GMO SSP is a publisher-focused advertising platform from GMO NIKKO, designed to help media owners maximize the value of their ad impressions. It combines demand from multiple DSPs and ad networks, supporting header bidding, real-time bidding, and ad network delivery. The platform can display multiple ad opportunities together, helping increase bid participation and the likelihood of winning.

GMO SSP supports a range of formats, including in-feed, display, overlay, and interstitial ads, across smartphones, desktop, apps, and AMP. Its services include automated revenue optimization and personalized support, with dedicated staff advising on ad design and placement, adjusting network allocation, and negotiating bid prices. Publishers can block unwanted ad categories, manage ad approvals, and configure direct-sold advertising through the platform. GMO NIKKO also operates TAXEL byGMO, a recommendation widget intended to suggest relevant content and encourage visitors to explore more of a site. The company states that implementation and use are free. It is also developing additional header-bidding formats and approaches suited to environments with fewer third-party cookies.