One thing that can confuse beginners when using STON.fi is seeing different costs during a swap and assuming they are all the same type of fee.

They’re not.

There are two main costs to understand: the TON network fee and the pool fee.

First is the TON network fee. STON.fi may reserve up to 0.35 TON before processing a transaction, but that doesn’t mean you will actually spend the full amount.

The final network cost can be much lower, with any unused portion of the reserve automatically returned to your wallet after the swap.

Think of it as a temporary hold. A larger amount is reserved to ensure the transaction can go through, but you ultimately pay only the actual network cost.

Then there’s the pool fee.

A common pool fee is 0.30% of the swap volume. In that setup, approximately 0.20% goes to liquidity providers, while 0.10% goes to the STON.fi protocol. The applicable fee is displayed in the interface before you confirm the transaction.

Understanding this difference is important.

You may have enough tokens to complete the swap but still have the transaction fail if your wallet doesn’t contain enough TON to cover the blockchain fee.

That’s why keeping a small TON buffer is useful. I’d rather have enough available for network costs than try to calculate the exact amount needed for every transaction.

The main takeaway is simple:

Don’t focus only on the pool fee when considering the cost of a swap.

Know the difference between the blockchain fee and the trading fee, review the details before confirming, and keep enough TON in your wallet to cover network costs.

Once you understand these two fees, swapping on STON.fi becomes much easier to navigate.
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