CoinSwitch doesn't have amount restrictions. However, there are some nuances.
If an amount is too low, make sure that it will cover all the network fees a blockchain takes. It means that the amount you are going to send and the amount you are going to get should be enough to cover input and output network fees taken by a blockchain.
If your funds to be exchanged are insufficient, you will see a message.
Please stick with this recommendations. Otherwise, there is a high risk that your money will be lost.
Some exchanges provide a max limit as well.