Equivalent Exchange

You touch a pile of metal currency within a 5-foot cube. That metal is converted into its equivalent value in another metal currency. As an example, it can turn a pile of 100 gold into 1000 silver, or the same pile into 10 platinum. The resulting currency can spill beyond the 5-foot cube if it would not fit in the space. 

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the size of the cube increases by 5 feet, for each slot level above 2nd.