Arbitrum Sepolia is Arbitrum’s Ethereum Layer 2 testnet that mirrors the Nitro stack used on Arbitrum One, with ETH as the native gas and settlement on Ethereum Sepolia. It’s designed for end-to-end dApp, bridge, and L1↔L2 messaging tests under production parity (including the optimistic challenge window). For comparison, expect sub‑second confirmations (~0.3–0.5 s blocks), negligible test‑ETH fees, sustained tens of TPS with higher burst capacity, and lower overall activity than mainnet for stable staging.
Unlike generic L1 testnets, Arbitrum Sepolia provides EVM‑equivalent execution on the Nitro optimistic rollup with the same gas model, tooling, and canonical bridges as Arbitrum One, so deployments migrate with minimal changes. It delivers fast blocks (~0.3–0.5 s) and very low fees relative to L1 Sepolia while inheriting Ethereum‑backed data availability and security. This production‑parity design and routine tens‑of‑TPS performance, combined with active ecosystem tooling (explorers, RPCs, faucets), make it a high‑fidelity test environment compared to other networks.
Arbitrum Sepolia 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 Arbitrum Sepolia, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Arbitrum Sepolia as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Arbitrum Sepolia 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 Arbitrum Sepolia 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 Arbitrum Sepolia, ensure your wallet is connected to the Arbitrum Sepolia network, enter the recipient's address, specify the amount of ETH to send, review the gas fee, and confirm the transaction in your wallet.
