A token approval lets a swap service use a set amount of your token. After a failed swap, check whether the approval succeeded, whether it covers the trade, and whether it names the right token and service. This can show you what failed and help you avoid sending the same transaction twice.
What should you check before retrying?
- Approval status
- Token and network
- Approved amount and service
First, find the approval transaction in your wallet’s activity or a block explorer, a site that shows public transactions. A confirmed approval means the network recorded the permission. A failed approval did not grant it, even if you paid a network fee.
Next, check that you are looking at the same network and token as your planned swap. USDT on one network is separate from USDT on another. A token’s ticker can be copied, so compare its full contract address, a unique code for that token.
Finally, check the allowance: the maximum amount the service is allowed to take from your wallet. It must cover the amount you plan to swap. Also check the spender, the service address receiving that permission. An approval for a different service does not count.
Did the approval fail, or did the swap fail?
These are separate transactions, so one can succeed while the other fails. For example, you may approve 25 USDT, then have the swap fail because the price changed. The approval can still be active, while your 25 USDT remains in your wallet.
Open each transaction and check its status. If approval is confirmed but the swap failed, check the allowance before approving again. If it already covers your planned amount and names the right spender, another approval may be unnecessary.
For a wallet-based token exchange, Fermi swap is a decentralized option; the Fermi swap exchange explains the service. If you use it after a failed attempt, apply the same checks: confirm the approval and swap separately, then verify the token and network.
When should you try again?
Retry only after you know which transaction failed and have checked that the token, network, spender, and allowance match your next attempt. If the approval failed, you may need to grant permission again. If the swap failed, first check whether the reason still applies.
One common mistake is approving the token again after the swap failed. That can create extra permissions without fixing the cause. A large or unlimited approval can let a service use more tokens later than this one trade needs, so choose a smaller amount when that option is available.
A failed transaction may still cost a network fee, which pays for processing. Before retrying, check the failure message and your remaining balance. My practical tip: write down the failed transaction’s status and the spender address before making another change.