Places ads in ChatGPT and other AI chatbots. WPP estimates $100B AI ad market by 2030. Gravity, an adtech startup that places ads inside AI chatbots, raised a $30.5 million Series A co-led by Lightspeed Venture Partners and Committed Capital. The company runs a full-stack ad platform: a demand-side platform for buying ads within AI chatbots and agents, a supply-side platform for developers to monetise their AI apps through ads, and an exchange connecting the two. The startup places text-based ads inside ChatGPT and several other AI assistants, including Codebuff, EcoGPT, Daimon, Magneta, Runable, and CTO.new.