The minimum topup for the PEXX cards is 2 USD, with no maximum topup.
Below are the limits for spending/ATM withdrawals
PEXX Visa
Lifetime limit: $5,000,000
Weekly limit: $1,000,000
ATM withdrawal: $1,000/day, $20,000/month
PEXX Mastercard
Lifetime limit: $1,000,000
Monthly limit: $400,000
Daily limit: $50,000
Single transaction limit: $25,000
ATM withdrawal: $500 per day and per withdrawal, $15,000/month
These limits are subject to review, and may be adjusted based on business requirements