Direct exchange of ETH for cash BGN is not only a matter of technical implementation, but also of financial benefit. The main criterion for choosing a suitable exchange office is the rate, especially if the transaction amount is large. It is important to monitor not only the current rate, but also the availability of a sufficient reserve, especially in the case of cash transactions. An exchanger offering a fixed percentage and a clear calculation mechanism saves the client from unexpected losses and delays. At the same time, the withdrawal conditions are critical: is identification (KYC) required, what limits apply, how is the identity verified and in what online or offline mode the transfer is made. Additional attention should be paid to the commission for the Ethereum network, especially during periods of its load.