Massarius

Massarius sits between supply and demand in the programmatic advertising chain. On the supply side, it helps independent publishers monetise inventory through SSP integrations, yield optimisation, pricing control and subscription tooling. On the demand side, it packages curated inventory and managed buying services for advertisers and agencies, adding campaign trafficking, optimisation, reporting and quality controls. This creates value by improving publisher revenue outcomes while giving buyers access to controlled inventory and operational support.

Massarius is a Dutch adtech company that operates a publisher trading desk and programmatic advertising business for independent digital publishers, advertisers and agencies. Its core offering combines publisher yield optimisation, SSP integration, subscription monetisation support and campaign management tooling, while also providing curated inventory access and managed programmatic buying for demand-side customers.

The company appears to make money through a mixture of revenue share on publisher monetisation, managed campaign services for advertisers and agencies, and software-like access to operational dashboards. Its customer base is primarily B2B: digital publishers seeking higher yield and subscription support, and advertisers or agencies seeking brand-safe, managed access to curated inventory.