Please remember the buyback is different to the Atomic Swap - NEVER USE AN EXCHANGE ADDRESS FOR THE ATOMIC SWAP.

For the buyback:

You need to use a STATIC WALLET ADDRESS that can RECEIVE the CRYPTOCURRENCY YOU HAVE CHOSEN. We can't make recommendations or confirm if the wallet accepts your chosen currency due to the sheer volume of options available so that will require independent research. 

If you are unsure if your wallet address is static you will need to connect with the organization that developed the wallet.