Every empty SPL token account (tip: An SPL token account is a tiny on-chain record that says 'this wallet holds X of this token'. Solana creates one automatically the first time you receive any token — so even tokens you got airdropped, dust from a swap, or memecoins you sold all leave behind an empty account. Each one's just a balance row + ~0.00204 SOL of rent.) on your wallet is sitting on ~0.00204 of rent (tip: Solana charges a refundable deposit (rent) to keep account data on-chain. Every SPL token account holds ~0.00204 SOL of rent for its lifetime. When you close the account, that rent flows back to the wallet — your SOL was never spent, just parked.). Forgot a coin? It's your SOL — let's get it back. One signature, batched on-chain, gas-only. No middleman, no hidden cuts.