Here, we report a new approach for supramolecular lightdriven HER: an anionic Anderson-type platform-POM is covalently functionalized with a Pt(II)-complex HER catalyst. The compound is then electrostatically coupled in solution with a cationic iridium-photosensitizer (PS) to give the full supramolecular assembly. We demonstrate that in homogeneous solution, the system is capable of light-driven hydrogen evolution. Experimental and theoretical mechanistic studies show that the POM acts as PS-and catalyst-binding site, facilitating electron transfer under irradiation.