From Adweek · Kendra Barnett · · 3m
Scope3 becomes Apostra, betting big on agent-to-agent ads
The sustainability startup is pivoting hard into agentic advertising infrastructure, but faces questions about whether the industry actually needs it.
In brief
The sustainability startup is pivoting hard into agentic advertising infrastructure, but faces questions about whether the industry actually needs it. Apostra is building infrastructure for AI agents to buy and sell ads autonomously, but its success depends on whether platforms will use its standard instead of…
Scope3 is now Apostra
The sustainability startup has rebranded to focus on agentic advertising infrastructure. The company will help AI agents autonomously buy and sell ads across digital, TV, and out-of-home channels.
From sustainability to AI growth
CEO Brian O'Kelley said sustainability is no longer hot under Trump's second term, and AI is the biggest growth area. Apostra will still operate its sustainability practice under the name Scope3 by Apostra.
“AI is simply the biggest growth area.”
O'Kelley defends the pivot
When pressed on appearing hypocritical, O'Kelley argued that trying to do good shouldn't invite cynicism. He said AI uses about 11% of all U.S. electricity, making it the biggest business around.
“I don't want to be held to a standard where trying to be good isn't good enough.”
Early traction in agentic buys
Apostra's platform has managed $1.2 million in media spend over the last three months, primarily from large companies. Agentic buys are already happening in the U.S., U.K., France, Brazil, the Netherlands, and South Africa.
Industry readiness is mixed
A Digiday and Optable survey found 31% of advertisers, agencies, and publishers are experimenting but fragmented, while 42% are early but moving quickly. Only 2% said they weren't ready at all.
Ad Context Protocol explained
O'Kelley helped architect AdCP, an open-source standard that creates a shared language between buying and selling agents. It helps agents find inventory, negotiate terms, and execute campaigns.
Competing standard AAMP emerges
The IAB Tech Lab launched AAMP, an open-source initiative to standardize agentic media buying. AAMP 3.0 was unveiled just a day before Apostra's rebrand and covers similar ground to AdCP.
The standards battle matters
AdCP and AAMP represent different visions for scaling agentic advertising. Both are racing to decide how agents discover, evaluate, negotiate, and transact media. Apostra's success depends partly on wider adoption of AdCP.
The middleman problem
If open standards like AdCP and AAMP work, every player in advertising can connect their own agents without needing Apostra. The bigger question is where money flows in agentic advertising.
O'Kelley remains bullish
Despite the challenges, O'Kelley says demand is growing and some clients are already planning significant expansion for 2027. He believes agentic ad buying is more scaled than most realize.
The big bet ahead
Apostra is betting that buyers and sellers need a neutral layer to connect their agents. If the tech works and gains traction, it could become indispensable to the adtech stack.
The takeaway
Apostra is building infrastructure for AI agents to buy and sell ads autonomously, but its success depends on whether platforms will use its standard instead of building their own connections.
