There will always be fees in order to transfer your funds over a blockchain network.  A minimum amount is required in order to cover the cost of these fees.  If the amount you're trying to transfer is less than what the minimum fees allow, the transaction will fail due to not having enough funds to pay the fees.  You can keep tabs on the current fees which are available below:

If you have any questions, please reach out to our support team at:  support@spankchain.com