[stpn]

What banks has this worked with for you?

I just tried to do this with chase, capital one, and citi. The first two only let you pay up to 10% more than your balance (balance, not credit limit) and citi only 7.5% - nowhere near 10x your credit limit.

[sanswork]

Amex has advised me to do this before when asking for an increase for a specific large one off purchase that I planned to pay off again straight away.