This paper examines the development of data infrastructure in Australian schooling with a specific focus on interoperability standards that help to make new markets for education data. The conceptual framework combines insights from studies of infrastructure, economic markets and digital data. The case of the Australian National Schools Interoperability Program is analysed, drawing on a corpus of web-based technical and promotional documents and supporting interviews. The paper shows that Australia has well-developed data infrastructure in schooling that is creating new relations between schools, school systems and commercial vendors within network markets for data-driven educational technologies.