It’s our goal to connect people with NFTs across as many chains as possible. OpenSea currently offers cross-blockchain compatibility across the Ethereum, Polygon, Klaytn, Arbitrum, Optimism, Avalanche, Zora, Base, Blast, Sei, B3, Berachain, Flow, ApeChain, Soneium, Shape, and Unichain blockchains.

This guide briefly explains the differences between them.

Official Website: ethereum.org

Token: ETH

Ethereum is a decentralized, open-source blockchain with smart contract functionality launched in 2015.

Ether is the native currency of the Ethereum network and it’s commonly abbreviated to ETH, which is its ticker symbol. Ethereum uses a proof-of-stake (PoS) consensus mechanism, eliminating the need for energy-intensive mining and instead securing the network using staked ETH. In Ethereum, new transactions get added in "blocks" every 12 seconds. Validators are a built-in mechanism of the Ethereum blockchain and get paid in ETH.

ETH is used to pay transaction fees (known as gas fees) on the Ethereum blockchain. OpenSea has no say in setting gas fees - they are determined by network capacity and demand and fluctuate according to network usage.

Official Website: polygon.technology

Token: MATIC

Polygon is an EVM-compatible blockchain that provides scalable, secure, and quick transactions with currencies like ETH, USDC, MATIC, and DAI.

As one of the first scaling solutions for Ethereum, cryptocurrencies must be "bridged" from Ethereum's blockchain to Polygon. Think of Polygon as a sibling to Ethereum, the currencies are similar, but the two blockchains have slight differences.

Official Website: www.klaytn.foundation

Token: KLAY

Klaytn is an open-source public blockchain project, built to be the fundamental trust layer for the metaverse, respecting and empowering the participation and contribution of its community and stakeholders. Users can use the Kaikas wallet browser extension or MetaMask to buy and sell Klaytn NFTs using OpenSea. Klaytn’s native token, KLAY, is supported and used to pay for transaction fees.

Klaytn offers the following properties for builders and participants:

Official website: https://bridge.arbitrum.io/

Token: Arbi ETH

Arbitrum is a type of technology known as an “optimistic rollup,” which is a blockchain that takes advantage of the consensus mechanism of its parent chain—in this case, Ethereum.

Optimistic rollups have many advantages, including rapid and inexpensive transactions and the decentralization and security guarantees provided by Ethereum as a reliable L1 foundation.

Arbitrum was created with Ethereum compatibility as a top priority, meaning users can interact with Arbitrum using standard Ethereum wallets, and developers can build and deploy contracts with standard Ethereum libraries and tooling.

OpenSea is compatible with the Arbitrum chains Arbitrum One and Arbitrum Nova (OS1 only).

Official website: https://www.optimism.io/

Token: OP

Optimism is an EVM equivalent Optimistic Rollup chain designed to be fast, simple, and secure.

Transaction data submitted on Optimism is "rolled up" to the Ethereum mainnet in batches. These groups of transactions are bundled by a single computer, the sequencer. This significantly reduces transaction cost—typically between 1% and 10% of the cost on the Ethereum mainnet—while a challenge mechanism ensures the sequencer is honest.

Optimism is more than a blockchain. It's also an experiment in sustainable ecosystem funding fueled by protocol revenue, donating 100% of sequencer profits to projects in the ecosystem via retroactive public goods funding—scaling Ethereum’s present to provide funding for its future.

All Optimism transactions are posted to L1 Ethereum, inheriting the strong security guarantees of Ethereum.

Official website: https://www.avax.network/

Token: AVAX

Avalanche is an open-source platform for launching decentralized finance applications and enterprise blockchain deployments in one interoperable, highly scalable ecosystem. Avalanche uses Proof-of-Stake, which allows tens of thousands of validators to have a first-hand say in the system while consuming minimal energy.

OpenSea supports the Avalanche C-Chain, which is used for smart contracts and is compatible with Ethereum.

Official website: https://zora.energy/

Token: ETH

The Zora Network is a fast, cost-efficient, and scalable Layer 2 built to help bring media onchain. Zora Network is designed to be secure by inheriting the security of Ethereum mainnet and is built using the OP Stack.

Official website: https://base.org/

Token: ETH

Base is a secure, low-cost, developer-friendly Ethereum Layer 2 built to bring the next billion users to web3. Base is the onchain home for Coinbase products, users, and assets, as well as an open ecosystem where anyone can build for them. Base was built using the OP Stack.

Official website: https://blast.io

Token: ETH

Blast is an Ethereum L2 chain.

Official Website: https://www.sei.io/

Token: SEI

Sei is an open-source L1 blockchain that uses a proof-of-stake consensus system and other innovations to optimize for speed, security, and scalability. SEI is the chain’s native token, and can be used to buy Sei NFTs using OpenSea. You can buy SEI from a supported cryptocurrency exchange.

Official Website: b3.fun

Token: ETH

B3 is a layer 3 (L3) gaming-focused blockchain built on Base. B3 is designed for quick and cost-efficient transactions, while utilizing Base's security and user-friendly features. It uses Base ETH bridged to B3 for transactions.

Official Website: https://www.berachain.com/

Token: $BERA

Berachain is an EVM-Identical Layer 1 blockchain, which means that whenever EVM is upgraded, Berachain is compatible with the latest version, too. It uses a novel Proof-of-Liquidity (PoL) system.

$BERA is Berachain’s native gas and staking token. EVM-compatible wallets, such as MetaMask, are compatible with Berachain.

Official Website: https://flow.com/

Token: FLOW

Flow is a decentralized EVM-equivalent L1 blockchain. Flow is compatible with EVM-compatible wallets like MetaMask, and relies on a script in Cadence, its native smart contract language, to integrate unique Flow features with EVM.

Its EVM blockchain explorer is Flowscan, and its native token, FLOW, is available on many cryptocurrency exchanges. It also has its own native wallet.

Official Website: https://apechain.com/

Token: $APE

ApeChain is an Arbitrum Orbit chain, leveraging Arbitrum’s security and infrastructure while operating as a distinct chain. ApeChain powers an entire ecosystem, and its native token, $APE, is used for gas fees.

Its blockchain explorer is Apescan. ApeChain is compatible with many web3 wallets like MetaMask.

Official Website: https://soneium.org

Token: ETH

Soneium is a creator-focused Ethereum Layer 2 blockchain. It aims to foster a collaborative, creative ecosystem connecting web3 and web2 internet services.

Its primary blockchain explorer is powered by Blockscout, and it uses ETH for gas. Soneium can be added as a network to any EVM-compatible wallet, like MetaMask.

Official Website: https://shape.network/

Token: ETH

Shape is a creator-focused EVM-equivalent blockchain. Shape creators receive back a portion of the gas spent by users using a concept called “gasback.”

The Shape network is compatible with EVM wallets, and uses ETH bridged to Shape.

Official Website: https://www.unichain.org/

Token: ETH

Provided by Uniswap Labs, Unichain is a decentralized L2 chain with extremely quick transaction speeds, low transaction costs, and supports cross-chain liquidity.

Unichain can be added to an existing Ethereum wallet.