Swap transactions on STON.fi require Gram (formerly Toncoin) in your wallet to cover blockchain fees. The exact amount depends on the swap route, pool configuration, and complexity of the transaction.
- The actual blockchain fee for a typical swap is usually around 0.02 Gram.
- To execute the transaction safely, STON.fi reserves approximately 0.3–0.35 Gram at the moment of the swap.
- Any unused portion of that reserved amount is automatically refunded to your wallet after the swap completes.
You can see the estimated fee in the Swap Details section before confirming the operation. Always keep a small amount of Gram in your wallet for fees.