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This reference guide lists different block explorers you can use to interact with contract source code and view transaction history for OP Mainnet and OP Sepolia.
This page includes providers that meet specific inclusion criteria, as outlined below. Please visit the community block explorers page for an additional listing of third-party block explorers.

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Blockscout

We have a Blockscout explorer for OP Mainnet and OP Sepolia. It includes: Blockscout also has some OP-Mainnet-specific features:

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Etherscan

We have Etherscan explorers for the OP Mainnet and the OP Sepolia. Etherscan has lots of tools to help you debug transactions. Optimistic Etherscan has all the tools you expect from Etherscan, such as: It’s also got some OP-Mainnet-specific features:

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Superscan by Routescan

Superscan is the dev-focused Superchain explorer unified at the ecosystem level, powered by Routescan. On the Superscan, developers can quickly glance at transactions, blocks, addresses, deployed contracts and more across the Superchain in unified pages. The Superscan currently includes:
  • Mainnet - OP Mainnet, Base, Zora, Mode, Cyber, Orderly, Fraxtal, Public Goods Network
  • Testnet - Zora, Mode, Orderly, Fraxtal

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Once Upon

If you’re building on multiple chains, Once Upon’s Superchain block explorer consolidates transaction data across all OP Chains, offering developers a unified view of all Superchain activity, including testnets. Once Upon currently supports:
  • Mainnet - Ethereum, OP Mainnet, Base, Zora, Public Goods Network
  • Sepolia - Ethereum, OP Sepolia, Base, Zora, Public Goods Network, Lyra, Mode

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Tenderly

Tenderly’s Developer Explorer for OP Mainnet and Op Sepolia allows you to monitor and inspect transactions, providing high level of details and additional tools: Tenderly Developer Explorer lets you:
  • Keep track of specific contracts and their transactions
  • Inspect transaction execution with fully decoded transaction trace
  • Debug failing and simulate correct transactions before sending them on-chain
  • Evaluate function-level gas usage for any transaction
  • Set up Alerts to monitor interactions, access control, asset transfers, and contracts’ state changes
  • Create a Virtual TestNet from a specific OP Mainnet or OP Chain transaction for systematic research

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Access to pre-regenesis history

Because of our final regenesis on 11 November 2021, older transactions are not part of the current blockchain and do not appear on Etherscan. However, you can access transaction history between 23 June 2021 and the final regenesis using a number of different tools. For detailed instructions, see Regenesis History.

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Inclusion criteria

Developer teams who want to feature products/tools on this page must meet the following criteria:
  1. ongoing partnership with Optimism whether formal agreement, RPGF, RFP, collaborated on specific initiatives, etc.;
  2. established user base and OP ecosystem engagement such as governance participation, Community Discord or Superchain Developer Discord participation, etc.; and
  3. actively maintained developer tool that aligns with OP’s commitment to a magical developer experience (e.g., easy-to-use, easy-to-integrate, great DevX, highly-rated by community, etc.)
For teams that are supporting but still establishing a user base, we encourage you to share your tool on the community block explorers page. You can also promote your tool in the developer forum and signup to share your tool at the next demo day.

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Next Steps

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