In 2015, he co-produced the single "Now & Forever" on Drake's album If You're Reading This It's Too Late alongside Eric Dingus released in February 2015. This feature put Jimmy Prime into the mainstream and gain an international audience. Jimmy Prime released his third mixtape Block Boy in July 2015 which saw a feature from Whiss on the track "Best One". The release also prompted photoshoot by Vice in the following month which gained them attention on a national scale. In an interview with The Fader, Prime stated that "Block Boy to me is just more than me being from the hood. No matter where I go in this world, no matter how much money I make, no matter where I am at in my career, society will always consider me a block boy" in regards to the naming of the album.
