SXC was removed from coinmarketcap.com, block explorer is down?
Not removed the block explorer is down. I am not aware of what the problem is, however servers hosting SXC services are undergoing upgrades, and disruptions can be expected.
I meant it was probably automatically delisted because block explorer is down for a while. Here is what coinmarketcap.com's owner said earlier:
I made it so that coins will be delisted after 6 hours of stale datapoints, it usually means there are block explorer issues.