This is big news. Circle used to be best way to buy Bitcoins from 2015 to 2016. They had a popular app on the app store similar to coinbase but they didn't charge any fees. They lost a lot of support when they stopped selling BTC through their Circle Pay app but it's good to see them continuing to support crypto. Hopefully this will bring some more credibility to Polo as they had a pretty bad reputation before Binance and Bittrex became popular. Circle also has an iPhone/Android app in development called Circle Invest, which would be like Robinhood but they intend to support many more alts right away. I think this is big because now that they own the exchange, it's likely they will be able to support a much more broad selection on their upcoming app.