Is there a limit to how much you can pay with Apple Pay in the US?

No since Apple has nothing to do with the transaction itself.....your bank decides on that

 

Most banks have a limit for purchases, like mine is $25,000 on a credit card

 

Gosh, thats a lot isn't it.

 

Yeah, before I requested that amount (to buy a car) the limit was $5000 they said it was to protect from fraudulent charges.

 

Petty u cannot a have "daily limit" on your credit card just like u can with personal accounts, although it should extent do withdrawals, not just transfers between accounts.