Swap failed but gas was charged: what happened?

A swap that reaches the blockchain can fail and still consume gas. You pay for the execution work performed before the failure; a successful token exchange is not a condition of that payment. First confirm that the charge belongs to a mined, failed swap. A successful approval followed by an unsubmitted swap is a different situation.

Establish what actually failed

Open the transaction hash on the explorer for the network you used. Check the sender, block number, transaction status and fee. For an EVM receipt, status: 0 identifies a failed top-level execution; status: 1 identifies a successful one. The receipt-status specification also explains why using all the gas is not a reliable test of failure.

If the hash is only pending, there is no final execution result yet. If your wallet never produced a hash, do not assume its error proves that a paid onchain failure occurred. Check the account’s recent transactions before submitting another swap.

Read the transaction action as well. Uniswap’s missing-token guidance specifically distinguishes an approval from a swap. An approval can confirm and cost gas even though you have not exchanged anything.

What happens to the input tokens?

For an ordinary same-chain swap whose entire transaction reverts, the token transfers and contract state changes inside that failed execution roll back. The network fee does not. The REVERT specification describes this rollback and allows execution to return an error reason without necessarily consuming every remaining gas unit.

A separately confirmed approval remains a separate transaction. Its success is not undone by a later swap failure. Likewise, a cross-chain operation can involve multiple transactions; a failure on one leg does not establish that every earlier leg rolled back. This article’s rollback explanation applies to the failed same-chain transaction itself.

Check the actual charge, not the maximum estimate

On Ethereum, the execution fee is gas used multiplied by the effective price per gas. Your wallet’s maximum fee estimate can be higher than the final charge. Ethereum’s gas documentation distinguishes the execution budget from the price paid for each unit.

Hypothetical example: a transaction uses 120,000 gas at an effective price of 2 gwei. Its execution fee is 240,000 gwei, or 0.00024 ETH. This is arithmetic, not a current fee estimate. Other networks can have different fee components, so use the explorer’s final fee breakdown for your actual chain.

Find a reason before paying for another attempt

Uniswap documents several of these failure conditions, including slippage, deadlines and token incompatibilities. A generic “execution reverted” label is not enough to choose a remedy. If the reason remains unclear, retain the hash, chain, token contracts and application error for official support.

Can the gas fee be refunded?

The wallet cannot reverse a confirmed network charge. MetaMask explains that it does not receive this gas payment and cannot refund it. Any separate service reimbursement would depend on that service’s stated policy; it is not a reversal of the blockchain fee.

Before retrying, identify both the failure condition and the change that addresses it. A fresh quote, corrected allowance or supported route can be relevant changes. Pressing the same button with the same unresolved condition can simply produce another paid failure.