I have made more than 45 transactions at AE and paid from SCB debit card and Bank Al Falah credit card.
As compare to SCB online transaction charges, BAF charges are very less. BAF is charging around 40 - 50 paisa per USD.
Here are my some transactions of BAF just for your easy reference.
24 Apr 16 USD 21.51 RS.2,267.15 (EX RATE 105.3998)
24 Apr 16 USD 0.69 RS.72.73 (EX RATE 105.4057)
24 Apr 16 USD 15.25 RS.1,607.35 (EX RATE 105.40)