OTC Markets
OTC Markets provides additional bid and ask information for OTC stocks as a supplement to the NASDAQ-sourced bid, ask, and trade information for OTC stocks. Level I data from OTC Markets includes additional inside bid and ask data for OTC stocks, while Level II data from OTC Markets includes additional inside bid and ask data for OTC stocks plus additional levels of depth for bid and ask for OTC stocks.

In order to subscribe to OTC Level I service, you must first subscribe to real-time data for NASDAQ Package 1, 2, or 3. In order to subscribe to OTC Level II service, you must first subscribe to NASDAQ Package 2 or 3.