OpenProposal turns the media-buying RFP into a catalog a buyer agent can rank

A seller publishes a catalog of standard packages and holds other products back for custom proposals ^[5]. A buyer agent submits the campaign brief, then ranks what comes back against declared audience, timing, format and pricing requirements ^[6]. That ranking is only as good as the declarations. Fields nobody populated cannot be compared.

The parts of AAMP 3.0 worth reading closely are the unglamorous ones. Pricing, packages, orders and buy details are constrained by deterministic rules ^[9]. Authentication and authorization decide which agents can transact ^[10]. Idempotency lets an agent retry an order request that went unanswered without accidentally placing the order twice ^[11]. A person who emails an RFP twice gets an apologetic reply; an agent retrying an order over a protocol with no idempotency gets two orders.

What it costs to adopt depends on what you already run. An approved proposal is designed to flow into IAB Tech Lab's existing AdCOM, OpenDirect and Deals API standards for booking, execution and reporting ^[7]. The reference buyer software is built to browse seller catalogs, negotiate prices, aggregate inventory across publishers and book programmatic-direct deals through OpenDirect ^[14]. A seller whose booking path is already OpenDirect is mapping product data into a new schema and standing up an endpoint. A seller whose RFP process runs on briefs, media kits, spreadsheets, emails and meetings ^[8] has to build the catalog first.

Katsur has worked inside those systems. He took over IAB Tech Lab in 2021, after engineering, product and management roles at DoubleClick, a CEO stint at Maxifier, senior positions at MediaMath and Rubicon Project, leading Sonobi and an executive role at Nexstar Media Group. His IAB Tech Lab biography spans more than 27 years in advertising technology ^[19]. According to runtimewire, AAMP 3.0 follows that history: it asks publishers, agencies and ad-tech platforms to make existing systems legible to agents ^[23].

"OpenProposal fills a major gap between a buyer's brief and a buy commitment," Katsur said in the announcement ^[15]. PMG executive Mike Treon said in the announcement that AAMP 3.0 lets a publisher's reasoning about why an audience, format or sponsorship suits a campaign travel with the proposal in a form planning models can read ^[16].

runtimewire's own assessment is that OpenProposal's value depends on adoption while overlapping agentic advertising standards compete for buyers and publishers ^[18]. The article does not name one of those competitors ^[22], so the competitive question cannot be settled from this record. The handoff into AdCOM, OpenDirect and Deals API ^[7] makes the first integration a schema mapping for sellers already on those standards. And the thirty days between the September 22nd release and the October 22nd close of comment is the window in which the schema can still change ^[20].