Can I exchange my Circles for Euros or Dollars? Does it have an exchange rate?

No, Circles is not on the exchange market. We didn’t build Circles for that. Circles is a different type of money: it’s not meant to serve as a storage unit to get rich. It’s meant to be used for our basic needs. Technically speaking, you might be able to sell your individual tokens, but it depends on who is willing to give you Euros/USD/Bitcoin/etc for Circles tokens. As the system is based on a plurality of currencies, it’s meant for Peer to Peer (P2P) transactions.