I use Niyo by DCB, it's a prepaid card with zero markup. I also find it secure to use on international sites where OTP is not required as I only transfer the amount I have to spend to this card. It also has the option to lock online/ATM/POS Swipes transactions.
Like all other banks, it takes the price from Visa Exchange Rate which is 40-50paise more than current currency rate. And above all it's a lifetime free card
I bought QCY QS2 on 18th Oct worth $18.78 and it charged me ₹1342 and later gave a refund of ₹3 as FX Adjustment. On 15th Oct I made a purchase of $14.29 and I was charged ₹1015.77 and later FX Adjustment of ₹2.44 was charged.