Platinum
I'm sure they lowered the price, it's not that simple to simulate something with 100% accuracy, let alone simulate something as big and complex as a constellation, I believe that because he's an unparalleled genius and the empress is keeping an eye on him, the price was lowered by at least 1 million or 1 billion times the price the real which should be 1 trillion or 1 quadrillion because the energy expenditure is simply incredible, so much so that I think that if a peak legend tried to pay for an hour of simulation, he would sure it would go bankrupt