Gravity raises $30.5M to sell ads inside AI chatbots, agents

If AI chatbots are the next front page, someone is going to sell the ads on them. Gravity just closed a $30.5 million Series A co-led by Lightspeed Venture Partners and Committed Capital, The Next Web reports, bringing its total funding to $38.5 million.

What Gravity actually sells is a full-stack ad platform for AI apps: a demand-side platform for advertisers, a supply-side platform for developers who want to monetise their assistants, and an exchange connecting the two. On the buy side, Best Buy, Target, Vercel and MongoDB are named as advertiser clients. On the sell side, text-based ads are already running inside ChatGPT and a group of smaller assistants including Codebuff, EcoGPT, Daimon, Magneta, Runable and CTO.new.

The more interesting piece is a second product Gravity is testing: agent-to-agent advertising. Advertisers hand Gravity a product catalogue with features and current promotions, and when an AI shopping agent searches a category on behalf of a user, it gets served a list of relevant advertisers with detailed descriptions. "It helps enrich the buying decision," cofounder Zach Oldham told Business Insider, and the plan is to layer in direct payment so an agent can complete a purchase once the user approves. It is, in other words, an ad format aimed at software rather than humans.

Why this matters if you are not in adtech: the numbers other people are using to justify these rounds are enormous. WPP Media estimates marketers will spend $100 billion on ads within generative AI search globally by 2030, and OpenAI alone forecasts its own ad business will hit $100 billion by the same year. ChatGPT introduced ads in February and, per the reporting, crossed $100 million in annualised ad revenue within two months. That is the trajectory that turns a research lab into a media company, and it is why an infrastructure layer around it is fundable at all.

The honest caveat is that Gravity's revenue, its take rate, and its commercial terms with ChatGPT and the other assistants are not disclosed, and the article does not spell out how agent-to-agent inventory will be labelled or surfaced to end users, which is the first thing a regulator will ask. The bet worth watching is whether the long tail of smaller AI apps treats Gravity as their default monetisation layer while OpenAI keeps its own inventory in-house. If they do, this is a real business. If OpenAI decides third-party ad networks are competition rather than partner, it is a much harder story.