No, when you normally transact, Glint does not add a margin to your rate, you get the wholesale market rate we get from our liquidity provider, and we add a separate 0.5% fee. Which you can see in our app.
However, when markets are closed (e.g., on weekends), the markets can be extremely volatile or because of technical reasons Glint does not receive a market rate from our liquidity provider we do widen the spread to allow our clients to still trade but cover some of our risk of the markets being closed, volatile or while we assess the technical problem.
It is always your choice whether you accept the price or not.