The ride-hailing firm is now free to change its pricing policies and driver commission rates as the new P2P framework begins to take effect.
The Competition and Consumer Commission of Singapore is seeking public feedback on Grab's application to impose a platform fee on riders.
Ride-hailing firm Grab has decided not to appeal against an anti-competitive penalty, and will pay the $6.42 million fine imposed.
Observers have welcomed the Competition and Consumer Commission of Singapore's decision on the Grab-Uber deal but said regulations should be clearly defined.
Grab noted that there is no obligation for it to inform the Competition and Consumer Commission of Singapore of the merger, though it did so.
Grab was fined about $6.4 million while Uber was fined about $6.58 million by the Competition and Consumer Commission of Singapore.
Ride-hailing firm Grab will submit a written representation appealing against the consumer watchdog's decision on its acquisition of Uber's business.
The Competition and Consumer Commission of Singapore has determined that Grab's acquisition of Uber is an infringement of competition laws.
Singapore's competition watchdog said it has noted the news of potential new entrants into the ride-hailing industry, as it continues its probe into the merger.