There are currently two internal limits to be aware of:
The minimum amount you can load onto your child's Spriggy card is $1, and the maximum amount in $999.
Parent Wallet + Savings + Goals for the entire family
The maximum amount is $999.
The reason for the limits is due to anti-money laundering regulations. The removal of the balance limit (or the inclusion of cash out at ATM's) requires a higher level of identity verification of parents at signup.
We are in the process of testing our higher limits and ATM withdrawal feature, and these should be available in the next 2-3 months.