code: public CoinbasePrice getCoinbaseSellPrice(Currency base, Currency counter) throws IOException {
  
      return coinbase.getSellPrice(Coinbase.CB_VERSION_VALUE, base + "-" + counter).getData();
    }
docs: Unauthenticated resource that tells you the amount you can get if you sell one unit.
  
  @param pair The currency pair.
  @return The price in the desired {@code currency} to sell one unit.
  @throws IOException
  @see <a
  href="https://developers.coinbase.com/api/v2#get-sell-price">developers.coinbase.com/api/v2#get-sell-price</a>