I performed few transaction with minimum amount but the status of those transactions in History tab are Failed, are my coins lost?? How can get my asset back?

The required minimum amount on the wallet is only estimation.It may change when submitting on the blockchain, sometimes it is bigger than the time when the user submit "exchange" button. Thus, in this case, the transaction will be failed and Changelly will refund coins to you. It takes time to refund.

In case you have waited several days but the coins have not been refunded to you, please provide us with the following information, we will contact Changelly regarding your case:

• The capture of your transaction details in History.
• Provide us the Send Address & Send Amount.
• Provide us the Receive Address & Receive Amount.
• Transaction Time