A developer-focused Ethereum Layer 2 testnet on the OP Stack (chain ID 84532), Base Sepolia mirrors mainnet for low-cost, high-throughput EVM testing with Sepolia ETH.
Base Sepolia is the Ethereum Sepolia-based test network for Base (an OP Stack L2 using ETH), providing a production-parity environment to safely test dapps, smart contracts, wallets, and cross-chain bridge flows before mainnet. Developers use it with faucet ETH and identical EVM tooling to validate deployments and performance. Typical metrics mirror Base L2: ~2-second block times, negligible testnet fees (gas often ~0.01–0.5 gwei), double‑digit sustained TPS with higher bursts, and frequent spikes to tens of thousands of daily transactions—check the explorer for live stats.
Base Sepolia stands out for OP Stack EVM-equivalence with EIP‑4844 blob data enabled, delivering fast blocks and extremely low costs while tracking Base mainnet releases for true production parity. It is integrated into the Optimism Superchain for standardized cross‑L2 interoperability, offers a canonical bridge to Ethereum Sepolia, and benefits from Coinbase-backed infrastructure, faucets, and explorers. In practice, you get seconds‑level finality, near‑zero testnet gas, and throughput in the tens to hundreds of TPS (load-dependent), making it significantly faster and cheaper than L1 testnets for iterative development.
Base Sepolia Testnet uses ETH as the gas token for transaction fees. You can obtain ETH by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge ETH to Base Sepolia Testnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Base Sepolia Testnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Base Sepolia Testnet you can use thirdweb, which provides an easy way to build, monetize and scale your apps, games or agents. You can find detailed guides and documentation on https://portal.thirdweb.com to get started quickly.
To add Base Sepolia Testnet to your wallet, you can connect your wallet and click on [Add to Wallet] button at the top of the page. Alternatively, you can add the network manually using the RPC URL and chain details and add it to your wallet's network settings.
To send ETH on Base Sepolia Testnet, ensure your wallet is connected to the Base Sepolia Testnet network, enter the recipient's address, specify the amount of ETH to send, review the gas fee, and confirm the transaction in your wallet.