Block Explorer for Base Sepolia Testnet
Ethernal is a hosted block explorer for Base Sepolia, the official testnet for Base (Coinbase's OP Stack L2). Get transaction decoding, contract verification, OP Stack bridge monitoring, and a built-in faucet for your Base Sepolia development environment.
Chain ID 84532OP Stack Bridge Monitoring on Testnet
Base Sepolia (chain ID 84532) runs the same OP Stack architecture as Base mainnet. Ethernal monitors your testnet OptimismPortal contract, tracks deposits from Sepolia L1, and follows withdrawals through the challenge period. Test your bridge integration in a staging environment before going to mainnet.
Request testnet ETH for development
Built-in Testnet Faucet
The Ethernal Starter plan (free) includes a built-in testnet faucet. Visitors can request test ETH directly from your Base Sepolia explorer page. No need to set up a separate faucet service or deal with third-party rate limits.
Explorer Features
How to Set Up a Base Sepolia Block Explorer
Create a workspace
Sign up at app.tryethernal.com and create a new workspace.
Connect Base Sepolia RPC
Paste the Base Sepolia RPC endpoint: https://sepolia.base.org or use a provider like Alchemy or QuickNode.
Configure OP Stack bridge (optional)
Enter the testnet OptimismPortal address to enable deposit and withdrawal tracking. This uses the same configuration as Base mainnet but with Sepolia L1 as the parent chain.
Start exploring
Your Base Sepolia explorer is live. Blocks, transactions, and contracts are indexed automatically. Use the built-in faucet and verify contracts.
Pricing for Base Sepolia Explorers
The Starter plan (free) is often all you need for a Base Sepolia testnet explorer. It includes contract verification, token tracking, a built-in faucet, and unlimited transactions. For custom domains and branding, the Team plan starts at $150/month. Full whitelabel is $500/month on the App Chain plan.
View Full PricingFrequently Asked Questions
How do I set up a block explorer for Base Sepolia?
Create a free workspace on Ethernal, paste the Base Sepolia RPC endpoint (https://sepolia.base.org), and optionally configure OP Stack bridge addresses. Your explorer is live in minutes.
What is the chain ID for Base Sepolia?
Base Sepolia uses chain ID 84532. It settles on the Sepolia testnet (chain ID 11155111) and runs the same OP Stack architecture as Base mainnet (chain ID 8453).
Does Ethernal support OP Stack bridge features on Base Sepolia?
Yes. Configure your testnet OptimismPortal address and Ethernal will track deposits, withdrawals, and the full withdrawal lifecycle (initiation, state proposal, challenge period, proving, finalization) on Base Sepolia.
Can I get free Base Sepolia ETH through Ethernal?
Yes. The Ethernal Starter plan includes a built-in testnet faucet. Users can request test ETH directly from your explorer page without a separate faucet.
Can I use the same Ethernal setup for Base mainnet?
Yes. The configuration is identical. When you are ready to go to production, update your RPC URL from Base Sepolia to Base mainnet and swap the bridge contract addresses. Everything else carries over.
Ready to launch your explorer?
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