Token
Chainlings aren't sure what's valuable but they will collect shiny objects and return them to you (tokens). Can't blame them, they're not used to our world. Individually, they aren't worth very much but will be useful in the future!
Once Chainlings begin to adventure with you, they will collect shiny objects and return those to you from their quests, playing, and work (staking, play-and-earn rewards, etc.).