A lot of people get confused about the two fees when swapping on STON.fi.
The first is the TON network fee. This is what pays for processing the transaction on the blockchain. STON.fi can reserve up to 0.35 TON to make sure the swap goes through, especially when network activity increases. In practice, the actual network cost is often much lower, around 0.06 to 0.09 TON. Any unused amount from the reserve is automatically returned to your wallet after the swap.
Think of it like a temporary hold. A larger amount is reserved first, but you only pay for the gas actually used.
Then there is the pool fee. This is set by the liquidity pool and is commonly around 0.30 percent of the swap amount. Approximately 0.20 percent goes to liquidity providers, while 0.10 percent goes to the STON.fi protocol. You can see the fee clearly in the interface before confirming your transaction.
One thing beginners often overlook is the TON needed for the network fee. Even if you have enough tokens to swap, your transaction can fail if your wallet does not have enough TON for gas.
That is why I prefer keeping around 1 or 2 TON available. It gives you plenty of room for multiple swaps and provides a buffer when network activity increases.
The reservation system makes things much easier because it reserves enough upfront and automatically sends the unused balance back to your wallet.
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