Why copying a failed swap transaction can fail again

Copying a failed swap’s data does not refresh the trade. It can preserve an expired deadline, an unreachable minimum output or a route built for old liquidity conditions.

Separate fee changes from instruction changes

Transaction fee fields influence inclusion and execution cost. The encoded call contains the contract operation and its arguments. Ethereum’s transaction documentation treats those as separate parts of the request.

A wallet speed-up normally changes the fee bid while retaining the intended action. It is not a quote-refresh mechanism. If execution data is the reason for failure, copying it can produce the same result.

Rebuild through the genuine application

Start from the input and output contracts and desired amount. Request a current route, then compare minimum received, recipient, spender and fee. Universal Router documentation illustrates how encoded commands can include amount bounds, recipient and optional deadlines; different routers use their own formats.

Do not edit opaque transaction hex supplied in a chat to “fix” one field. An apparently small change may alter the authorization or make the payload invalid, and you may not be able to verify the complete result.

Keep the failed hash as diagnostic evidence. A new transaction should correspond to a specific correction, such as a refreshed deadline or corrected allowance. Repeating the old payload simply because it is available in an explorer skips the application’s current route construction and review process.