How to check transaction fees on Optimism Mainnet
Check Optimism Mainnet transaction fees in your wallet or a block explorer before you send. The total combines an execution fee and an Ethereum data fee.
Vahe HakobyanEditor-in-chief
Updated Oct 6, 20263 min readFact-checked
On this page
- Check fees on OP Mainnet, not Ethereum.
- Optimism fees have an execution part and a data part.
- Preview the estimate before you confirm.
Optimism is an Ethereum Layer 2 network. It posts transaction data to Ethereum, which shapes the fee.
What you need before checking fees
Use OP Mainnet, not Ethereum Mainnet or another chain. A wallet or explorer on the wrong network shows the wrong fee. Optimism fees include an execution fee for computation on its chain and an Ethereum data fee for posting transaction data to Ethereum.
How to check Optimism fees step by step
Follow these steps before you confirm. The fee shown is an estimate, not a guaranteed final amount.
- 1Open your wallet or explorerOpen your wallet app or an Optimism block explorer.
- 2Set the network to OP MainnetCheck the network name. Switch if it shows Ethereum.
- 3Enter the transaction detailsStart the transfer in your wallet and fill in recipient and amount. Do not confirm.
- 4Read the fee breakdownLook for the execution fee and the Ethereum data fee. The total is an estimate.
- 5Preview the total estimateReview the total before you sign. Close without confirming if it looks wrong.
After checking fees: records and safety
After you send, save the transaction hash and fee details. The IRS treats crypto as property, so you may need records for tax reporting.
Frequently asked questions
The preview is an estimate. Execution costs rise with activity, and the Ethereum data fee can spike when Ethereum is busy. The explorer shows the final charge.
Optimism is a Layer 2, so it posts transaction data to Ethereum. The data fee is the share of that cost passed to your transaction. It is separate from the execution fee.
A failed transaction usually still costs fees because the network processes it and the work consumes gas. The explorer records the fee under the hash even if it reverted.
Yes. An Optimism block explorer shows gas prices and past fees without a wallet. To preview your own transaction, you usually use your wallet.
