At Bitfinex, you can trade 35 currency pairs, which include the US dollar, as well as the most liquid at the moment, crypto-currencies. Commission for operations depends on their monthly volume and is up to 0.2% for the buyer. In addition, the exchange has a commission for withdrawing funds, which depends on the specific currency and is 0.0004 bitcoins or 0.1% of the amount (minimum $ 20) when withdrawing in dollars. To register, trade or transfer from a crypto-cheater it is not required to indicate personal data, however, when placing funds in dollars or withdrawing them to a bank account, verification with the provision of documents is required.