MetaProtocols defines the sub-protocol of MetaID, which is used to agree on the payload format. It is permissionless. Developers can freely define the data responsible format they need, such as simplebuzz, paylike, paycommet, etc.
To this end, we have specially created a protocol square: https://metaprotocols.com. This is a platform that gathers building blocks that can be shared and reused on all chains to jointly build a MetaID world.