The answer
Validators still perform work to process a reverted transaction. Gas can be consumed even if the intended smart-contract operation fails.
What to do next
Read the failed transaction status and error, confirm sufficient gas and correct network, and avoid repeating an expensive failed call without understanding why.
Etherscan
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Ledger hardware wallet
Relevant hardware-backed signing for supported assets; it does not eliminate gas fees, contract vulnerabilities or approval risks.
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Frequently asked questions
Does a reverted token swap still exchange the tokens?
Normally not; state changes revert, but the gas consumed is charged.