The Internet Advertising Bureau Says Agentic AI Will Expose Old Cracks In Measurement

When an AI agent browses, compares products and completes a purchase on a consumer's behalf, what did that consumer actually see, and if no human eye landed on the ad, does the impression count? That is the question Cintia Gabilan, senior vice president for product development at the Internet Advertising Bureau, puts at the centre of the measurement problem in a video interview with Beet.TV at IAB CreatorFronts. "Impression is not an impression anymore if it's seen not by a human eye," she says, adding: "Human clicking will not be as it was because you just share a prompt and then you get something in return without needing to click in anything." Gabilan argues the industry built its entire measurement infrastructure on the assumption that humans see, click and buy, and that agentic commerce breaks every link in that chain, leaving no shared vocabulary or key performance indicators for what success looks like. "We need to rethink alongside all the legacy methodologies and how we can combine them," she says. "Think MMM, incrementality, attribution... and on top of it, how the agentic web come along with all this non-language we don't have." The financial pressure is coming from the top: "CFOs and the CMOs are asking their teams, where is the ROI of all this AI tooling that we are paying. There is not even a benchmark to analyze and evaluate all of that." The scale behind that frustration is on the record: Emarketer forecasts U.S. AI ad spending will more than double to $68.25 billion by 2030, with more than 80% of AI advertising this year appearing next to AI content rather than inside conversational interfaces, and the IAB's own September research found 72% of consumers now use general-purpose AI assistants for shopping decisions, with 56% preferring recommendations that carry creator perspectives. Against the argument that it is too early to standardise, Gabilan points to IAB Tech Lab's AAMP 3.0 protocols for how agents discover, negotiate and execute media, and a framework introducing the "4 P's" of presence, prominence, portrayal and persuasion.

The crux

If agentic commerce takes hold, the impression as a priced unit of delivery loses its legal and commercial footing, and whoever defines the replacement metric captures the margin on the whole agentic channel.

Sell-side read

A publisher whose inventory is priced and guaranteed on human-viewable impressions is exposed to a definitional risk it does not control; the near-term defence is ensuring your measurement contracts let you re-baseline rather than locking you to a 2024-vintage unit.

Watch

whether the IAB's AAMP 3.0 protocols and the "4 P's" framework get adopted by any major demand-side platform before the 2027 upfront season, which is the signal that standardisation is real rather than aspirational.