As part of the agreement, hundreds of the Rubicon Project's US publishers, including news and culture site and photo-sharing site , will be able to sell ad space to advertisers in the UK. Only UK users will be able to view the ads.
Michael Stephanblome, founder and chief executive of AdJug, said: "Our partnership with the Rubicon Project marks a giant leap forward for AdJug by offering immediate access to a new breadth of quality ad inventory.
"This instantly helps us to bring additional liquidity into our marketplace and creates new and exciting inventory opportunities for our advertisers."
The Rubicon Project's Certified Ad Space program deciphers ad inventory from thousands of sites, breaking it into micro-segments based on geographic, demographic and contextual information.
The technology then matches the inventory to the strengths of a specific ad network, bringing that network "smarter" ad impressions.
Frank Addante, chief executive and founder of the Rubicon Project, said: "Partnering with AdJug in the international advertising market allows us to engage quality advertisers from the UK, while increasing revenue for our publishers.
"International monetisation is a rapidly growing opportunity and, therefore, is a key focus for us."