On September 22, IAB Tech Lab released AAMP 3.0. The headline feature is a specification called OpenProposal. It does something that sounds mundane and is not: it standardizes how sellers describe their advertising products so that buyer agents can discover, compare, and evaluate them without human mediation.
That sentence contains the entire problem for D/Cipher. But it requires unpacking.
What OpenProposal Does
Before OpenProposal, a buyer agent could find sellers through the AAMP registry and execute transactions through existing programmatic rails. But the middle — the proposal stage, where a seller says here is what I offer, here is who it reaches, here is what it costs, here is how to evaluate it against alternatives — was manual. Emails. PDFs. Phone calls. The RFP-to-buy gap.
OpenProposal closes that gap with a seven-stage lifecycle:
A buyer agent following this lifecycle can now discover sellers, request proposals, compare them against a campaign brief, qualify the audience, negotiate terms, execute, and measure results. End to end. No human in the loop. No phone call. No PDF.
D/Cipher — People Inc's contextual ad platform, the one Vogel calls the "fastest-growing unit" — does not appear at any stage.
The Velocity
What makes AAMP 3.0 significant isn't the spec itself. It's the pace.
AAMP 1.0 shipped in March. Discovery and agent identity. AAMP 2.0 came in May with transaction SDKs. Ten registry entries, zero from People Inc. AAMP 2.3 arrived July 30 with Google Ad Manager Reporting integration — meaning the protocol reached down into D/Cipher's own infrastructure layer and pulled data through AAMP without D/Cipher's involvement. Nearly 5,000 unit tests. Horizontal scaling. Model-agnostic deployment across OpenAI, Gemini, and open-source models.
Now AAMP 3.0. Four major releases in six months. Each one filled a gap in the transaction lifecycle. The protocol is no longer an experiment. It's a standards body shipping production software on a cadence that resembles a well-funded startup, not a committee.
Meanwhile, the D/Cipher PM role — the one that lists "Model Context Protocol" as a preferred qualification — has been posted for three months.
The Shape of the Market
OpenProposal is a seller-side specification. It defines how a publisher or ad platform describes what it has to offer. This is different from the buy-side tools that AAMP previously standardized. It means the protocol is now reaching into D/Cipher's core function — not its infrastructure (that was AAMP 2.3 and GAM), but its market identity.
D/Cipher's value proposition is contextual intent targeting across 40+ brands and 200 million monthly uniques. That is exactly the kind of product that OpenProposal was designed to describe: ad packages with audience signals, pricing terms, qualification criteria, and performance guarantees. The specification was built for sellers like D/Cipher.
Except D/Cipher isn't describing itself in this language. And the agencies are already learning it. WPP Media called it a "transaction-ready framework." PMG noted that proposals now travel with reasoning — the buyer agent doesn't just see a CPM, it sees why the audience fits. IAB Australia is running seller-side sandbox pilots.
The public comment period runs through October 22. The same month People Inc launches its premium subscription bundle. Two systems maturing simultaneously, in different rooms, with no hallway between them.
What the Comment Period Means
A public comment period is an invitation. Any seller can submit feedback, request modifications, propose extensions, or simply register intent. It is the open window before the standard sets. After October 22, OpenProposal moves toward finalization. The sellers who participated in the comment period will have shaped the language the market speaks. The sellers who didn't will speak it as a second language — or not at all.
Jonathan Roberts, People Inc's Chief Innovation Officer, is a founding participant in IAB Tech Lab's CoMP working group. He named AAMP in Digiday. He said interoperability is "essential." He cited the trust gap. But the pattern holds: participation on the floor (content licensing standards), absence from the ceiling (ad tech protocols).
The comment period is the ceiling knocking.
PPLI closed today at $38.05. The AAMP registry's SSE endpoint deprecates September 30. The protocol keeps moving. The question is no longer whether D/Cipher will join. It's whether the market that forms without it will still have a seat.