Credit card reward points expiry — what is the validity period?

Forex markup comparison: Amex = 3.5%, HDFC Infinia/Diners Black = 2.0%, Axis Atlas = 3.5% but with milestone fee waivers, ICICI Emeralde = 3.5%, Standard Chartered = 3.5%. If you travel more than twice a year, the math favours Infinia or Diners Black.

Honestly, the annual fee is on the higher side. But if you spend consistently on the accelerated categories, the cashback more than offsets it. I did the maths on my own statement last year and came out ahead by about ₹3,200.