I know how bond trading works on regular equity brokers. It is through the bid-ask system in the BSE/NSE cash markets, typically with other retail participants. Do OBPs follow the same mechanism, or use a different system? I’m asking because I’ve seen bonds listed on platforms like Wint Wealth and Grip Invest that never appear to be traded in the cash market, and they show parameters like ‘xx% sold,’ which don’t make any sense in the bid-ask model.