When you associate those accounts from where you can get $ credited to your paypal account, it will accept it. Even if it is 1$ there is no harm in transferring that amount to your paypal account. But if you had to withdraw the amount in your paypal account, you need to have atleast 100$ or Rs. 5000 (currency conversion keeps varying so you need to be careful while withdrawing). While doing so you will be prompted to assoiciate either your credit card or your SB account. I would suggest you go for SB account and the amount will be credited to that account after conversion. If the amount withdrawn is less than Rs. 5000 (I am not so sure whether the min withdrawal amount is increased now, as I have not accessed my account recently) then you will be charged Rs. 50 as charges.