The Betvio777 slots API allows you to easily integrate your platform with over 20 of the world's leading slot providers, including Pragmatic Play, PG Soft, CQ9, Red Tiger, Habanero, Booongo, Quickspin, and more.
Only 20 providers... I can't say that sounds too exciting. The bigger crypto casinos have many more providers listed, so 20 providers might be good for a start, but more need to be added later. Also, your short list is missing a lot of popular names, and I am far from impressed... I guess you can start with adding NoLimit, Push, Relax, Hacksaw, BGaming, and some others.
If you want to be taken seriously, you have to take yourself more seriously and offer more & better than others.
Good luck with your service.