This document outlines a call for proposals to develop a Galileo-based timing receiver prototype for critical infrastructures. The objectives are to develop a receiver that can obtain Galileo System Time and UTC based on Galileo signals alone in single and multiple frequencies. The receiver should improve robustness. The proposal should include requirements definition, design, prototype development, testing, and dissemination. Testing will take place in a national timing laboratory or JRC facilities. The maximum budget is EUR 3.5 million for 2 projects. Proposals are due by April 13, 2018.