which app allowed you to trade on the otcbb 
no app allowed you to trade on the otcbb the otcbb was a price quoting service investors traded stocks via brokerage apps that had their prices quoted on the otcbb were otc stocks publicly traded otc stocks were traded without a broker or central exchange as they were generally too small to be listed on a formal exchange some otc stocks were considered publicly traded though some companies on the otc market were private companies 