Paid search campaigns on retail marketplaces gain prominence. That, to the extent, is a disruptive element in the retail ad ecosystem.

Statista shows that digital retail media advertising spending worldwide is projected to increase to more than $175.6 billion by 2028. Given the rapid growth, it’s fast-changing the way brands capture high-intent audiences directly at the digital shelves.

Unlike traditional search, paid search campaigns on retail marketplaces place sellers’ products on retailers’ website space and meet consumers at any point in the online shopping experience. For sellers, this becomes their premier platform for accessing an expansive customer base and gaining brand visibility.

The largest players in retail, such as Amazon, Walmart, Target, and Kroger, have long relied on retail media strategies to monetize their website space and massive web traffic. Of course, an equally fast adoption curve is for brands buying that space and chasing incremental sales.

But with more sellers entering the arena, it’s a dog-eat-dog kind of competition. So, even when retail media is a rewarding marketing channel, you should have a solid understanding of marketplace search advertising optimization before you expect meaningful returns.

Otherwise, high bid inflation and increased competition turns a “set and rest” retail PPC strategy into a gateway to shrinking margins and wasted ad spend.

If you’re already investing in retail marketplace PPC, the question is no longer if you should be there, but how effectively you are optimizing retail media campaigns.

Today, we’re exploring how your business can get the most out of paid search campaigns on retail marketplaces. We’ll dig deep into the technical nuances of Walmart Connect advertising, Kroger advertising, and Target Roundel advertising to help you turn paid search on marketplaces into your most powerful growth engine.

Retail marketplace paid search is a flywheel

What makes retail media campaigns different from other ad platforms?

Retail paid search goes far beyond static banners. It includes sponsored search results, product-level placements, audience targeting based on real purchase behavior, and formats designed to blend into the shopping journey.

Retail marketplace PPC works by giving brands access to a retailer’s digital advertising space and shopper data.

Sellers run paid search campaigns within the marketplace. The use of first-party retail data helps them display their products where purchase decisions are made—within search results, category pages, and product listings.

More than targeting, past purchase data offers foresight. It shows advertisers what products they should feature in future campaign messaging. As ad spend concentrates on high-intent shoppers with a strong likelihood to convert, rather than getting diluted across low-value impressions.  

But the real advantages show up when retail marketplace PPC stops being a traditional funnel and starts manifesting as a Marketplace flywheel.

A marketplace flywheel is a self-reinforcing growth model. Wherein each successful action on a platform naturally triggers and strengthens the next. Once in motion, the cycle creates a “virtuous cycle” of compounding momentum and requires less effort to maintain.

Remember Amazon’s flywheel—the one that’s been adapted and referenced countless times?

Lower prices → more traffic → more sellers → better selection → better experience → more traffic

This dynamic isn’t unique to Amazon. It’s at the heart of how modern marketplaces flourish. 

This is how a marketplace flywheel, aka PPC-to-Organic Flywheel, works for retail media campaigns:

• The algorithms powering Amazon, Walmart, and Kroger are risk-averse. They show products that are guaranteed to convert. If a sale comes from a sponsored click or an organic one, it doesn’t matter. They care about sales velocity.
• When you execute high-precision retail marketplace PPC campaigns, you accelerate sales velocity. It’s like providing the algorithm with “proof of relevance.” Your Best Seller Rank (BSR) improves because you are moving units faster than the competition.
• Because the retail marketplace wants to maximize its own revenue, it begins to reward your “proven” product with higher organic placement for those same keywords.
• As your organic rank solidifies, your dependency on paid clicks for that keyword drops, and paid spend becomes more efficient. Your Total Advertising Cost of Sale (TACoS) decreases even as your total revenue scales.

In short, buyers draw in sellers. Sellers expand selection and availability. A better selection improves the shopping experience, attracting even more buyers.

Retail media operates within this loop as the revenue layer, monetizing traffic without compromising the experience shoppers came for.

For brands like Walmart and Amazon, the flywheel only works if the customer experience (CX) remains intact. They have opened the floodgates—over 85% of sponsored impressions now come from brands outside the “tier-one” corporate giants. This democratization is a massive opportunity for D2C brands, but it comes with a catch.

If aggressive bidding is the core of your marketplace search advertising optimization, the flywheel will grind to a halt. But when your paid search is in sync with product-market fit, pricing, availability, and shopper intent, the flywheel keeps going. This lowers long-term acquisition costs and cements category position.

Having understood that, here’s everything you need to optimize retail media campaigns and get the most from powerful retail platforms.

Get inside Mavlers’ approach and check out our guide on How Mavlers Is Using AI & Automation to Elevate Paid Media Execution (and Finally Ditching Dashboard Fatigue).

Marketplace search advertising optimization for Walmart Connect

Walmart Connect rewards discipline more than aggression. It’s a platform built on first-party data, real-time shopping intent, and operational signals, and it expects your Walmart Connect advertising campaigns to reflect that maturity.

To optimize the retail PPC strategy for Walmart:

1. Get retail-ready before you bid

Before scaling spend on Walmart Connect advertising, get your catalog “Retail Ready.” Make sure:

• Product listings are conversion-ready. Aim for a Listing Quality Score of at least 80%. This includes high-resolution imagery, mobile-optimized descriptions, and stable pricing.
• Inventory levels are stable. Out-of-stock SKUs waste budget. So pause the moment a SKU hits low-inventory thresholds.
• Ads on Walmart only run if you win the Buy Box. Optimization starts with ensuring your fulfillment (WFS) and pricing are competitive enough to maintain that “Add to Cart” position.

2. Use bidding as a control system

Walmart Connect operates on a second-price auction model. You only pay a cent more than the next highest bidder. Relevance still matters as much as bid value.

• Start with Walmart’s suggested bids. Then test incrementally to understand auction pressure.
• Enable dynamic bidding.  It is especially effective when PDPs and inventory are healthy. It adjusts bids in real time based on conversion likelihood. The platform can hike your bid by up to 100% when a conversion is likely, or drop it by 50% for low-intent traffic.
• For brands with strict margin requirements, Target ROAS (tROAS) is the ultimate “set-and-scale” tool. Instead of micromanaging keywords, you define your profit goals and let the algorithm manage bid volatility. Works best when conversion data is clean, and PDPs are optimized.

3. Tiered keyword matching

Stop bidding the same amount for Broad and Exact matches.

• Exact Match: This is your high-intent “Holy Grail.” Bid aggressively here.
• Phrase Match: Your mid-funnel balance.
• Broad Match: Use this strictly for discovery, then harvest the winners and move them to Exact.

4. Allocate budget by SKU performance

Some advertisers treat an entire catalog as a single entity. Don’t be that person. To protect your margins, you must tier your SKUs.

• Tier 1 : High-margin, high-conversion items. These get the lion’s share of your Walmart Connect advertising budget and the most aggressive “Top of Search” bids.
• Tier 2 : Seasonal or new products. Use Walmart Connect advertising here to build the initial sales velocity needed for the Marketplace Flywheel.
• Tier 3 : Low-margin or poor-converting items. Minimize spend here unless you are clearing overstock.

5. Beyond sponsored products

If you only use Sponsored Products, you are underestimating Walmart paid search. A mature Walmart Connect advertising strategy has a multi-format approach:

• Sponsored Brands & Video: Use these for “Top of Search” products. Video, in particular, works exceptionally well for visual categories like beauty or electronics.
• Display Ads: Leverage Walmart’s 1st-party data for retargeting. If a shopper viewed your product but didn’t buy, a Walmart display ad can follow them across the web to bring them back.
• Lookalike Audiences: Use Walmart’s “Audience Tools” to find new shoppers who mimic the behavior of your highest-value customers.

Optimizing retail ads on Kroger Precision Marketing (KPM)

To master Kroger advertising, you have to look beyond the search bar. Kroger advertising is powered by 84.51°—the retailer’s elite data science arm. It tracks the actual purchase behavior of over 60 million households.

Here’s how profitable brands use it in their favour and optimize their retail media campaigns on Kroger.

1. Build audiences from purchase behavior

The core advantage of KPM is access to verified loyalty transactions. Because this data is “closed-loop,” you can target shoppers based on:

• Frequent category buyers (high probability, low education needed).
• Brand switchers (buyers of adjacent or competing SKUs).
• Lapsed purchasers (high ROI for reactivation).
• Private-label buyers trading up to premium alternatives.

2. Encash the “First-Mover” advantage

One of the best Kroger advertising tactics is simply being there. Compared to the hyper-saturated Amazon landscape, many Kroger advertising categories are currently underserved. To exploit early adoption in Kroger advertising:

• Secure “Top of Search” placements for a fraction of what they cost on other marketplaces.
• Secure a spot in their “Recent Purchases” or “Start My Order” list.

3. Time campaigns to purchase cycles

Kroger’s loyalty data makes purchase cadence visible. Use it. If your product is typically repurchased every 2–4 weeks:

• Increase bids during replenishment windows.
• Match ad messaging with “running low” moments.
• Suppress ads immediately after purchase to avoid waste

4. Use off-site media to feed onsite conversion

KPM’s first-party audiences extend beyond Kroger-owned properties into:

• Paid social
• Display networks
• Connected TV (CTV)

The most efficient advertisers use off-site placements to:

• Prime demand.
• Re-engage known households.
• Drive qualified traffic back into Kroger’s ecosystem.

How to optimize retail ads on Target Roundel

Advertising on Target Roundel is a “high-bar” ecosystem, particularly for smaller or emerging brands, due to its curated approach and strict standards. To optimize your target roundel advertising, you must move beyond generic PPC for retail tactics.

Here’s how to optimize retail media campaigns on Target.

1. The full door distribution edge

Brands with distribution in over 200 physical Target stores see significantly better Target Roundel advertising performance. So, before launching campaigns, audit SKU availability across regions. Suppress ads for products with limited or inconsistent distribution.

2. Choose SKUs built for Target shoppers

One of the biggest mistakes in target roundel advertising is seeing it as a mirror of your Walmart or Amazon catalog. The Target shopper has a distinct persona. They skew more toward curated choice, quality perception, and brand trust.

What to prioritize:

• Hero SKUs with strong in-store velocity.
• Products with clear differentiation (pack size, claims, bundles).
• Items aligned with Target’s private-label-adjacent categories.

3. Define success before you spend

Track performance against your own benchmarks, not platform averages. Before launch, lock in benchmarks:

• Target ROAS by category
• Expected conversion rate by placement
• Incremental lift vs. baseline sales

4. Use segmentation to prioritize high-value shoppers

Use segmentation to focus on:

• High-LTV shoppers.
• Repeat category buyers.
• Brand-adjacent audiences primed for conversion.

Stop managing ads and start scaling profits with Mavlers

A well-structured, high-quality paid search campaign should always be the foundation. That’s non-negotiable. Without clean account architecture, reliable signals, and clear KPIs, optimizations become reactive—and expensive.

But once that foundation is in place, the next step begins.

Because rising CPCs, diluted targeting, and inconsistent ROAS can’t be fixed by occasional optimizations. They’re symptoms of a system that isn’t adapting fast enough to how retail media platforms are evolving. Or you’re likely just outgrowing manual management.

That’s where Mavlers comes in.

At Mavlers, we bridge the gap between complex marketplace data and profitable execution. Our AI-led bidding and optimization model works in real-time to identify “vampire” clicks and reallocate your budget toward the SKUs and keywords that actually move the needle for your retail PPC strategy.

Instead of:

• Overbidding on low-intent traffic
• Letting high-performing SKUs plateau
• Reacting to performance drops after the damage is done

You get:

• Smarter bid adjustments based on live performance signals
• Tighter targeting that reflects real shopper intent
• More consistent ROAS without overspending to maintain scale

Reach out to Mavlers for a consultation. Let’s audit your current spend, identify the waste, and start making the Marketplace Flywheel work for you.