Dfyn Network is a multi-chain AMM DEX. The team is building it to become an inter-connected AMM with nodes spread on different blockchains. As a result, those AMMs will be able to share liquidity and even enable cross-chain swaps. Dfyn is a true multi-chain AMM explicitly optimized for the cross-chain universe.
Polygon instance deployed of Dfyn is a gasless exchange where customers have to sign the transactions without any fees passed to users.