Spread
Bid–ask spread is the first cost. A second cost is the markup a retailer adds on top of mid. A third is a disclosed fee. Adding all three is how you compare two quotes that look like the same number.
Mid-market rate
Bid–ask spread is the first cost. A second cost is the markup a retailer adds on top of mid. A third is a disclosed fee. Adding all three is how you compare two quotes that look like the same number.