Marketplace Monetization Trends 2026: How Commerce AI Supports Growth Beyond Take Rate

Insights from Topsort’s Marketplace Monetization Index 2026, drawing on platform data from 124 marketplaces.

Marketplace monetization is expanding beyond transaction fees. With high-intent shoppers, rich product data, and direct seller relationships, marketplaces have the foundations to build commerce media businesses within the shopping experience.

The opportunity is growing. Between August 2025 and August 2026, monthly advertising spend on Topsort increased from $14.5 million to $57.9 million, nearly 300%. During that period, the platform’s marketplace cohort expanded from 77 to 124, meaning the increase reflects both a larger platform footprint and activity within existing marketplaces.

Topsort’s Marketplace Monetization Index 2026 examines the capabilities behind sustainable marketplace advertising: commercial scale, seller activation, consumer relevance, operating maturity, and infrastructure readiness.

Its findings highlight five priorities for marketplace leaders, and where Commerce AI can help.

1. Commerce media is becoming a meaningful part of marketplace economics

Marketplaces have traditionally grown through transaction volume, commissions, and service fees. Advertising adds another way to monetize the purchase intent already present across the customer journey.

The index shows a wide range of advertising intensity. Among 82 marketplaces with validated feeds, median advertising spend represented 0.266% of gross merchandise value (GMV). At the 90th percentile, it reached 1.621% – approximately six times the median.

These figures measure advertising spend relative to GMV, rather than marketplace profit. They also reflect different marketplace models, categories, and levels of development.

Still, the spread gives leaders a useful starting point: how much advertising activity does their marketplace support relative to its transaction base, and what constrains further growth?

The practical priority is to give monetization clear ownership, a commercial plan, and a defined role in the broader business. This reflects the wider shift from retail media tools to infrastructure: building the systems needed to operate advertising as a sustainable business.

2. Seller activation requires an operating model for smaller advertisers

Large brands bring visible budgets. Smaller sellers bring scale, and a different service challenge.

In the index’s monthly spend segmentation, advertisers spending under $100 accounted for 78.7% of advertisers but just 6.5% of advertising spend.

Serving this group through extensive manual campaign setup and account management can be difficult to sustain. The opportunity lies in making participation easier: guided onboarding, clear budgets, automated bidding and optimization, and reporting that helps sellers understand their results.

Wolf & Badger illustrates this approach. Its program combined supported onboarding with relevance-based auctions before handing campaign control to brands. In its first six months, more than 800 brands actively ran campaigns, achieving an average 3.9× return on ad spend (ROAS).

The lesson is practical: access to marketplace advertising needs to come with a manageable path to using it.

3. Advertiser retention deserves as much attention as acquisition

A growing advertiser base is encouraging. A base that keeps investing offers a stronger foundation for planning and expansion.

The report found that 70.4% of advertisers active in July were also active in August 2026. Looking across a longer period, 33.6% of August 2025 advertisers were active again in August 2026.

Those measures capture different time horizons; the annual figure does not imply uninterrupted activity throughout the year. Together, they highlight why acquisition and repeat participation should be tracked separately.

For marketplace teams, this means looking beyond campaign launches. Can sellers understand their performance? Do they have a reason to reinvest? Can teams identify when an advertiser needs help?

Relevance, understandable measurement, and timely support all belong in the growth plan. Closed-loop attribution helps connect advertising activity to sales, while incrementality measurement addresses the separate question of which outcomes advertising caused.

4. Commerce AI can help scale advertising operations

Advertising growth creates work: campaign approvals, budget changes, troubleshooting, reporting, and seller support.

The index shows a clear operational difference between maturity stages. The median share of campaigns receiving their first impression within one hour was 15.3% in the Emerging stage, compared with 78.7% in the Intelligent stage.

This is an association within the index, rather than proof that automation alone caused faster launches. It nevertheless highlights an important capability: translating advertiser intent into live delivery efficiently.

Commerce AI can help address that challenge through campaign recommendations, guided setup, performance analysis, and proactive troubleshooting. The emerging model allows advertisers to express an objective while the system helps configure and manage the work within marketplace controls.

Products such as Tomi, Topsort’s AI agent for ad operations, and Data Genie for commerce analytics bring this approach to campaign workflows and business reporting.

For leaders, the question is whether advertising can grow without requiring a proportional increase in manual operations.

5. Commerce media format expansion needs shared infrastructure

Sponsored listings remain the most widely adopted format in the cohort, used by 86.3% of marketplaces. Banner and display adoption stood at 49.2%, while sponsored brands reached 15.3%.

These are adoption snapshots, not evidence that every marketplace should offer every format. The strategic challenge is to expand where advertiser demand and shopper behavior justify it, while keeping measurement, controls, and workflows consistent.

The 1stDibs case study illustrates the importance of that foundation. Its migration involved approximately 1,800–2,000 sponsored listing campaigns. Topsort handled 100% of sponsored listings traffic on launch day, with reported auction latency under 50 milliseconds.

As monetization expands across surfaces, shared commerce media infrastructure needs to preserve the marketplace’s ability to manage relevance, performance, and the seller experience together.

What marketplace leaders should prioritize next

The next step depends on the constraint. Some marketplaces need broader seller participation. Others need clearer measurement, faster operations, or infrastructure that supports expansion.

Start by establishing a baseline, choose the most consequential constraint, and measure whether addressing it produces repeatable improvement.

The Marketplace Monetization Index 2026 provides the full benchmarks, a maturity framework, customer case studies, and a practical 90-day action plan to help make those decisions.

Download the report to benchmark your marketplace and identify what to build next.

About the data: Findings reflect Topsort platform data and the samples specified in the report, rather than the entire marketplace industry. Customer case-study results describe individual programs.

Frequently asked questions

How do marketplaces make money beyond transaction fees?

Marketplaces can generate additional revenue through subscriptions, seller services, and advertising. Commerce media allows brands and sellers to pay for relevant visibility across shopping experiences and connected channels.

How can Commerce AI support marketplace monetization?

Commerce AI can help improve product and ad relevance, simplify campaign creation, recommend budgets, analyze performance, and reduce repetitive operational work. Its value depends on the quality of the underlying data, measurement, and marketplace controls.

Which metrics should marketplaces track for advertising growth?

Useful measures include advertising revenue contribution, active advertisers as a share of eligible sellers, repeat advertiser rate, advertiser performance, and campaigns managed per operator. Together, they help assess commercial growth and the operational capacity to sustain it.

What is the Marketplace Monetization Index 2026?

It is Topsort’s benchmark and operating playbook drawing on platform data from 124 marketplaces. It evaluates commercial scale, seller activation, consumer relevance, operating maturity, and infrastructure readiness.