I need to remind people that Amaze is "better", but not the best.Ya. But at least can get better forex, earn insta point and also citi miles.
1) They switched to using Mastercard rates over spot rates, which are fast to rise but slow to fall. The Mastercard USD rate right now is 1.338, while spot rate is fluctuating between 1.325 and 1.331 right now.
2) There is a ~1.6% markup on the Mastercard rate, which is offset by the 1% points back for purchases between $10 and $500.