Only 23% of commerce media buyers say they can confidently tie retail media spend to incremental sales. That single data point, surfaced during Ascendant Network’s inaugural upfront, is why the commerce media measurement gap just became the industry’s most uncomfortable open secret. Brands showed up expecting a glossy pitch. They left with a checklist of questions nobody could fully answer.
Commerce media, the fast-growing category that blends retail data, onsite placements, and off-site amplification, has been sold on the promise of closed-loop attribution. Ascendant Network’s upfront was supposed to be a coronation moment: a new player consolidating retail media inventory across grocery, home goods, and specialty verticals, pitching itself as the answer to Amazon and Walmart Connect fatigue. Instead, it became a case study in how far the industry still has to go before “commerce media” and “measurable media” mean the same thing.
What Actually Happened at the Upfront
Ascendant Network gathered roughly 40 brand and agency buyers, mostly from CPG, beauty, and home categories, to preview its media offerings ahead of next year’s planning cycles. The pitch deck was familiar: first-party purchase data, onsite sponsored placements, off-site retargeting through a demand-side partnership, and a promise of “full-funnel visibility.” What was new was the pushback.
Buyers asked pointed questions about methodology. How was incrementality calculated? Was it modeled or observed? Did the attribution window match what brands were already using for their creator pay contracts and paid social? Ascendant’s team had answers for some of it. For a lot of it, they didn’t.
That’s not a knock on Ascendant specifically. It’s the state of commerce media broadly. Networks are racing to scale inventory before their measurement infrastructure catches up, and buyers are starting to notice the sequencing problem.
The gap isn’t that commerce media doesn’t work. It’s that nobody can agree on what “working” means when three different networks report three different lift numbers for the same campaign.
Why This Matters More Than a Single Vendor’s Growing Pains
Commerce media spend is projected to keep climbing as retailers build out their own ad networks and as brands shift budget away from traditional display, according to data tracked by eMarketer. But growth without standardized measurement is a fragile foundation. Brands have been down this road before with early influencer marketing, where reach was the vanity metric until conversion data forced a reckoning, a shift documented extensively in conversion data replacing reach in creator tier selection.
Commerce media is repeating the pattern. Impressions and click-throughs get reported with confidence. Incrementality, the actual answer to “did this sale happen because of the ad,” gets reported with hedges, footnotes, and modeled estimates that vary wildly by network.
For CMOs and performance marketing leads, this isn’t an academic gripe. It’s a budget risk. If three commerce media networks each claim credit for the same purchase using different attribution windows, finance teams end up double-counting ROI across the media mix. That’s not a measurement gap anymore. That’s a forecasting problem that shows up in board decks.
The Attribution Window Problem Nobody Wants to Fix
Here’s the specific issue that came up repeatedly at the Ascendant upfront: attribution windows aren’t standardized across commerce media networks, and nobody has an incentive to fix it. A 14-day post-click window makes a network’s numbers look better than a 7-day window. Longer windows capture more “conversions,” even if a chunk of those purchases would have happened anyway.
Brands running multi-channel programs, especially those layering commerce media on top of short-form video and search budget, need apples-to-apples comparisons across channels. Right now they’re getting apples, oranges, and something that’s technically a citrus but nobody can name it.
- Ask every commerce media partner for their exact attribution window in writing before signing.
- Request raw conversion data, not just modeled lift percentages, so your internal analytics team can normalize it.
- Insist on a holdout group or geo-split test before committing to a full upfront allocation.
- Cross-reference commerce media lift claims against your own first-party CRM data whenever possible.
Brands Are Pushing Back, Not Walking Away
Despite the rough rollout, most attendees at Ascendant’s upfront didn’t storm out. They asked for revised terms. That distinction matters. Commerce media still offers something traditional display and even most influencer channels can’t: a direct line from ad exposure to a transaction inside a retailer’s own environment. The appeal is real. The execution just isn’t mature yet.
What brands are learning, and what smart procurement teams are now writing into contracts, is that commerce media deals need the same scrutiny that programmatic influencer marketing has had to earn over the past few years. Speed and scale mean nothing if trust in the underlying numbers is shaky.
Some brands are now requiring a 90-day measurement audit clause before renewing any commerce media contract past a trial period. Others are capping initial commitments at 10 to 15% of the retail media line item until a network can produce third-party verified incrementality data. It’s a defensive posture, but it’s a rational one given how much budget is at stake.
A 90-day measurement audit clause costs a network almost nothing to agree to. If they hesitate, that hesitation is your answer.
What This Signals About the Broader Media Measurement Landscape
Ascendant’s upfront isn’t an isolated stumble. It’s a symptom of a broader pattern across performance marketing where attribution has become the industry’s weakest link precisely as spend has diversified. The same tension is playing out in zero click search breaking last click attribution models, where AI-driven discovery is making traditional conversion tracking nearly obsolete. Commerce media, retail media networks, creator partnerships, and AI search are all converging on the same unresolved question: whose measurement do you trust when every platform grades its own homework?
Agencies are starting to build internal measurement teams specifically to normalize data across these fragmented sources, a shift that echoes the operational overhaul described in agencies rebuilding org charts to keep pace with a fragmented creator economy. Measurement literacy is becoming a hiring criterion, not just an analytics nice-to-have.
There’s also a compliance angle brands can’t ignore. As retail media networks handle more first-party and even sensitive purchase data, regulatory scrutiny is intensifying. The Federal Trade Commission has signaled increasing interest in how ad networks use consumer purchase data for targeting and measurement, and UK-based brands operating commerce media programs should keep an eye on guidance from the Information Commissioner’s Office around data processing transparency. Measurement gaps and compliance gaps tend to travel together. If a network can’t explain its attribution methodology clearly, it’s worth asking whether it can explain its data handling just as clearly.
Practical Steps for Brands Evaluating Commerce Media Now
If you’re heading into planning season and commerce media is on the table, treat the Ascendant upfront as a preview of the questions you should be asking every network, not just this one. Standardize your own internal attribution framework first, then hold every vendor to it rather than accepting each network’s proprietary dashboard at face value.
Pilot small. Demand raw data access. Build in an exit clause tied to measurement transparency, not just performance thresholds. And benchmark commerce media lift against channels you already trust, including nano and micro creator programs where conversion data has set a clearer budget benchmark than most commerce media networks can currently offer.
Tools like those tracked by HubSpot and Sprout Social for cross-channel attribution can help brands build a normalized view, but the underlying data quality problem still starts with the network, not the reporting layer sitting on top of it.
Visible FAQ
What is the commerce media measurement gap?
It refers to the inconsistency in how commerce media networks calculate and report attribution, particularly incrementality, meaning brands often can’t verify whether sales lift claims are accurate or comparable across platforms.
Why did Ascendant Network’s upfront highlight this issue?
Buyers at the event asked detailed questions about attribution windows and incrementality methodology that the network couldn’t fully answer, exposing gaps that exist across the commerce media category, not just at one vendor.
How is commerce media different from retail media?
Retail media typically refers to onsite ads within a specific retailer’s ecosystem, while commerce media is a broader category that can include off-site placements, retargeting, and cross-retailer inventory built on first-party purchase data.
What should brands ask for before signing a commerce media contract?
Request the exact attribution window in writing, raw conversion data rather than only modeled lift percentages, and a holdout or geo-split test option to validate incrementality before committing significant budget.
Is commerce media still worth investing in despite these gaps?
Yes, for most brands, but with smaller initial commitments, measurement audit clauses, and direct comparison against channels with proven attribution, such as nano and micro influencer programs.
FAQs
What is the commerce media measurement gap?
It refers to the inconsistency in how commerce media networks calculate and report attribution, particularly incrementality, meaning brands often can’t verify whether sales lift claims are accurate or comparable across platforms.
Why did Ascendant Network’s upfront highlight this issue?
Buyers at the event asked detailed questions about attribution windows and incrementality methodology that the network couldn’t fully answer, exposing gaps that exist across the commerce media category, not just at one vendor.
How is commerce media different from retail media?
Retail media typically refers to onsite ads within a specific retailer’s ecosystem, while commerce media is a broader category that can include off-site placements, retargeting, and cross-retailer inventory built on first-party purchase data.
What should brands ask for before signing a commerce media contract?
Request the exact attribution window in writing, raw conversion data rather than only modeled lift percentages, and a holdout or geo-split test option to validate incrementality before committing significant budget.
Is commerce media still worth investing in despite these gaps?
Yes, for most brands, but with smaller initial commitments, measurement audit clauses, and direct comparison against channels with proven attribution, such as nano and micro influencer programs.
Next step: before you sign anything at the next commerce media upfront, put a 90-day measurement audit clause on the table. If the network won’t agree to it, that’s your answer.
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