We work with our partner Changelly to process exchanges. 

The amount of commission for the exchange transaction depends on the sum of transaction and consists of:

• network fee for processing the outgoing transaction. This fee goes to miners who confirm your transaction. We use Fast fee for outgoing transaction,
• network fee for processing the incoming transaction, this fee is deducted from the resulting amount,
• Lumi and Changelly commission for the exchange. It is included in the exchange rate you see before confirming the transaction.

Please note that we due to high volatility of crypto, the exchange rate is approximate and can change while the transaction is being processed. It means that the final amount can be a little different from what you expected. It happens because Changelly does't fix currency rates.