For the first swap transaction, you must have at least 0.0256 SOL in your wallet.
This is a DEX requirement.
You pay 0.0256 SOL to make your first LSTAR to USDC exchange. The money goes to create an account on the exchange. You do not pay this fee on further transactions because you already have an account. You can get this commission back if you close your account.
If you have any other questions, please email us at help@letmespeak.org - we'll be happy to help you.