code: @Override
    public String placeMarketOrder(MarketOrder marketOrder) throws IOException {
      WexExchangeInfo wexExchangeInfo = ((WexExchange) exchange).getWexExchangeInfo();
      LimitOrder order = WexAdapters.createLimitOrder(marketOrder, wexExchangeInfo);
      return placeLimitOrder(order);
    }
docs: Implementation note: this method calls placeLimitOrder with LimitOrder created from passed
  MarketOrder and either max price in case of BID or min proce in case of ASK, taken from the
  remote metadata cached in WexExchange