Fuse Multi ERC20 bridge is used to relay the ERC20 tokens between Fuse and Ethereum networks.
This bridge is two layer bridge. In the base level the Arbitrary Message Bridge (AMB) is responsible for relaying messages between the networks. On top of the AMB, the pluggable mediators implement a contract logic of token relaying of various assets. More info https://docs.tokenbridge.net/amb-bridge/about-amb-bridge