Poloniex allowed margin trading on the coin until a flash crash wiped out 1,800 bitcoins worth $13.5 million at the time
Circle is moving the majority of its Poloniex exchange operations offshore, citing a "lack of regulatory frameworks" in the U.S.
Stablecoin issuer Tether accidentally created $5 billion-worth of its USDT stablecoin at the weekend, before promptly destroying them again.
The outage hit multiple major exchanges and information sites.
Circle is laying off roughly 30 people, CoinDesk has learned.
Poloniex announced it was opening institutional trading accounts as of Tuesday.
After yesterday's split of the bitcoin cash blockchain, several top exchanges have already accommodated the resulting two tokens.
Poloniex's new "pre-fork" trading service suggests that bitcoin cash users favor the more established version of the software, Bitcoin ABC.
Poloniex will be the first exchange to offer trading for the pending bitcoin cash (BCH) hard fork amid the debate that has raged since mid-year.
Blockchain startup Circle released its cryptocurrency listing criteria for its trading and investment platforms on Tuesday.