Optimistic Etherscan
Block explorer for OP Mainnet built by the Etherscan team, with L1 to L2 and L2 to L1 transaction views.
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Optimistic Etherscan key facts
| Category | Block explorer |
|---|---|
| Chains | OP Mainnet |
| Platforms | Web, API |
| Company | Etherscan (Built by Team Etherscan) |
| Chains | OP Mainnet, OP Sepolia Testnet |
| Pricing | Lite $49/mo, Standard $199/mo, Advanced $299/mo, Professional $399/mo, Pro Plus $899/mo |
| US availability | Available: terms name no country restrictions |
What is Optimistic Etherscan?
Optimistic Etherscan is the Etherscan team's block explorer for OP Mainnet. It lists L1 to L2 and L2 to L1 transactions next to regular blocks and contracts. Its API is Etherscan API V2, where OP Mainnet is a paid-tier chain: API access starts at the $49 a month Lite plan.
How Optimistic Etherscan works
Optimistic Etherscan indexes OP Mainnet and OP Sepolia.
Besides normal blocks, transactions and contracts, its menus list L1 to L2 deposits and L2 to L1 withdrawals, the L1 transaction batches and L1 state batches that OP Mainnet posts to Ethereum, cross-chain transactions, AA transactions and EIP-7702 authorizations. An L2 to L1 Relayer tool sits in the developer menu next to the Input Data Decoder, Verify Contract and the Vyper Online Compiler.
There is no separate OP API. You call Etherscan API V2 at api.etherscan.io with chainid=10 for OP Mainnet or 11155420 for OP Sepolia. Etherscan's supported chains list marks both as paid tier only, while source code and ABI endpoints stay open on every plan, including the free one. Both networks sit in the chain switcher at the top of every page.
How to start with Optimistic Etherscan
- Reading the explorer is free and needs no login.
- To query OP data through the API, create an Etherscan account, add a key in the API dashboard and subscribe to at least the Lite plan, since the free tier does not cover OP Mainnet or OP Sepolia.
- The same key then works for Ethereum, Polygon and the rest of the 60+ chains; you only change chainid in the request.
Optimistic Etherscan fees and limits
- OP Mainnet API access starts at Lite, $49 a month for 5 calls per second and 100,000 calls a day.
- Standard at $199 adds PRO endpoints at 10 calls per second and 200,000 calls a day, and the tiers run up to Pro Plus at $899 with the Address Metadata endpoint.
- Quarterly billing takes 10% off and yearly billing 15% off.
Browsing the explorer costs nothing.
Risks to know before using Optimistic Etherscan
- The explorer only reads chain data and holds no funds.
- Etherscan's terms, updated August 13, 2026, exclude liability for losses from phishing, mistyped addresses and incorrectly built transactions, and ban scraping outside search indexing and reuse of public labels or API data without consent.
- The About us link on the OP Mainnet site returned a notice that the feature is not available when we checked, so company details here come from the page footer, which reads Built by Team Etherscan.
Optimistic Etherscan alternatives
Other projects people compare with Optimistic Etherscan.
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Solana explorer focused on validators, staking and network health, with a free public API.
Open-source web explorer for Solana clusters, maintained in the Solana Foundation GitHub organization.
Solana block explorer with transaction views, wallet tracking and a free public API.
Solana block explorer with a paid Pro API for decoded transactions, labels and token data.
Where Optimistic Etherscan ranks on DappAtlas
Listed next to Optimistic Etherscan
- Blockscout Block explorer
- Tenderly Developer infrastructure
- Etherscan Block explorer
- Dune Analytics tool
Optimistic Etherscan pros and cons
- Shows L1 to L2 and L2 to L1 transactions
- Same interface and labels as Etherscan
- One Etherscan API key covers OP Mainnet and other chains
- OP Mainnet API access is not on the free tier; it starts at $49/month
- API Pro endpoints start at the $199/month Standard plan
Optimistic Etherscan FAQ
What is Optimistic Etherscan?
Optimistic Etherscan is the Etherscan team's block explorer for OP Mainnet. It lists L1 to L2 and L2 to L1 transactions next to regular blocks and contracts. Its API is Etherscan API V2, where OP Mainnet is a paid-tier chain: API access starts at the $49 a month Lite plan.
Which chains does Optimistic Etherscan support?
OP Mainnet.
How much does Optimistic Etherscan cost?
Lite $49/mo, Standard $199/mo, Advanced $299/mo, Professional $399/mo, Pro Plus $899/mo, according to Optimistic Etherscan’s own page (checked Sep 26, 2026).
Is Optimistic Etherscan available in the US?
Available: terms name no country restrictions, according to Optimistic Etherscan’s own page (checked Sep 26, 2026).
Sources
How this page works
Sources: Optimistic Etherscan: official site, Optimistic Etherscan: Homepage, Etherscan: API pricing. Data as of Sep 26, 2026.
Not affiliated with any project listed. Educational content, not financial advice.