Index Exchange

One of the largest independent SSPs globally, known for transparency and publisher-first approach

Index Exchange is a global supply-side platform (SSP) and ad exchange founded in 2001, headquartered in Toronto, Canada. The company enables digital publishers and media owners to monetize their advertising inventory through real-time bidding (RTB) and programmatic direct channels. Originally founded as Casale Media (late 1990s), the company rebranded from Casale Media to Index Exchange on January 28, 2015 to reflect its evolution into a full-scale programmatic exchange. It operates one of the largest independent ad exchanges in the world, processing billions of ad auctions daily across display, video, mobile, and connected TV (CTV) formats. Index Exchange differentiates itself through a strong commitment to transparency, quality, and publisher-first principles. The platform provides publishers with granular reporting, auction-level data, and tools to control how their inventory is sold. On the demand side, it connects with hundreds of demand-side platforms (DSPs) and media buyers, offering access to premium, brand-safe inventory. The company has been a vocal advocate for supply chain transparency, supporting initiatives like ads.txt, sellers.json, and OpenRTB standards. In the AdTech ecosystem, Index Exchange is considered one of the top-tier independent SSPs, competing directly with Magnite, PubMatic, and OpenX. Its independence from large media conglomerates is a key selling point for publishers concerned about conflicts of interest. The company has expanded significantly into CTV and video advertising, reflecting broader industry shifts toward streaming and digital video monetization. Index Exchange is privately held and has maintained profitability without relying on external venture funding.