You will need to purchase rps to buy things for RPs and you can EARN ecash to purchase things from the IM (with the purchase using ecash button)


on the EM it will say RPs for everything its still 1:1 (ecash-rp) on the EM so if the zhen of old man mark costs 800 rps you can use 800 RP ($8) or 800 ecash (from selling your dagger of bad forges)