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AI agents now buy ads on their own, but two rival protocols still don't agree
Publication date: 26.09.2026
Quick take
- A buyer agent is AI software that finds ad inventory, negotiates prices and books deals for an advertiser within set limits.
- Agents already run in programmatic, connected TV and outdoor advertising, but two protocols compete: AdCP and IAB Tech Lab's AAMP.
- The savings data is still contested, and neither protocol has reached commercial scale.
A buyer agent is AI software that acts in place of a media buyer: it finds ad placements, haggles with a seller's agent and confirms the deal without stepping outside the budget and rules it was given. PPC Land put together a detailed glossary entry on it, and the dates and numbers there are more interesting than the definition.
Who already buys ads without a human
In October 2025, Scope3, Yahoo, PubMatic, Swivel, Triton Digital and Optable launched the Ad Context Protocol, or AdCP: a shared language for buyer and seller agents to exchange requests, with nine core tasks at launch. In December, Scope3 and Magnite ran the first live agent-to-agent test, and on April 27, 2026 Magnite released its own buyer agent, even though SpringServe already had a seller agent.
Outdoor advertising gives the clearest example. On May 27, Broadsign and the Dutch agency Draft Digital ran the first billboard campaign handled by agents from start to finish. Magnite and France's Amnet cut connected TV setup time by 70%.
Two protocols for one job
On February 26, 2026, IAB Tech Lab named its own initiative AAMP, Agentic Advertising Management Protocols. Version 2.0 added programmatic guaranteed deals in April, 2.3 added pricing provenance in late July, and 3.0 arrived on September 22 with an OpenProposal draft; public comments close on October 22. According to IAB Tech Lab COO Anant Singh on August 20, AAMP and AdCP overlap on thirteen functions. Their booking objects still differ, so two agents on different protocols simply won't understand each other.
| Question | AdCP | AAMP |
|---|---|---|
| Who launched it | Scope3, Yahoo, PubMatic and others | IAB Tech Lab |
| When | October 15, 2025 | February 26, 2026 |
| Latest version | 3.1 | 3.0 (September 22, 2026) |
Adform CTO Jochen Schlosser estimated that a custom integration with one SSP takes 250 to 350 days of work, against about 50 on a shared standard. That is why agents need one. On September 23, though, he also noted that neither protocol runs at commercial scale yet.
Cheaper, or just different inventory
DataBeat's June 2026 figures put the average CPM for conventional buyers at $6.95 and for agentic buyers at $6.13. A 13.4% gap looks like savings. PPC Land itself cautions that a lower CPM could mean smarter buying or simply cheaper inventory the agents land on by default. The article doesn't disclose DataBeat's methodology, so I wouldn't carry that number over to your own budget.
There are mundane costs too. Every tool call burns tokens, and Draft Digital had to fold twelve calls into one to stop the drain. A seller agent built by Magnite also leans toward the publisher by design, so whose side a buyer agent is on remains an open question.
For a Ukrainian advertiser this is still more of a map than a manual: similar logic already sits inside Performance Max, where an algorithm also spends your budget within set limits, and in the wider approach to Google Ads.
I'm curious who will be first to publish agentic and conventional bids side by side on identical inventory, because only then will that 13.4% mean anything.
