Well, OSL exchange is a centralised exchange which was founded in 2018. The exchange exhibit most, if not all the characteristics of a centralized exchange:
• Processing about 200,000 transactions every second, though this is isnt very high when compared to other centralised exchanges.
• Liquidity on this exchange is very deep, probably because Bitcoin and all of the major altcoins are being traded in the exchange. Even the shared order book technology is a major contributor to the liquidity on this exchange.
Well the exchange claims to have a 24/7 customer support but i wouldn't agree with that statement, I remember filing out a complaint which was not attended to until several days after my initial request.
Being a member of the blockchain association of Singapore, i can surely say that this exchange can be trusted though i am not giving a 100% guarantee.