How to cancel an Ethereum transaction

Under most normal circumstances, you cannot cancel or replace a transaction once it’s sent to the blockchain, since the transaction spends probably a limited amount of time in the transaction pool waiting to be mined.

However, during times of high gas prices and high transaction volume on the blockchain, your transaction might be stuck in the queue, pending to be mined into a block — this could take several minutes to days, depending on how congested the blockchain is.