Google Ads API v25.1: Lift Studies Go Programmatic

Google just opened a door we've been waiting years for. Version 25.1 of its Ads API finally enables programmatic access to lift studies and brand lift data: real incremental measurement, automatable, with no more hand-scraping reports. The catch is that this door has a bouncer.

TL;DR: The Straight Take

• Lift studies: controlled experiments that measure the true incremental impact of your campaigns, beyond clicks and impressions. Now accessible via API.
• 24 new metrics: Conversion Lift and Brand Lift with segmentation by demographics, device, and video, all queryable programmatically.
• Restricted access: allowlist accounts only. You need a Google account rep to request it.
• Availability in Spain: not confirmed by the official source. Google's usual pattern suggests it will take time.

Verdict: if you integrate Google Ads via API and track incrementality, start prepping your infrastructure now. When access opens up, you don't want to be last in line.

What Do Lift Studies and Brand Lift Actually Measure?

Google Ads lift studies are controlled experiments that quantify the incremental impact of an ad campaign by comparing a group exposed to ads against a control group that wasn't. They don't measure clicks or impressions, they measure how many conversions or sales happened BECAUSE the user saw your ad.

It's the difference between correlation and causation applied to paid media. And in an industry where half of all attribution is smoke and mirrors, that's worth its weight in gold.

Brand lift covers the perception side: awareness, ad recall, purchase consideration, intent. If you're running video or reach campaigns with no visibility into these metrics, you're investing blind at the top of the funnel. If you're already working with branded content measurement on YouTube, the new dimensional brand lift resources, broken down by video and device, will be especially relevant.

Until now, accessing this data required manual processes inside the Google Ads interface. Cross-referencing it with your own data infrastructure or automating incrementality reporting was the kind of headache nobody wanted to deal with.

What Google Ads API v25.1 Unlocks That Wasn't Possible Before

The new version introduces read-only access to lift studies data through two new resources: LiftMeasurementConfig and LiftMeasurementFlight. In plain English: you can query your study configurations, dates, associated campaigns, and conversion objectives through code.

The numbers: 24 new Conversion Lift metrics and statistical significance metrics. Plus new dimensional Brand Lift resources (LiftMeasurementAgeRange, LiftMeasurementCampaign, LiftMeasurementDevice, LiftMeasurementGender, LiftMeasurementVideo) that let you slice results by demographics and creatives.

And here's what's most interesting: access is READ-ONLY. You can query data, but you can't create or manage studies through the API. Google lets you look, but not touch.

That's a real step forward. But for a dev team that wants to automate the full measurement cycle, this is only half the road. My bet is that the ability to create studies via API will come later, once Google has validated the system holds up. For now, setting up a study is still a manual job.

If you manage dozens of accounts at an agency, this matters: you can build an automated process to pull incrementality data and cross-reference it with your own attribution model. That's something you genuinely couldn't do before.

How to Request Access (Spoiler: Google Has to Know You Exist)

The lift studies and brand lift functionality in API v25.1 is available exclusively to allowlist accounts. Two steps, and the first one is the real filter.

Contact your Google account rep to request allowlist access. No rep? That's your first wall. Then update your client libraries to version 25.1.

What about Spain or the European Union? The official source doesn't confirm specific availability for our region. The announcement makes no explicit geographic distinction. And when we're talking about measurement features that touch user data in a GDPR context, that's not a minor detail.

In my experience, Google has a clear pattern with advanced measurement features: they land in the US first, then major markets, and reach Spain months later. It's not personal, European regulation adds layers of red tape that slow rollouts down. Nobody should be surprised if this takes a while.

Is It Worth Preparing Now?

If your technical team integrates Google Ads via API and measuring campaign incrementality is part of your day-to-day, yes. Even with restricted access today, Google APIs rarely debut in beta only to shut down. The usual path is allowlist, open beta, general availability. Getting your infrastructure ready now puts you at the front of the queue when access opens up.

If you don't have a Google account rep, this feature is out of reach for the moment. And that says a lot about how Google frames advanced measurement: the bigger the spend, the better the tools.

Everyone else waits.

As I explain in the complete Google Ads guide, the platform keeps piling on complexity that rewards those who understand how it works under the hood. Lift studies in the API are exactly that: a powerful tool that only pays off if you have the technical team to leverage it and the investment volume to get Google to open the door.

Incremental measurement is moving from big-brand luxury to API-accessible reality. But "accessible" and "available to everyone" still aren't the same thing.