code: public CoinbaseMoney getCoinbaseBalance() throws IOException {
  
      final CoinbaseMoney balance =
          coinbase.getBalance(
              exchange.getExchangeSpecification().getApiKey(),
              signatureCreator,
              exchange.getNonceFactory());
      return balance;
    }
docs: Authenticated resource that returns the user’s current account balance in BTC.
  
  @return A {@code CoinbaseAmount} wrapper around a {@code CoinbaseMoney} object representing the
  current user's balance.
  @throws IOException
  @see <a
  href="https://coinbase.com/api/doc/1.0/accounts/balance.html">coinbase.com/api/doc/1.0/accounts/balance.html</a>