An EVM-equivalent Ethereum PoS testnet, Sepolia offers predictable performance via a permissioned validator set, wide tooling support, chain ID 11155111, and faucet-based test ETH.
Sepolia is Ethereum’s primary public Proof‑of‑Stake testnet (chain ID 11155111) for safe dApp, smart contract, wallet, and infrastructure testing using test ETH. It mirrors mainnet parameters for realistic performance: ~12s block time, typical base fee ~0.5–3 gwei, practical throughput ~10–15 TPS, and developer‑focused activity that’s far below mainnet traffic. This stable, permissioned‑validator environment is ideal for validating deployments and bridge flows without real‑value risk.
Sepolia uniquely combines mainnet‑aligned upgrades and PoS consensus with a permissioned validator set, reducing spam and providing predictable performance for testing. Compared with other networks and testnets (e.g., Holesky/Goerli), it targets application testing with faucet‑limited test ETH, consistently low gas costs (<5 gwei), ~12s blocks, and mainnet‑parity tooling support (e.g., Otterscan and major RPC providers). The result is a deterministic, low‑noise EVM environment optimized for pre‑mainnet QA and cross‑chain bridge integrations.
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 Sepolia, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Sepolia as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on 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 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 Sepolia, ensure your wallet is connected to the 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.
