When users perform an instant buy/sell on the Alluma platform, a market order is created on our trade page. If there is an exact match, there will no difference. However, in the case that the buy/sell order is larger than the best offer/bid available, then part of your order will match with the next best bid/ask. This will create a difference, or slippage.
To minimize slippage, some traders keep order sizes low and execute a set of smaller orders vs. one larger one.
Alternatively, limit orders can be used on the Alluma web version to guarantee a price that matches the order.