I recently tried to swap LTC for RDD using the ChangeAngel website. It took about a whole hour to complete the swap. Went to the customer service chat to ask about my transaction, and by the time I asked my question, my swap had completed. Customer service was great. Taking a bit longer than other swap services, it is still a great service I would definitely recommend to others. Very easy to use and simple to sign up. Just an email and password required. Or you can use AntumID through DigiByte. The coins I'm interested in are all supported. DGB, LTC, ETH, RDD, BTC, USDC, and TUSD.