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Cancellations

Transactions that are submitted to Flashbots Protect are sent to the Flashbots MEV-Share Node, where they may stay pending for up to 6 minutes.

Flashbots Protect allows you to cancel pending transactions by submitting a cancellation transaction to Flashbots Protect. You can cancel a transaction by sending a new transaction which:

  • Is submitted by the same address as the transaction that is being cancelled
  • Has the same nonce as the transaction which is being cancelled
  • Has the same from and to address
  • Has an empty data field

No cost to cancel​

The cancellation transaction is only used for authentication to ensure that you control the account that sent the transaction you want to cancel. This transaction will not be included on-chain and does therefore not have any cost.