Quran claims that Muhammad (saw) performed no supernatural, verifiable miracles apart from the inspiration that he received.
The unbelievers say, 'Why has a sign (ayatun) not been sent down upon him from his Lord?' Thou art ONLY a warner, and a guide to every people. S. 13:7
They also say, 'Why has no sign (ayatun) been sent down upon him from his Lord?' Say: 'Surely God is able to send down a sign (ayatan), but most of them know not.' S. 6:37
Does this contradict with the hadith literature that narrates authentic reports of Prophet Muhammad (saw) performing miracles? For example, the splitting of the moon, spitting in the food so it feeds many people, water flowing from his fingers, spitting in the eye to heal it? etc etc