It is unclear if Coinbase will accept Sumcoin at this time. Sumcoin is not currently listed on Coinbase, and there is no official word from Coinbase about whether or not they will accept Sumcoin in the future.
This leaves many Sumcoin holders in a difficult position, as they are unable to sell their coins for fiat currency or convert them into other cryptocurrencies.
There are a few possible reasons why Coinbase has not yet listed Sumcoin. It is possible that Coinbase is still evaluating Sumcoin and has not made a decision about whether or not to list it.
It is also possible that Coinbase has decided not to list Sumcoin, but has not made an official announcement yet. Either way, it is unclear what the future holds for Sumcoin on Coinbase.
In the meantime, there are a few other exchanges that do list Sumcoin. Bittrex is one of the most popular exchanges for trading altcoins, and it currently lists Sumcoin.
There are also a few smaller exchanges that listSumcoin, but trading volumes are very low. This means that it may be difficult to convert your Sumcoins into other currencies, as there are not many buyers.
Overall, it is unclear if Coinbase will accept Sumcoin at this time. There is no official word from Coinbase, and the situation is fluid.
If you own Sumcoins, you may want to hold onto them for now and watch for any announcements from Coinbase about their plans for Sumcoin.