Neither Shapeshift nor Evercoin are partners right now, but using their API does not require anything special so a partnership is not required in the beginning. This is for version 2 of the payment system where we aim to allow vendors to accept any major cryptocurrency (not only Ethereum). The fees for using Bitcoin, for example, would be exorbitant because it would include fees charged by either Shapeshift or Evercoin, but only in the beginning. If we get enough volume of transactions going through either of these exchanges, then we will propose a partnership to get discounts.