Sei Devnet is a public developer environment that mirrors Sei mainnet’s high-performance L1 (Cosmos SDK plus a parallelized EVM) for deploying and testing Solidity and CosmWasm dApps, bridges, and cross-chain flows before production. It delivers sub-second finality (~0.3-0.6s block times), near-zero fees (typically <0.001 SEI for simple transfers), and benchmark throughput in the 10k-20k+ TPS range, making it ideal for stress-testing orderbook DEXs, perps, and latency-sensitive games. Devnet also exposes IBC channels and EVM RPCs so teams can validate interoperability, indexing, and wallet integrations.
Sei Devnet is unique for its optimistic parallelized EVM that runs independent transactions concurrently while preserving determinism, combined with native IBC for seamless Cosmos interoperability—capabilities most EVM-first chains lack. In practice this yields faster blocks and lower fees than many L1s (about 0.5s blocks and sub-cent costs vs Ethereum’s ~12s blocks and higher fees) and higher headroom for bursty workloads compared with typical Cosmos chains. Developers get dual-stack support (Solidity and CosmWasm), production-grade RPCs and indexers, and a validator topology that closely mirrors mainnet performance for accurate pre-launch testing.
Sei Devnet uses SEI as the gas token for transaction fees. You can obtain SEI by bridging from other chains or purchasing using thirdweb Bridge.
To bridge SEI to Sei Devnet, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Sei Devnet as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Sei Devnet 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 Devnet 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 Devnet, ensure your wallet is connected to the Sei Devnet network, enter the recipient's address, specify the amount of SEI to send, review the gas fee, and confirm the transaction in your wallet.