category authority before the auction catches up.
