risk free? How is it possible? What do you mean with unlimited upside potential and limited downside risk? How can I try on the testnet?
1&2) Shiled protocol is absolutely risk free because it uses a combination of a dual liquidity pool model, SLD (the native token of the platform), a decentralized brokerage system, and external liquidators to counteract the existing limitations. For in depth explanation you can read this medium post https://shield-dao.medium.com/introducing-the-first-risk-free-perpetual-contract-ca8331574ba7