Ok, modders I needed to know how to make a block that exchanged blocks aka a "Grand Exchange"
say one diamond is 250 blocks of dirt or 5 blocks of dirt is one cobblestone and one coal and cobblestone is stone,
to get down with the point, I wanted how to mod a "trading" Block that will let me trade say dirt blocks for cobble stone or what not..just wondering if i could get help please :) Thanks for taking your time to read my wonderful idea :)