An ETH-native mainnet blockchain, Codex emphasizes easy Ethereum ecosystem integration and developer familiarity, with Chain ID 81224 enabling precise configuration across wallets and tooling.
Codex is an EVM-compatible, Ethereum-based Layer 2 mainnet that uses ETH as the native gas token to deliver low-fee, fast-finality transactions for DeFi, payments, NFTs, gaming, and cross-chain messaging. Core use cases include bridging assets from Ethereum, executing high-throughput swaps and payments, and settling dApp activity with Ethereum tooling compatibility. Versus Ethereum L1 (~12s blocks, ~15 TPS, fees often >$1), Codex targets sub-5s block times, >100 TPS, and median fees in the cents range for predictable, affordable user operations.
Codex is unique for combining native-ETH gas with full EVM compatibility, enabling seamless wallet/tooling support and direct, trust-minimized settlement anchored to Ethereum. Its design emphasizes fast confirmations and economical gas, delivering 10–100x lower costs and a faster block cadence than L1 while sustaining higher throughput for bursty cross-chain flows. For bridge users, this yields quicker finality on transfers and swaps, predictable low fees, and improved execution quality from higher TPS relative to Ethereum mainnet.
Codex 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 Codex, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Codex as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Codex 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 Codex 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 Codex, ensure your wallet is connected to the Codex network, enter the recipient's address, specify the amount of ETH to send, review the gas fee, and confirm the transaction in your wallet.