The CubeSat Mission for studying Solar Particles is a NASA Science Mission Directorate and Heliophysics Division funded 6U Interplanetary CubeSat Science Mission. CuSP is scheduled to launch in mid-2020 as a secondary payload on the SLS EM -1 (Exploratory Mission One) flight. CuSP is a pathfinder mission for Space Weather Research as it will be the first heliophysics science mission to be placed in heliocentric orbit outside the influence of the Earth's magnetosphere. CuSP features three complementary, miniaturized sensors to address two science objectives: study the sources and acceleration mechanisms of solar and IP particles in near-Earth orbit, and support space weather research by determining proton radiation levels during SEP events and identifying properties of ST ions that could help predict the arrival of strong CME-driven IP shock waves that produce geomagnetic storms.