public void PlaceLimitOrder_Test()
        {
            var orderParams = new LimitOrderParams
            {
                ClientOid = Guid.NewGuid().ToString(),
                Pair      = "ETH-BTC",
                Price     = 0.00002M,
                Side      = Side.BUY,
                Size      = 2
            };

            var orderId = _service.PlaceLimitOrder(orderParams).Result;

            Assert.NotNull(orderId);
        }