How to Bridge from Ethereum Mainnet to Optimism
Celer cBridge makes it quick, easy, and secure to bridge assets like USDT, USDC, and more from Ethereum Mainnet to Optimism and from Optimism to Ethereum Mainnet by following these simple steps:
Step 1:
Connect your wallet by clicking on the “Connect Wallet” button above in order to begin your cross-chain transfer.
Step 2:
Select “Ethereum Mainnet” in the “From” dropdown menu, select “Optimism” in the “To” dropdown menu, and then select the asset type you wish to bridge to Optimism.
Please Note: You will have to switch your wallet’s network to Ethereum Mainnet in order to perform the cross-chain bridging of your selected token from Ethereum to Optimism.
Step 3:
Input the amount of the token you selected that you would like to transfer from Ethereum to Optimism in the “Send:” field. The estimated amount of that asset that is to be bridged to Optimism will be displayed in the “Receive (estimated)” field.
Step 4:
Review all of the Optimism bridge transfer information and cost estimates. If all of the cross-chain bridging transaction information is correct and acceptable, click the “Transfer” button and approve the transaction prompts to begin the cross-chain transfer.
Step 5:
Wait for your cross-chain bridge transaction to Optimism to complete. You will then receive your bridged tokens on Optimism.
Please Note: Most cross-chain transfers are completed almost instantaneously, however some may take as long as 20 minutes to complete depending on how much traffic the chain is experiencing.
If you wish to see more details about the bridge transaction from Ethereum to Optimism, you can click the links in your “Transfer History” tab.
For a more in-depth step-by-step guide on cross-chain transfers and crypto bridging see our full tutorial here:
https://cbridge-docs.celer.network/tutorial/cross-chain-transfer
Ethereum Mainnet Information
Ethereum is a decentralized blockchain platform that provides open access to digital money and data-friendly services. It is a community-built technology that is responsible for Ether (ETH) also referred to as Ethereum, as well as many different decentralized applications (dApps) that many people use today. With their tools and unique programming language, Solidity, Ethereum’s users can create, publish, monetize, and use applications on the platform, while using its Ether (ETH) cryptocurrency as payment. Ethereum allows you to move money, or make agreements, directly with someone else while serving as a decentralized public ledger for verifying and recording those transactions.
Ether / Ethereum (ETH) Current Information
Description
Ether (ETH), also referred to as Ethereum, is the main decentralized cryptocurrency used when dealing with Ethereum Mainnet and its various layer-2s like Arbitrum and Optimism. Simply put, it is the currency of when interacting with Ethereum Mainnet or its layer-2s. Whether you want to simply transfer some ETH between wallets, use ETH as collateral for creating an entirely new token, receive some bridged tokens from another chain like Polygon, or use an application someone had built on Ethereum; anytime you interact with Ethereum you will be required to pay a small fee in ETH.
Our cross-chain bridge, cBridge, supports the cross-chain bridging of Ether (ETH) 
between multiple chains with the fastest speeds, lowest costs, and most secure transactions available. The full name of this asset is Ether and the ticker of this asset is ETH.
Optimism Information
Optimism is a popular layer 2 scaling solution for Ethereum similar to Arbitrum that can support all of Ethereum’s dApps. To enable efficient scaling, instead of running all computation on the Ethereum Mainnet, Optimism puts all transaction data on-chain but runs computation off-chain. This effectively increases Ethereum’s transactions per second and decreases transaction fees. ETH or Ether is the standard currency used to pay for transactions on Optimism where you can use ETH to pay for transactions on L1, and you use it to pay for transactions on Optimism, L2. Optimism also has its governance token Optimism with the ticker symbol OP.
When making asset withdrawals from Optimism to Ethereum Mainnet, cBridge offers the finality within 5~20 minutes and delivers this at 50% less gas fees than the native bridge.
Ether /Ethereum (ETH) Current Information
Description
Ether (ETH), also referred to as Ethereum, is the main decentralized cryptocurrency used when dealing with Ethereum Mainnet and its various layer-2s like Arbitrum and Optimism. Simply put, it is the currency of when interacting with Ethereum Mainnet or its layer-2s. Whether you want to simply transfer some ETH between wallets, use ETH as collateral for creating an entirely new token, receive some bridged tokens from another chain like Polygon, or use an application someone had built on Ethereum; anytime you interact with Ethereum you will be required to pay a small fee in ETH.
Our cross-chain bridge, cBridge, supports the cross-chain bridging of Ether (ETH) between multiple chains with the fastest speeds, lowest costs, and most secure transactions available. The full name of this asset is Ether and the ticker of this asset is ETH.
What is a Blockchain/Crypto Bridge?
Blockchain or Crypto bridges work just like the real thing, but instead of connecting physical places together, they are used to connect digital ecosystems together. These bridges can pass both information and assets between the bridged blockchains. We call this a cross-chain transfer.
As an example, if you have a need to use USDT on Optimism, and you have USDT on Ethereum Mainnet and not on Optimism, you could either deposit more USDT specifically on Optimism, or you could find an Optimism bridge that will bridge your USDT from Ethereum Mainnet to Optimism so you do not have to spend more to get additional USDT just because it is on Optimism.
There are also different types of bridging in terms of how the cross-chain transfer is done from a technical standpoint. There is liquidity-based bridging where there are liquidity pools of an asset on both the source and destination blockchains. There is also canonical-based bridging where an asset is locked on the source chain and a new asset that represents that locked asset is created on the destination chain.
Bridging and cross-chain transfers are not limited to just normal assets or fungible tokens either. Bridges can transfer and move non-fungible tokens (NFTs) between chains as well. cBridge supports 2 main models when it comes to NFT bridging, pegged NFT bridging and multi-chain native (MCN) NFT bridging. Pegged NFT bridging is similar to the canonical-based bridging mentioned above. The NFT is locked on the source chain and a new NFT that represents that locked NFT is created, or minted, on the destination chain. In the MCN NFT bridging model, however, a MCN NFT does not have the notion of “origin chain” or "original NFT". When transferring an MCN NFT from chain A to chain B, the only pattern is "Burn-and-Mint" so that there is always only one NFT across all of the chains.
Then there are the different levels of “trust” you can have in a crypto bridge. The two main types are trusted and trustless bridges. Trusted bridges depend on a central system or entity and require you to put your trust in them if you wish to use their bridge. Trustless bridges, like our own cBridge, are completely controlled by and run on automated smart contracts and algorithms that have the same security and stability as the blockchain itself.
Things start to get a more complex from there so if you are interested in learning more about the different types of bridges and the tech behind them, you can read through our documents here: https://cbridge-docs.celer.network/
What are the Benefits of Using a Blockchain/Crypto Bridge?
There are many reasons you may want to use a bridge to do a cross-chain transfer between different blockchains:
Lower transaction fees
You can take advantage of platforms with lower transaction fees and higher speeds when compared to more congested chains, like Ethereum Mainnet. Especially when exploring different decentralized applications (dApps). You can look at alternative chains, like BNB Chain, and bridge your USDC, or whatever other asset you wish to bridge, from Ethereum to BNB Chain. You can then get some of that chain’s utility token and will be able to enjoy the lower transaction fees and higher speeds afforded to chains like BNB Chain.
Take advantage of other dapps and opportunities on different blockchains
If you’ve been providing liquidity for lending out USDC on Ethereum Mainnet, but see that the interest rate for lending USDC on Optimism is significantly higher; you can use a cross-chain transfer to move your USDC from Ethereum Mainnet to Optimism in order to take advantage of that higher interest rate.
Explore other blockchain ecosystems
The Web3 world is growing fast and you now have more options than ever before when it comes to different blockchains and dApps on those chains. There are many different compelling reasons why developers are building on the chains they are and with all of this diversity it makes it difficult to select a chain to invest in. Bridges and cross-chain transfers help solve this issue. By giving you the ability to bridge assets like ETH, USDT, USDC, and BTC to different chains, this opens up your options when it comes to being able to explore alternate L1 chains and the native dapps and services that they provide.
Popular Bridges
Ethereum to Avalanche Bridge Ethereum to Polygon Bridge Ethereum to Arbitrum Bridge Ethereum to Optimism Bridge Ethereum to Fantom Bridge Ethereum to Aptos Bridge Ethereum to Flow Bridge Astar to Ethereum Bridge Klaytn to Ethereum Bridge Evmos to Ethereum Bridge
Arbitrum to Polygon Bridge Binance to Ethereum Bridge Binance to Polygon Bridge Binance to Avalanche Bridge Avalanche to Polygon Bridge Avalanche to Fantom Bridge Nervos Godwoken to Ethereum Bridge Kava to Ethereum Bridge Moonbeam to Ethereum Bridge
Bridge ETH from Ethereum to Polygon Bridge USDT from Ethereum to Avalanche
Bridge USDC from Avalanche to Ethereum
