How to block a lost American Express credit card immediately?

The 'minimum due' trap is real. Banks love it because they charge ~36-42% interest on the carried-forward amount. If you can't pay the full bill this month, pay at least 50% — anything below that and the interest eats the rewards of the next 6 months.

Don't blindly apply based on YouTube recommendations. Pull your latest CIBIL score first — most premium cards need 760+. If your score is in the 700-750 range, start with a lifetime free card and upgrade after 12-18 months of clean history.

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.