Where does Coinify get its Bitcoins, and can I track their exchange rate somewhere?
I asked them in an email and they provided me with the following response:


  ... we use a Volume-Weighted Average Price (VWAP) over multiple
  exchanges (not CoinJar though as the Wikipedia article said) to get an
  average rate that reflects most of the BTC exchange rate market.
  https://en.wikipedia.org/wiki/Volume-weighted_average_price


and


  ...each order you make will be processed with the best exchange rate we
  can find at the moment.