A high-performance Layer 1 testnet for Sei (chain ID 1328) offering EVM compatibility and sub-second finality for low-cost, trading-focused DeFi applications.
Sei Testnet is the public pre‑production network for the Sei Layer‑1 (SEI), used to deploy, benchmark, and audit high‑throughput dApps (EVM‑compatible and CosmWasm) before mainnet release. It targets latency‑sensitive use cases like orderbook DEXs, market‑making, payments, and cross‑chain IBC/bridge integrations. Typical testnet metrics: sub‑second block times (~0.5s), high throughput (1k+ TPS under load), faucet‑funded fees effectively <$0.001 per tx (≈0.00005–0.001 SEI), and public runs that drive 10k–100k+ daily transactions.
Sei pairs a Cosmos SDK/IBC foundation with a parallelized, low‑variance execution layer (Sei v2 EVM), enabling near‑instant finality and MEV‑aware features to reduce frontrunning—capabilities tailored for exchange‑grade apps. Compared with many testnets (~1–2s blocks, ~100–1,000 TPS, ~$0.001–$0.01 fees), Sei targets ~0.5s blocks, 1k+ TPS with higher peaks in benchmarks, and average fees ≈0.00005–0.001 SEI (<$0.001), while sustaining high activity during public stress phases and offering native IBC interoperability for seamless cross‑chain apps.
Sei Testnet uses SEI as the gas token for transaction fees. You can obtain SEI by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge SEI to Sei Testnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Sei Testnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Sei 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 Sei 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 SEI on Sei Testnet, ensure your wallet is connected to the Sei Testnet network, enter the recipient's address, specify the amount of SEI to send, review the gas fee, and confirm the transaction in your wallet.