Poloniex is an exchange established in January 2014, with headquarters and legal registration in the US.
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It is a long-standing secure exchange and only allows cryptocurrency trading with cryptocurrencies
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Pros
Good security technology: Poloniex underwent a hacking attack in 2014. Since then, the exchange has been focusing more on security issues. So far, Poloniex has not experienced any more hacks.
Charge / withdrawal of coins is quite cheap
Cons
Poloniex trading platform support only uses English
Slow user support: Poloniex has received a lot of feedback and complaints because of the slow care and customer support.