OP Mainnet
Optimistic rollup on Ethereum and reference chain of the open-source OP Stack.
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OP Mainnet key facts
| Category | Layer 2 network |
|---|---|
| Chains | Ethereum L2 |
| Platforms | Web, API |
| Fees | Execution gas fee plus L1 data fee plus operator fee (after Isthmus) |
| Open source | Yes, MIT license (github.com/ethereum-optimism/optimism) |
What is OP Mainnet?
OP Mainnet is an optimistic rollup on Ethereum built with the OP Stack. Fees are an execution gas fee, an L1 data fee and, since the Isthmus upgrade, an operator fee. Transactions finalize in about 15 to 30 minutes, but Standard Bridge withdrawals wait 7 days for fault proofs.
OP Mainnet pros and cons
- Transactions finalize on Ethereum in about 15 to 30 minutes
- OP Stack code is public under the MIT license
- Forced inclusion from L1 if the Sequencer goes down
- Standard Bridge withdrawals are delayed 7 days
- Soft finality relies on a single Sequencer run by the chain operator
- Extra operator fee component after the Isthmus upgrade
OP Mainnet FAQ
What is OP Mainnet?
OP Mainnet is an optimistic rollup on Ethereum built with the OP Stack. Fees are an execution gas fee, an L1 data fee and, since the Isthmus upgrade, an operator fee. Transactions finalize in about 15 to 30 minutes, but Standard Bridge withdrawals wait 7 days for fault proofs.
Which chains does OP Mainnet support?
Ethereum L2.
How much does OP Mainnet cost?
Execution gas fee plus L1 data fee plus operator fee (after Isthmus), according to OP Mainnet’s own page (checked Sep 26, 2026).
Sources
How this page works
Sources: OP Mainnet: official site, OP: Transaction fees on OP Mainnet, OP: GitHub repository. Data as of Sep 26, 2026.
Not affiliated with any project listed. Educational content, not financial advice.