MacMaster said the decision was made in recent days following months of discussion. Those talks included "extensive discussions" with his cabinet colleague Brian Comer, the minister responsible for addictions and mental health, and officials from Comer's office.
Through those talks, MacMaster said it became difficult to overlook how prevalent online gambling has become.
"People are gaming on sites quite literally from just about anywhere in the world," he said.
"There's no guarantee of payouts and there's also, you know, very little in the way of protections for people who, you know, may become addicted to them and have other problems with them."
Having a Nova Scotia-based operation means people in the province who want to gamble online have a safe and secure place to do so, said MacMaster. The website includes a link to so-called play wise tools, which can allow a player to limit the amount of time and money they spend on the site.