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Block explorers

Block explorers

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.

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This page includes providers that meet specific inclusion criteria, as outlined below. Please visit the community block explorers page (opens in a new tab) for an additional listing of third-party block explorers.

Blockscout

We have a Blockscout explorer for OP Mainnet (opens in a new tab) and OP Sepolia (opens in a new tab). It includes:

Blockscout also has some OP-Mainnet-specific features:

Etherscan

We have Etherscan explorers for the OP Mainnet (opens in a new tab) and the OP Sepolia (opens in a new tab). 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:

Superscan by Routescan

Superscan (opens in a new tab) is the dev-focused Superchain explorer unified at the ecosystem level, powered by Routescan (opens in a new tab). 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

Once Upon

If you're building on multiple chains, Once Upon's Superchain block explorer (opens in a new tab) 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

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 (opens in a new tab). 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.

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, homegrown TG or 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 (opens in a new tab). You can also promote your tool in the developer forum (opens in a new tab) and signup to share your tool at the next demo day (opens in a new tab).

Next Steps