I think you're over-complicating this. Buy Amex gift cards for 2.25% cash back and net about 2% cash back after fees. Then use them to pay your mortgage for 1.99% in fees. Net result is that you increased credit card spend with no net fees.
Originally Posted by
Iridium7777
so i'll do some maths outloud:
buying gc through cashback portals you probably come out even in fees/rebates so you're getting a 1.99% hit from plastiq. ....