Financial Engineering Explained
Why Traditional Overdraft Fees are Outdated
Legacy financial institutions generate billions in punitive overdraft fees when users accidentally spend a few dollars over their balance. Modern fintech platforms use pre-execution atomic locks to either link automated secondary reserves or cleanly decline the transfer before penalties are incurred.
Pre-Debit Sufficiency Check
Server checks if `sender.balance >= transfer.amount` before executing database writes.
Zero Unbacked Mutations
If funds are insufficient, the transaction returns an informative error without corrupting ledger state.
