Yes, you can top up your card using non-USD currencies such as Canadian Dollars (CAD) or Nigerian Naira (NGN).
To do this, simply fund your CAD or NGN wallet on the app, and then use those funds to top up your card. Please note that while you're funding with a non-USD currency, your card balance will always reflect in USD, as the amount is converted at the applicable exchange rate during the top-up process.