There is no minimum amount required to make a transfer to another YouTrip user using YouTrip Send, as long as your wallet contains a sufficient amount of the currency you intend to transfer. If you don't have enough of that currency, make a top-up or in-app currency exchange.
The maximum transfer amount at each time is S$1,000 (or its currency equivalent). You may transfer up to a total amount of S$20,000 (or its equivalent in other currencies), which is the maximum amount a YouTrip wallet can hold at any point in time. Accordingly, your transfer will be automatically blocked if the amount transferred causes the receiver's wallet balance to exceed the maximum wallet limit of S$20,000.