The exchange limit would vary for different currencies. This amount would be reflected accordingly before you proceed to make the internal exchange.
For reference, below are the respective amounts:
Currency | Minimum Exchange Limit | Maximum Exchange Limit |
SGD | 0.01 | 200,000 |
HKD | 0.01 | 1,000,000 |
EUR | 0.01 | 150,000 |
GBP | 0.01 | 120,000 |
USD | 0.01 | 155,000 |
AUD | 0.01 | 200,000 |
JPY | 1 | 18,000,000 |
CHF | 0.01 | 140,000 |
THB | 0.01 | 5,000,000 |