Base is Coinbase's OP Stack rollup, launched on mainnet in August 2023 and settling to Ethereum. Picking a block explorer for Base depends on what you actually need: a polished UI for end users, a public API for indexers, a multi-chain view across the Superchain, or open-source self-hosting. This guide compares the four explorers most teams use on Base and where each one wins.
Which Base block explorer should you use?
Most users default to Basescan because it mirrors the Etherscan interface they already know and serves as the explorer linked from Coinbase Wallet and the Base docs. Developers who want open-source code, richer token analytics, or a self-hostable instance pick Blockscout. Teams indexing multiple OP Stack chains often add Routescan alongside.
Comparison table
Explorer | Free tier | Paid pricing | API features | Contract verification | Unique strength |
Basescan | 3 calls/sec, 100k calls/day | Lite $49/mo, Standard $199/mo, Advanced $299/mo, Professional $399/mo, Pro Plus $899/mo (Etherscan tiers) | Etherscan-compatible v1 and v2 endpoints, multi-chain via single key | Solidity single-file, multi-file, standard JSON, Vyper, Sourcify | Default explorer linked from Coinbase Wallet and Base docs |
Blockscout (Base) | Public RPC and API, no key required for basic use | Self-host is free; Blockscout Cloud has paid plans for hosted instances | REST v2, GraphQL, Etherscan-compatible legacy endpoints, WebSocket | Solidity, Vyper, Sourcify, multi-part, standard JSON | Open source (GPLv3), self-hostable, native token transfer indexing |
Routescan (Base) | Public endpoints; rate limits documented per chain | Custom for indexer and enterprise tiers | Etherscan-compatible API, unified across 160+ EVM chains | Solidity, standard JSON, Sourcify-compatible | Single API key spans Base, Avalanche, all subnets, and other EVM L2s |
OnchainKit explorer integrations | Free for OnchainKit users | Bundled with Base / Coinbase Developer Platform usage | SDK helpers that link addresses, txs, blocks to a chosen underlying explorer | N/A (delegates to Basescan or Blockscout) | Drop-in React components for Base apps; no infra to run |
Pricing reflects published tiers from Etherscan's API plan page and Blockscout's documentation as of May 2026. Always confirm the live pricing page before committing.
Basescan: the default Etherscan-built explorer
Basescan is operated by the Etherscan team and serves as the canonical explorer for Base. It launched alongside Base mainnet in August 2023 and uses the same UI patterns as Etherscan, BscScan, and Arbiscan, which makes onboarding trivial for anyone who has used an Etherscan-family explorer before.
Contract verification supports Solidity single-file, multi-file, standard JSON input, Vyper, and Sourcify imports.
The API is Etherscan-compatible, so libraries written for Etherscan generally work by swapping the base URL.
Etherscan's v2 multi-chain API lets a single API key query Base, Ethereum, and other Etherscan-family chains via a
chainidparameter.Free tier is 3 calls/sec and 100,000 calls/day; Lite at $49/mo bumps to 5 calls/sec. Higher paid tiers raise rate limits further and unlock Pro endpoints.
Basescan is also where Coinbase Wallet's transaction links resolve by default, so end users who tap "View on explorer" from Coinbase Wallet land on Basescan. For consumer apps targeting Base, this is the path of least friction.
Blockscout on Base: open source and self-hostable
Blockscout is the open-source explorer maintained by the Blockscout team and used as the default explorer on dozens of EVM chains. The Base instance lives at base.blockscout.com and is also surfaced inside the Base ecosystem pages. Blockscout's source is published under GPLv3, so teams can self-host a Base explorer for compliance, latency, or branding reasons.
REST v2 API, GraphQL, WebSocket, and an Etherscan-compatible legacy endpoint.
Native token transfer indexing for ERC-20, ERC-721, and ERC-1155 with first-class endpoints.
Contract verification via Solidity, Vyper, multi-part, standard JSON, and Sourcify.
Built-in support for OP Stack-specific data: L1-to-L2 deposits, L2-to-L1 withdrawals, and the standard OP bridge contracts.
Blockscout is the right pick when you need open-source code, GraphQL, or the option to run your own instance against a private Base archive node.
Routescan: multi-chain coverage from one API
Routescan operates explorers across 160+ EVM chains, including Base, Avalanche C-Chain, Avalanche subnets, and several OP Stack rollups. The Base instance offers an Etherscan-compatible API, so existing tooling works with minimal changes. The main reason teams pick Routescan is when they index Base alongside other EVM chains and want a single API key and consistent schema across all of them.
Routescan publishes per-chain rate limits in its API documentation and offers paid tiers for indexer and enterprise workloads. For a Base-only deployment, Basescan or Blockscout will usually be a better fit; for portfolio dashboards or aggregators, Routescan reduces integration work.
OnchainKit and Coinbase Developer Platform integrations
OnchainKit is Coinbase's React component library for Base apps. It does not run its own explorer; instead, it ships utilities and components that link transaction hashes, addresses, and blocks to whichever explorer you configure (Basescan by default). This is useful for Base consumer apps that want clean "view on explorer" links without writing URL builders.
Coinbase Developer Platform similarly leans on Basescan for transaction links from its Smart Wallet and Paymaster surfaces. If you are already on CDP and OnchainKit, you are effectively using Basescan whether you specify it or not.
Base-specific features to look for
Base is an OP Stack chain, which means a good Base explorer surfaces L2-specific data the same way Etherscan surfaces Ethereum-specific data. Four areas matter most.
L2 fee breakdown. Base transactions pay an L2 execution fee plus an L1 data fee for posting to Ethereum. Both Basescan and Blockscout itemize these on the transaction detail view.
Sequencer view. Base currently runs a single sequencer operated by Coinbase. Explorers should label sequencer-submitted batches and show the L1 batch transaction on Ethereum.
Cross-chain message tracking. Deposits from Ethereum and withdrawals back to Ethereum go through standard OP Stack bridge contracts. A Base explorer should link the L1 and L2 sides of the same message.
Coinbase Wallet integration. Coinbase Wallet's "view on explorer" button opens Basescan by default. This matters for support tickets where you want a customer's link to match what your team sees.
Basescan vs Blockscout-on-Base API: which fits a multi-chain dashboard?
For a dashboard indexing Base alongside other EVM chains, the right API depends on whether you want one unified surface or rollup-native depth. Basescan's API uses the Etherscan v2 unified key, so the same key reads Base, Ethereum, Arbitrum, and Optimism. Blockscout on Base exposes a REST + GraphQL surface with deeper rollup metadata.
One key vs per-chain keys. Etherscan v2 lets you call Basescan, Etherscan, Arbiscan, and Optimistic Etherscan with one API key by passing a chainid parameter. Blockscout instances are per-chain and do not federate keys; a multi-chain dashboard hits a different host per network.
GraphQL availability. Blockscout ships a GraphQL endpoint alongside REST. Etherscan-built explorers stay REST-only on the public v2 surface.
Rollup-native fields. Blockscout surfaces L1 batch numbers, sequencer batches, and OP Stack withdrawal status directly. Basescan exposes the same data, but some fields require following links into the transaction detail view rather than reading them off a single API call.
Free-tier rate limits. Both providers publish free tiers in their docs; verify current limits before committing a production integration.
Practical pattern: most multi-chain dashboards use Etherscan v2 as the default and fall back to Blockscout when they need rollup-native depth (sequencer status, batch indexing, withdrawal proofs).
What Base-specific data should an explorer surface?
Base inherits OP Stack semantics, so a Base explorer needs more than generic EVM views. Per the Base docs, the must-have signals are sequencer status, L1↔L2 bridge events, and Coinbase Wallet deep-link parity. Each affects developer support workflows in production.
Sequencer status. Base runs a single sequencer operated by Coinbase. When the sequencer pauses, mempool views go stale. A Base-aware explorer should label sequencer-submitted batches and show the L1 batch transaction on Ethereum so on-call teams can confirm liveness without leaving the explorer.
L1↔L2 bridge events. Deposits and withdrawals route through the OP Stack bridge contracts. Linking the L1 deposit transaction to the L2 mint (and vice versa for the withdrawal challenge window) cuts support time on bridge tickets. Both Basescan and Blockscout-on-Base expose these.
Coinbase Wallet deep links. Coinbase Wallet's "view on explorer" defaults to Basescan. If your team sees Blockscout while customers send Basescan links, hashes still match but UI differences cause confusion. Pick one canonical explorer for support docs and stick with it.
How we picked
We chose explorers actively used by Base developers in production: explorers documented in the Base docs, linked from Coinbase Wallet, or maintained by the OP Stack ecosystem. We excluded archive-only explorers and explorers that only mirror data from another source. Pricing and feature data come from each provider's official documentation.
Sources
Etherscan API documentation and Basescan endpoints (docs.etherscan.io)
Blockscout documentation, base.blockscout.com (docs.blockscout.com)
Routescan developer documentation (routescan.io)
Base docs and ecosystem pages (docs.base.org)
OnchainKit documentation (onchainkit.xyz)