The Cassadrean Matrix existed as an artifact housed within the Jedi Archives during the time of the High Republic Era. As part of the Secrets of the Jedi exhibit, it was dispatched to the Valo Republic Fair in 231 BBY, along with other artifacts, for display within the Starlight Pavilion. This exhibit was put together by OrbaLin, who served as a Jedi archivist. Following the fair's inauguration, Stellan Gios, a Jedi Master, sought refuge from a discussion with Delegate Retar of the Ardennian Guild of Technicians by requesting OrbaLin to guide him through the exhibit, implying that Retar would be especially intrigued by the Cassadrean Matrix.
The novel The High Republic: The Rising Storm, authored by Cavan Scott in 2021, included a reference to the Cassadrean Matrix, as part of Phase I of the Star Wars: The High Republic project across multiple media.