A zkEVM Layer 2 testnet on Ethereum (Chain ID 300), zkSync Sepolia delivers low-cost, fast transactions secured by zero-knowledge proofs and native account abstraction.
zkSync Sepolia Testnet is the public zkSync Era zk‑rollup network running on Ethereum’s Sepolia, mirroring mainnet features (validity proofs, EVM‑equivalent tooling, native account abstraction) while using test ETH. It’s used for end‑to‑end testing of dApps, smart contracts, wallets, paymasters, and bridge flows, including gas profiling with EIP‑4844. Typical performance mirrors mainnet characteristics: ~3–5s L2 block times, bursts of 20–100+ TPS, and sub‑cent equivalent fees for simple transfers (denominated in Sepolia ETH).
It’s unique in pairing zero‑knowledge validity proofs (Ethereum‑anchored security and minute‑scale withdrawal finality) with native account abstraction and EIP‑4844 data blobs. Compared with many L1s and optimistic rollups, it delivers sub‑5s blocks, bursts of 20–100+ TPS, and sub‑cent transfer costs, enabling realistic UX and bridge testing without economic risk. It also mirrors zkSync’s native bridge and developer tooling, so teams can validate cross‑chain flows, paymasters, and smart‑account features before mainnet deployment.
zkSync 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 zkSync Sepolia Testnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select zkSync Sepolia Testnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on zkSync 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 zkSync 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 zkSync Sepolia Testnet, ensure your wallet is connected to the zkSync 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.