An EVM-compatible blockchain on Sepolia for Connext, delivering fast, low-cost cross-chain bridging and messaging with ETH gas and trust-minimized interoperability.
Connext Sepolia is Connext’s deployment on Ethereum Sepolia that enables cross-chain messaging and token bridging via xcall, using ETH as the native gas. It is used for production-like staging of multi-chain dApps, liquidity rebalancing, and low-cost end-to-end bridge/swap flows that mirror mainnet behavior. Performance snapshot (Sep 2025): ~12s blocks, 1–5 gwei gas, ~1–10 TPS with developer-heavy activity; a typical xcall transfer costs ~150k–400k gas.
It pairs Ethereum-equivalent execution and finality (chainId 11155111) with native Connext router integration, so developers can test and ship xcall-based cross-chain flows that behave like mainnet at a fraction of the cost. Versus Ethereum mainnet it’s far cheaper (1–5 gwei vs tens of gwei) at similar ~12s blocks, and versus L2s it trades peak TPS for higher compatibility and deterministic, mainnet-like semantics—ideal for benchmarking Connext routes and liquidity operations.
Connext Sepolia uses ETH as the gas token for transaction fees. You can obtain ETH by bridging from other chains or purchasing using thirdweb Bridge.
To bridge ETH to Connext Sepolia, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Connext Sepolia as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Connext 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 Connext 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 Connext Sepolia, ensure your wallet is connected to the Connext 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.