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On Solana, every account must maintain a minimum balance of SOL as “rent”, which ensures the network can sustainably store its data and prevents inactive or unused accounts from occupying onchain space indefinitely. In GLAM, account creation costs are always covered by the operator, technically referred to as the fee payer when constructing a transaction (such as the vault owner or delegate). When an account is closed, the recovered SOL is returned to the current operator. This design ensures that operational funds remain separate from the vault’s asset valuation and prevents commingling of funds.
Some accounts cannot be closed due to underlying protocol limitations. For example, the Drift Vaults program does not provide an instruction to close Vault Depositor accounts, making the rent paid by the operator unrecoverable.