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Are there alternatives to double currency account to manage payments in different currencies?
You could use a Credit or Debit Card running in US $, drawing from your US$ account, and pay everything with it. If you pick a company with free foreign conversions, you would get the standard interbank exchange ratio every time you pay, with no fee. For the small payments where credit cards are not accpeted or useful you can convert some cash once every some month - all significant amounts should work with credit or debit card.