public Task <List <Symbol> > Metadata_list_symbols_exchangeAsync(string exchangeId)
 {
     return(GetData <List <Symbol> >(CoinApiEndpointUrls.Symbols(exchangeId)));
 }
 public Task <List <Symbol> > Metadata_list_symbolsAsync()
 {
     return(GetData <List <Symbol> >(CoinApiEndpointUrls.Symbols()));
 }