Growing consumer adoption of AI tools is positioning AI platforms as an alternative shopping channel—but most AI-driven transactions are still completed on retailer websites.

Stripe launched its Agentic Commerce Suite, enabling affiliated merchants to service agentic checkout, per a press release. Merchants will be able to upload their inventories to databases that are scannable by AI agents without updating their own tech stack. Gen Z and millennials shoppers are becoming more comfortable using AI agents to shop for discretionary and essential shopping hauls. Merchants that make it easy for consumers to transfer repeat purchases to programmable agentic purchases stand to score great volume opportunities as shoppers look for a low-touch restock experience.

As retail media moves from side business to centerpiece, big brands are prioritizing measurement and efficiency to cement the channel as a mature budget item. Retail media will grow almost 20% this year (19.4%) to reach $58.79 billion, according to EMARKETER's September 2025 forecast. In recent earnings calls, tech leaders described a channel that is now about solid data, AI-driven relevance, and reshaping how advertisers reach shoppers.

Future-proofing against—and capitalizing on—advances in consumer-facing AI will be the overarching theme for retailers in 2026.

This benchmark covers how ad buyers can calibrate their retail media ad spending and budget allocations against the market, and how publishers and solution providers can assess whether their ad revenues align with industry trends.

The world’s largest digital platforms are increasingly treating AI as the foundation of a new commercial paradigm, according to recent earning calls from Google, Amazon, and more.

ThredUp posted its strongest revenue growth in nearly four years in Q3 as rising price sensitivity fuels interest in online resale. Active buyers surged 26% YoY as ThredUp touted its “best quarter for new buyer acquisition” in company history. Resale is having a moment. The end of de minimis import exemptions and new tariffs on apparel are making buying secondhand more appealing to price-sensitive consumers, while younger generations are embracing resale for its affordability and creative possibilities. We expect fashion online resale platform sales to expand 10.4% this year, nearly double the rate of online apparel, footwear, and accessories sales.

Etsy is betting on a new CEO to help revitalize its business after years of sluggish growth. Kruti Patel Goyal, the company’s chief growth officer, will take over the job from Josh Silverman next year. Etsy is in a tough position. The combination of economic uncertainty and a cost-of-living crisis are dampening demand for the discretionary items that it sells, while tariffs and the end of de minimis make it harder for sellers to operate. While Depop’s success is a bright spot, the platform is not large enough to offset Etsy’s broader GMS declines.

Now that consumers can make direct purchases within ChatGPT, marketers and retailers must reimagine the customer journey once again.

OpenAI is preparing to turn ChatGPT into an advertising platform, posting a new role for an engineer to build systems for ad integration, campaign management, and attribution. The move could position ChatGPT as a new challenger to Google, Meta, and Amazon’s ad businesses. Already a major driver of referral traffic to retailers like Walmart, Etsy, and Target, ChatGPT has clear potential to evolve into a commerce and ad engine. But execution will be critical: Poorly integrated ads risk undermining user trust, even as AI-driven ad formats are projected to grow at triple-digit annual rates in the coming years.

Marketplaces have been driving US ecommerce growth. But established players face a shake-up from new entrants and advances in AI and agentic commerce.

Etsy and eBay see opportunity to gain share as tariffs burden their competitors and consumers adjust their spending habits. Both companies are well-positioned to benefit from renewed interest in resale as tariffs make buying new more expensive for shoppers. The two platforms also now face less competition from Shein, Temu, and Amazon in online ad auctions—allowing them to be more efficient with marketing spend and reach more potential customers. While neither eBay nor Etsy is fully immune from the effects of tariffs—and their potential drag on the economy and consumer confidence—they are less exposed than most other retailers.

This is the Q1 2025 installment of our quarterly “Ad Spending Benchmarks” series, which helps ad buyers and sellers calibrate their spending and revenue mix against the market.

Retailers that aimed to be media giants are hitting headwinds as ad growth slows. To stay competitive, retail media networks must rethink org structure, sharpen media skills, and plan smartly to thrive in a more challenging landscape.

Amazon and Walmart dominate the landscape, but the other half of US ecommerce sales is still up for grabs.

Retail media’s rapid growth has spurred nonretail verticals to harness their first-party data to fuel their own commerce media networks. Retail media spending still dominates the commerce media landscape, but distinct challenger cohorts are finding their footing.

TikTok Shop’s demise could benefit Amazon, Etsy, and Temu: All three retailers are poised to scoop up spending in the event of a TikTok ban.

Gen Z shoppers embrace Temu, Shein, and TikTok Shop: 1 in 4 makes a purchase at a Chinese online marketplace at least once a week, as their array of cheap, trendy goods proves impossible for the price-sensitive cohort to resist.

This is the first installment of our quarterly “Ad Spending Benchmarks” series, which helps ad buyers and sellers calibrate their spending and revenue mix against the market.