There are actually so many of the right now in the market and for the most popular one we have known about in this forum which is nitrogen sports, I would say there are so many more to come. Asides that, I believe there are even some that are not much publicized hugely which I somehow believe it is something that would have been in existence hugely considering that the esport gaming sector is a pretty big one and developers will most definitely want to tap into it when it comes to adding up cryptocurrency. The only one I am pretty much familiar with anyway is just Nitrogen sports.