South Korean cryptocurrency exchanges are searching for developing profitable business models away from their reliance on fee-based trading.

They expect the fourth-quarter trading fees to fall 30-50 percent. Thus they are moving to de-list the questionable coins. Bithumb has blacklisted ROM, DACC, and AMO coins, accordingly advising investors to be careful in investing in their coins.

Coinone also put DATA, ENU, BAT, KNC, ZRX, REP, THETA, and TFUEL on an investment watch list. Coinone said these coins have a below-average trading volume, which might expose them to price manipulation.

A local exchange spokesman said, “We are moving away from volume-oriented business strategy.”

Bithumb listed 57 coins last year, but only 29 this year.

Coinone has premium service to its members whose trading volume is more than three billion won. Huobi Korea provides gift cards to customers depositing more than $100,000.