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Blocalhost, a podcast Ari Paparo and Paul Knegten run on ad-tech news, spent most of episode 187 on a Google-sponsored DigiDay piece that deserves more scrutiny than it got. The piece describes Google wiring REST APIs and an MCP server (a connector that lets AI agents talk directly to Google Ad Manager, its dominant ad server) into its stack, which would let buyers and sellers transact without an independent DSP or SSP (the middlemen who currently match ads to inventory) in the loop. Paparo's antitrust read is the one to take seriously: if buying migrates to agent-to-agent deals inside GAM, the government's remedy targeting AdX, Google's ad exchange, hits a chokepoint that's already becoming less relevant.

The Skeptic's counter is real, though. A Google-sponsored roadmap is not a product. Running a media plan at scale with brand safety, frequency caps, and reconciliation through an AI agent is nowhere close to shipping.

The direction is right; the timeline is not. Publishers and agencies are not handing spend over to AI agents unsupervised in the near term. The slow erosion is SSP rev share: if GAM does the deal, why pay for the layer?

Analysis

Showing the shorter version.

Google wants publishers and agencies to negotiate and run campaigns directly through AI tooling wired into Google Ad Manager (GAM), its dominant ad server. Ari Paparo and Paul Knegten flagged a Google-sponsored DigiDay piece as the evidence: REST APIs plus an MCP server (a plug that lets AI agents talk to GAM directly) that could let buyers and sellers transact without an independent DSP or SSP in the middle.

Here's where the antitrust picture gets complicated. The government wants Google to divest AdX, its ad exchange. Paparo's point: if buying moves to AI-powered direct deals inside GAM, AdX matters less, so Google could hand over the exchange and keep the ad server that actually locks in the market. The remedy gets aimed at yesterday's chokepoint. For independent DSPs like The Trade Desk (the largest independent ad-buying platform) and SSPs, that's the structural threat.

The skeptic case is worth holding alongside it. A Google-sponsored article promising REST APIs and an MCP server is a roadmap, not a product. The gap between an agent that fills a form and one that clears a media plan at scale, with brand safety, frequency capping, and reconciliation, is enormous. No operator should restructure their stack around a sponsored blog post.

The second-order effect is the one to watch. If Google's tooling makes direct deals cheap to execute, SSP integrations stop earning their rev share, and publishers start asking why they pay for a layer the ad server now handles. That erosion is gradual, not a switch. Audit which of your SSP and DSP integrations still earn their rev share on their own merits, because that's the layer that erodes whether or not Google's agents ever ship at scale.

Two other items from the episode worth flagging. Sony alleges WPP took roughly $350 million in Chinese media rebates and passed back about $110 million, keeping around $240 million through shell companies. Those are plaintiff allegations, unproven, in active litigation. But rebate opacity is exactly why big advertisers are moving spend toward retail media and direct platforms where the money trail is shorter. Walmart Connect growing 38% year-over-year isn't unrelated. On the M&A side, LiveRamp shareholders rejected a roughly $98 million executive pay package tied to an acquisition. Paparo thinks the deal closes anyway, but the acquirer now inherits retention risk with the parachutes voted down. A rejected package doesn't stop a deal; it leaves the buyer holding the problem of keeping the people who built the thing.

Our call: Google ships the GAM REST APIs and MCP server to general availability during 2026, but through the 2027 upfront, no top-10 advertiser or holding company runs material open-web media plans agent-to-agent through GAM without a DSP in the loop. The tooling is real and coming. Adoption at scale is the slow part. Buyers keep an independent layer precisely so the seller's ad server isn't grading its own homework, and the WPP rebate mess is a live reminder of what happens when buyers trust the middle too much. The antitrust remedy, meanwhile, keeps aiming at AdX while the ad-server lock-in stays untouched.

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