package Ġio . ex zo coin . wallet . modules . market . list Ċ Ċ import Ġio . ex zo coin . wallet . modules . market . Market Item Ċ import Ġio . ex zo coin . core . entities . Currency Ċ import Ġio . reactivex . Observable Ċ import Ġio . reactivex . Single Ċ Ċ interface ĠI Market List Fetcher Ġ{ ĊĠĠĠ Ġval Ġdata Updated Async : ĠObservable < Unit > ĊĊĠĠĠ Ġfun Ġfetch Async ( currency : ĠCurrency ): ĠSingle < List < Market Item >> Ċ } Ċ