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First, check the transaction hash in the official Avalanche C-Chain Explorer. Its status tells you whether the transaction is still pending, failed, or final; the right next step depends on that status. Do not resend the same payment until you know what happened, because the original could still complete.
1. Confirm you are checking the right Avalanche network
This guidance covers the Avalanche C-Chain, not every Avalanche network or service. The C-Chain is EVM-compatible, uses Chain ID 43114, and has AVAX as its native token. Open the Avalanche C-Chain Explorer and search for your transaction hash. A wallet’s activity label alone does not establish the transaction’s on-chain state.
2. Check the transaction status and nonce
In the explorer, inspect the transaction status and record its nonce. The nonce is the account’s transaction sequence number; an earlier pending transaction can hold up a later one from the same account. Check whether there is an earlier pending nonce before trying to replace or cancel anything.
- Pending: The transaction has not completed. Use the controls supported by the wallet that sent it.
- Failed: The transaction did not succeed. Read its details and any wallet error before trying again.
- Final: The transaction is complete. Wallet replacement or cancellation controls cannot reverse it.
Do not create a second transfer just because the wallet looks stuck. If the first transaction later succeeds, the second transfer could send the funds again.
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3. If the transaction is still pending in MetaMask
Avalanche Support documents these options for MetaMask. They apply to a transaction that remains pending; they are not a way to undo a finalized transaction.
Speed up a pending transaction
Use MetaMask’s Speed Up action to resubmit the transaction with a higher fee. Check the fee shown by your wallet and current network conditions rather than relying on a fixed recommendation: the fee needed can vary, and the examples on the Avalanche Support page are examples, not a universal current setting.
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Cancel a pending transaction
Avalanche Support says cancellation is available only while a transaction is pending. If you used a custom nonce or have several pending transactions, work from the oldest pending nonce first. A later transaction can be queued behind an earlier one, and a later nonce cannot be cancelled before the earlier pending transaction.
4. If the transaction failed
A failed transaction is different from one that is merely pending. Check the transaction details and the error displayed by your wallet. Avalanche’s C-Chain transaction lifecycle documentation describes validation checks that include sufficient balance and a correct nonce. It also explains that an earlier transaction can change the sender’s nonce or available balance before a later transaction is included.
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Use the specific error and transaction details to determine what needs attention. These checks are diagnostic possibilities, not an exhaustive list, and the available documentation does not establish one fix for every wallet error. Avoid repeatedly resubmitting without resolving the issue shown.
5. If the transaction is final
A finalized C-Chain transaction cannot be cancelled or reversed. Avalanche describes C-Chain finality as fast and irreversible, approximately one second. If you sent funds to the wrong address, the transaction system has no mechanism to return them; Avalanche Support states this explicitly in its transaction explainer. A wallet’s speed-up or cancel control is for pending replacement, not reversal after finality.
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Why fees and pending times can vary
Fee behavior is network-dependent. Avalanche’s C-Chain utilization documentation says that, since Helicon on September 22, 2026, a block reserves each accepted transaction’s gas limit and charges the greater of the gas used or half the transaction’s gas limit. This dated change means older descriptions that say only actual gas used is charged may not describe current C-Chain behavior. There is no universal pending-transaction expiry interval established here; check the explorer and your wallet rather than assuming a transaction has timed out.
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The steps above are specific to C-Chain explorer checks and MetaMask’s documented pending-transaction controls. Other wallets may offer different replacement or cancellation steps. This guidance does not establish equivalent procedures for X-Chain, P-Chain, bridge transfers, or exchange deposits; use the relevant wallet, service, or network support channel for those cases.
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