FOX is a loyalty token available to ShapeShift Members. The first 100,000 ShapeShift Members will receive 100 FOX as a gift, and currently, all Members earn FOX whenever they do ShapeShift trades. These grants are currently tracked in a Member's account, but the token cannot be withdrawn or moved (yet).
In the near future, the tokens will be distributed so you can send/receive your FOX (as ERC20 tokens on the Ethereum network). At that time, by holding FOX tokens, Members will get better prices on trades in the ShapeShift Platform. The more FOX tokens possessed by a Member, the more discounted exchange volume that Member can do per month. Stay tuned! More details will be available soon.
If you want to start earning FOX, sign up here.