ImmutableX is a layer-2 scaling solution for NFTs on Ethereum. Users can receive instant trade confirmation and near-zero gas fees for minting and trading NFTs as well as easily create and trade NFTs without compromising the security of their assets. Developers can use ImmutableX to achieve scalability. NFTs can be bought and sold on any marketplaces built on ImmutableX.


Metis’ Layer 2 network, which bundles Ethereum transactions and processes them off-chain then returns them to Ethereum for recording, aims to improve Ethereum scalability. Metis provides an NFT bridge between its Andromeda network and Ethereum, NFTstorage, a framework for its DAO, decentralized autonomous companies (DACs), andmiddleware to help developers manage their smart contracts. The Metis token (METIS) is used in the Metis ecosystem for staking andtransaction fees.

Celer Network

As a blockchain interoperability protocol, Celer enables a one-click user experience accessing tokens, DeFi, GameFi, NFTs, governance, and more across multiple chains. The dApps that are Celer-enabled will provide users access to efficient liquidity utilization, coherent application logic, and shared states via a single-transaction UX.


Founded in 2019, Optimism is an L2 blockchain built by Ethereum developers that processes its transactions in batches using optimistic rollups. Users gain access to cheap and near instantaneous transactions are cheap and nearly instantaneous. Developers can use Optimism as a fast, stable, scalable and secure solution to programs requiring Ethereum apps.


Arbitrum is an Eth layer2 scaling solution that supports smart contracts without the limitations of scalability and privacy. Users enjoy low transaction fees and less congestion on Arbitrum. Arbitrum allows developers to create smart contracts by using code to specify the behavior of a virtual machine (VM) that implements the contract’s functionality. Additionally, developers can use Arbitrum for dramatic improvements in scalability and privacy.


StarkNet is a Zero-Knowledge Rollup (ZK-Rollup) that is decentralized, permissionless, and censorship-resistant. It supports general computation over Ethereum. Developers create applications on StarkNet allowing users to send transactions the same way they do with Ethereum today. All StarkNet transactions are periodically batched, and their validity is proven on a stark proof, which is then verified on the Ethereum Blockchain.