If you’re worried about Helix exposing you to coins that may have gone through the darknet, you can rest easy. Once you become a Helix member, Grams will enable you to use their regular service instead of Helix Light. The only downside is there’s no way of figuring out which is which so you’ll just have to take their word for it. It costs 0.01 BTC to become a member of Grams aka Helix.