Among the six different protocols, there are some similarities and differences. Perpetual protocol and shield are perpetual contracts using different algorithms. Perpetual protocol uses a product as an invariance to stabilize the system, while shield limit the amount of money a trader needs to pay in order to trade, thus, limiting the maximum loss. Futureswap has similar features to Antimatter, because it has dynamic fees to protect the platform. On the other hand, the dynamic counterpart in Antimatter is the cost to produce tokens. The difference is that Antimatter has price floor and price ceiling. It preserves the feature of a straddle(options), but Futureswap does not. Hegic Options is not a perpetual option. one can only hold it up to 90 days. Therefore, the mechanisms is much different to Antimatter. Everlasting Options is perpetual future for options. Since options has many strikes, Everlasting Options has many ramifications. In essence, it s futures rather than options. The big difference is that Antimatter does not rely on oracles, while the other six do. Thus, Antimatter reduces the possibility that one takes advantage of time lag.