How low can a purchase APR be?

[Dadof31978]

Disclaimer 1: I have never paid a penny of interest and never will, but my USAA card that's 21 years old that gets 1.5% cash back..it was originally 1% back.

Regular APR (Annual Percentage Rate)  on new transactions

8.50% (Prime + 3.75%)

[ElizabethKate]

@Aim_High Thank you for your service 🙏🏼 my grandfather, father & brother are all AF vets & the Navy & Marines are also family favorites to enlist in!

Always appreciate reading your insights, I learn so much, & your super detailed knowledge is just priceless, many thanks for sharing!

[galahad15]

All excellent points and info by @Aim_High and the other posters on the thread! 

Just my humble opinion, but ideally in my own personal experience, I would prefer a very low fixed-rate card (lol yes, I do know that they can always be raised or converted to variables rates, although not retroactive to existing balances), to a very low variable-rate card.  Also even if the low-APR, fixed-rate card is slightly or marginally higher than the lowest-available, variable-rate APR. 

Main reason is because prime rate historically can be and has been relatively volatile, with both high-highs and low-lows -- according to this link that has a table of historical prime rate values, the all-time high so far was on 12/19/1980, at 21.50%