Paying for their daughter Dream has been a bone of contention between the parents ever since they split at the end of 2016, just weeks after their daughter was born.
Last year, 32-year-old Rob filed documents to support that he could not continue with the payment schedule.
He has been at loggerheads with Blac, 30, ever since.
But The Blast has reported that there has been a breakthrough and the warring couple and their lawyer met for private mediation last month.
It has reportedly now been agreed that Rob will no longer be asked to pay thousands of dollars per month and instead they will both now pay all expenses when Dream is in their custody.