An Ethereum Layer 2 optimistic rollup, OP Mainnet offers EVM equivalence and low-cost transactions, secured by Ethereum and powering the OP Stack Superchain.
OP (Optimism Mainnet) is an Ethereum Layer 2 optimistic rollup that provides low-cost, EVM-equivalent execution while inheriting Ethereum security; gas is paid in ETH. Typical fees are ~$0.01–$0.10 per transaction with ~2s block times and near-instant L2 confirmations, making it well-suited for DeFi, NFT minting/marketplaces, gaming, onchain social, and high-frequency payments.
OP stands out with the OP Stack and Superchain architecture that powers multiple L2s (e.g., Base, World Chain, Zora, Mode) with shared standards, upgrades, and interoperability, plus governance by the Optimism Collective and Retro Funding for public goods; withdrawals to L1 use a ~7‑day challenge window with fault proofs live. Performance highlights for comparison: ~2s blocks, sustained throughput in the tens of TPS with bursts into the hundreds, and hundreds of thousands to 1M+ daily transactions; average gas fees are often under $0.05, paid in ETH. Developers get near 1:1 EVM parity (Bedrock) for seamless contract migration and tooling compatibility.
OP 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 OP, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select OP as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on OP 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 OP 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 OP, ensure your wallet is connected to the OP network, enter the recipient's address, specify the amount of ETH to send, review the gas fee, and confirm the transaction in your wallet.
