Developing
This is a proposal, not a shipped standard, and Google has not said it will take part.
In 60 seconds
- AdExchanger reported a Prebid working group proposal to reverse the auction so ad servers bid into Prebid.
- It was previewed at the Prebid Summit in New York and is co-authored by Olly Burns of Teal; the aim is to formalise it by the end of Q1.
- It depends on Google integrating with Prebid Server, not only Prebid.js.
- Judge Leonie Brinkema ordered Google to integrate with Prebid but declined to break up Google Ad Manager and did not specify how.
Impact Layer
- What changed
- Publishers and Prebid maintainers now have a concrete design for how a dominant ad server could take part in a Prebid auction.
- Why it matters
- The remedy order says Google must integrate with Prebid but not how, so the design that wins will decide how much control publishers keep over their auctions.
- Who is affected
- Publishers, supply-side platforms and ad-server vendors that use Prebid.
- Martech stack area
- Advertising, Data
- Stack impact
- If you run Prebid, follow the working group's draft and ask your ad-server and SSP contacts how they would plug into a reversed auction.
- Business impact
- Moderate Secondary reporting: PPC Land summarises AdExchanger's report in its October 14 edition. We did not read the proposal itself, and it is not yet a standard.
- Related technologies
- Related vendors
- What to watch
- Whether Google commits to Prebid Server integration and whether the working group meets its first-quarter target.
PPC Land’s October 14, 2026 edition summarises an AdExchanger report by Anthony Vargas on a Prebid working group proposal to reverse the usual header-bidding order.
What is proposed
- Ad servers, including Google’s, would bid into Prebid instead of Prebid bidding into the ad server.
- The idea was previewed at the Prebid Summit in New York and co-authored by Olly Burns of Teal.
- The group aims to formalise it by the end of the first quarter.
- It depends on Google integrating with Prebid Server, not only Prebid.js.
The court backdrop
Judge Leonie Brinkema ordered Google to integrate with Prebid. She declined to break up Google Ad Manager and did not specify how the integration should work.
Not stated
Whether Google has agreed to the design, what the technical changes would cost publishers, and how a reversed auction would affect revenue.
Our read
A court order leaves the how open, and proposals like this fill the gap. Publishers should read the draft once it is public rather than wait for a vendor to explain it.
Sources
- PPC Land: Google Ads lets advertisers cap Display spend, on a best-effort basis (edition of October 14, 2026) (opens in a new tab)
Source for the Prebid proposal, its authors, its timeline and the court order.