Phantom typically recommends keeping at least 0.05 SOL in your wallet to ensure transactions (including swaps) go through smoothly. This acts as a buffer to cover network costs
A Simple Example:
Suppose you want to swap $10 worth of USDC for another token:
Phantom fee: 0.85% of $10 = $0.085 (converted to SOL, e.g., about 0.0005 SOL at current prices).
Network fee: Around 0.001 SOL per transaction (could be 1 or 2 transactions).
Total estimate: 0.002 to 0.005 SOL, plus a small buffer (e.g., 0.01 SOL).
Conclusion:
For swapping a token in Phantom, usually 0.01 to 0.05 SOL is sufficient, depending on the transaction size and network conditions. I’d suggest keeping a little extra (e.g., 0.1 SOL) in your wallet to avoid any issues. The price of SOL also matters, as the dollar-based fee is converted to SOL