Same happened to me a couple of days ago... My blockfolio showed 0 USD for my steem... but then I realized there was a problem on Binance API... so I changed to BITTREX and everything came back to the normality but, yes, it was scary :-)
Same happened to me a couple of days ago... My blockfolio showed 0 USD for my steem... but then I realized there was a problem on Binance API... so I changed to BITTREX and everything came back to the normality but, yes, it was scary :-)