The brokerage/commission rates for US stocks and ETFs are as follows:
For Basic Users: 0.25% of the dollar amount per trade ($35 maximum)
For Premium Users: 0.15% of the dollar amount per trade ($35 maximum)
While in the case of OTC stocks:
For Basic users: Commission is charged at 0.5% of the dollar amount per trade
For Premium users: Commission is charged at 0.25% of the dollar amount per trade