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Lead DevelopmentFACT · 4/5•24 Sept '26•Via Adweek

Apostra Bets on Agentic Ad Layer

Scope3 has rebranded as Apostra, pivoting from its original carbon emissions calculator mission to focus on enabling agent-to-agent ad buying and selling. The company, led by adtech veteran Brian O'Kelley, has been building agentic advertising infrastructure since early 2025, including the Ad Context Protocol (AdCP) open standard and a platform that allows AI agents to negotiate and execute media buys. Apostra has already managed $1.2 million in media spend over the last three months, with clients in the U.S., U.K., France, Brazil, the Netherlands, and South Africa. The company faces competition from the IAB Tech Lab's AAMP 3.0 standard, which also aims to standardize agentic media buying. O'Kelley acknowledges the shift away from sustainability but argues AI is the biggest growth area. The article questions whether the industry needs such a neutral layer or if open standards suffice.

•Scope3 rebranded to Apostra, shifting focus from sustainability to agentic advertising.
•Apostra's platform manages $1.2 million in media spend over the last three months.
•Apostra launched Ad Context Protocol (AdCP) as an open standard for agent-to-agent media transactions.

Entities:LiveRamp Scope3 Index Exchange Digiday Optable

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