Opyn primer on the Crab primitive (as a first-class citizen)

Crab is an active strategy within Opyn's Squeeth protocol, built from a short 2-perpetual (also known as Squeeth) and a long 1-perpetual, and it makes money when markets move sideways. An upgraded version is planned for Opyn's new protocol, which is soon to be released. Over a day, its payoff is described as resembling a rainbow, with the largest return if the market does not move at all. Returns turn negative if the market moves too much up or down.