dgex is most secure but very slow. bter is fast, iv never had issues with bter and i always use it. crptsy is crap and having serious issues and i wouldnt advise using it. poloniex i havnt really used much, seems ok but has been hacked before(they paid back the last people that lost money)
I can buy it for usd?
for USD its advisable to buy at coinbase or another reputable exchange. but you will need to provide proof of identity in order to purchase with dollars. another option is to buy bitcoin from an american version of eircoin.net (i dont know what american ones there are, if any) and then send your bitcoins to one of the above exchanges to buy nxt. cryptsy accepts USD but only with prood of ID and they are not safe to use imo.
wow, what? coinbase wallet had add NXT? very good news for NXT and NEM!
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BoardAnnouncements (Altcoins)
Re: NEM - New Economy Movement - NEMstake Tokens Listed on NXT Asset Exchange