Stacks is a Bitcoin L2, bringing smart contract functionality to Bitcoin, without modifying Bitcoin itself. Stacks takes a pyramid approach, where you have the foundational settlement layer at the bottom (Bitcoin), and then a layer on top of that to add smart contracts and programmability (Stacks), and then layers on top of that for scalability and speed (Hiro's Subnets).

Arbitrum, created by the Offchain Labs team, is an Ethereum Layer2 scaling solution based on Optimistic Rollup technology. It leverages the ability to communicate between L1 and L2, allowing any form of Ethereum asset to be transferred between Layer 1 and Layer 2 without the need for trust. Even though Arbitrum transactions are still settled on Ethereum, only raw transaction data is submitted to Ethereum, with execution and contract storage occurring off-chain. This makes the gas fee required on Arbitrum much smaller than on the mainnet, and contracts are fully compatible with no gas limit.

Sophon is an entertainment-focused ecosystem built as a modular rollup leveraging zkSync’s ZK Stack technology. As a ZK chain leveraging the ZK Stack, Sophon is intended to be tailored for any high throughput applications such as artificial intelligence and gaming.

Mantle is a high-performance Ethereum layer-2 network built with a modular architecture that delivers low fees and high security. Builders can use Mantle's unique design to create dApps with an exceptional user experience, while also relying on Ethereum's unparalleled security. Mantle is a product of BitDAO and is governed by the $BIT community.

Optimism is an Ethereum Layer 2 solution that utilizes optimistic rollup technology. It drastically reduces costs and transaction times while preserving the benefits of Ethereum's security.

StarkNet is a permissionless, decentralized Validity-Rollup (also known as a "ZK-Rollup"). It operates as an L2 network over Ethereum, enabling any dApp to achieve unlimited scalability for its computations without compromising Ethereum's composability and security. This is possible due to StarkNet's reliance on the safest and most scalable cryptographic proof system: STARK.

Epic Chain is an Ethereum Layer 2 solution built specifically for global entertainment brands. Global brands and talent will be able to use Epic Chain's technology to store their IP on-chain and engage with fans through next-generation content and experiences.

Vision is a European compliance Layer 2 network designed for RWA. It aims to bridge traditional finance (TradFi) and decentralized finance (DeFi) through compliant and scalable tools, focusing on promoting the tokenization of real-world assets (RWA), such as bonds, ETFs, etc., to achieve fragmented ownership and on-chain transactions.

Merlin Chain is a Bitcoin Layer 2 powered by Bitmap, building upon the native assets, protocols, and products on Bitcoin Layer 1, to Make Bitcoin Fun Again.

B² Network is a EVM-compatible Rollup based on zero-knowledge proof verification commitment on Bitcoin. Rollup data and zk proof verification commitments are recorded on the Bitcoin Network, finally confirmed via a challenge-response mechanism.

Lisk is a cost-efficient, fast, and scalable Layer 2 (L2) network based on Optimism (OP) that is secured by Ethereum. Built on the MIT-licensed OP Stack and partnered with Gelato as a RaaS provider, Lisk contributes to scaling Ethereum to a level where blockchain infrastructure is ready for mass adoption.

zkSync is a Layer-2 scaling solution that preserves the security properties of the underlying blockchain by leveraging the latest generation of succinct zero-knowledge proofs. All funds in zkSync are held in a smart contract on the mainchain, while computation and storage are performed off-chain. For each Rollup block, a state transition zero-knowledge proof (SNARK) is generated and verified by the mainchain contract. This SNARK includes the proof of the validity of every transaction in the Rollup block.

Linea is a layer2 Zero Knowledge Ethereum Virtual Machine (zkEVM). It replicates the Ethereum environment as a rollup, allowing developers to build on it as they would on Ethereum mainnet. This provides users with the same experience and security guarantees of Ethereum, but with reduced transaction costs.

Immutable X operates as the first-ever Layer 2 scaling solution for NFTs on the Ethereum blockchain. It utilizes zk rollup technology to address high gas fee and scalability issues when minting and trading NFTs.

ADI Chain is a blockchain infrastructure designed entirely by artificial intelligence and powered by GPU computing. It provides high-performance infrastructure for finance, identity authentication, healthcare and other fields.

Status Network is a native gas-free L2 that provides sustainable funding for application developers. The Status Network is part of the Status ecosystem.

Adventure Layer is an L2 on top of Berachain, custom made for Fully Onchain Games (FOCG), built by the Adventure Gold DAO. Adventure Layer focuses on supporting FOCGs that at their core resembles a financial market. The Adventure Gold token ($AGLD), once a fair launch token airdropped to the Loot NFT in 2021, now focuses on incentivising player activities & liquidities in FOCGs, empowered by a community arose from the Loot NFT.

Solaxy is a Layer2 solution that expands the massive Ethereum ecosystem, while enhancing the strength of Solana.

Metal L2 is a blockchain solution that provides fast, scalable, and compliant transactions, serving as the connective layer for seamless asset transfers and dApp operations.

Janction is a Layer2 network that provides verifiable, collaborative, and scalable AI services. Janction uses smart contracts to automate and activate machine learning and artificial intelligence. Key elements such as AI models, GPU computing power, data feeds, and data markup are all integrated into Janction for collaborative processing.

BitcoinOS is the scalable smart-contract layer for Bitcoin allowing developers to build interoperable rollups, dapps and DAOS, bringing scalability, privacy and DeFi to Bitcoin. BitcoinOS is the Bitcoin Superchain: interoperable rollups secured by Bitcoin with near trustless rails for BTC and other Bitcoin-native assets.

The Sink is an L2 chain designed to carry native-yield to its logical conclusion and create a positive sum metagame for outcome-driven dApps and users.

OP NET is a metaprotocol operating outside the Ordinals envelope that is designed to integrate seamlessly with Bitcoin while introducing a comprehensive suite of smart contract capabilities, At its core, OP NET functions to transform the programmability of the Bitcoin blockchain into the programmability of smart blockchains like Ethereum. Utilizing Tapscript, OP NET creates a fully expressive smart contract environment that operates within Bitcoin's existing framework. This approach retains Bitcoin's role as the foundational layer for data availability, consensus, and settlement, enhancing its functionality without compromising its core principles and without the need for BlPs/core protocol changes.

Fractal Bitcoin is a Bitcoin scaling solution that gradually extends the Bitcoin blockchain into a scalable computing system without breaking consistency with the Bitcoin main chain.

Haust Network is an Application Absolute Liquidity Network and will be built for compatibility with the Ethereum Virtual Machine (EVM). Haust to deliver native yield to all user’s assets. Within the Haust Wallet in Telegram after launching mainnet users can spend and earn on their crypto in one easy place, all at the same time. Haust Network will earn yield by leveraging its network of auto-balancing smart contracts that interact across multiple blockchains then effectively channelling their generated yield back to its users.

Rayls is the EVM-compatible blockchain ecosystem that provides enterprise-grade privacy, scalability, interoperability, and decentralization simultaneously. It enables financial institutions to tokenise financial and real-world assets (RWA), adopt central bank digital currency (CBDC) payments, streamline cross-border FX and intra-institution payments. Rayls' hybrid architecture combines private subnets for banks with a public chain for DeFi. Financial institutions install Rayls Nodes on-premises, connecting to a central hub for private transactions. These same nodes connect to the public chain, enabling regulated asset issuance with global distribution.

Tokamak Network is an on-demand Ethereum Layer 2 platform that provides Rollup and zero-knowledge technologies designed to improve the speed and security of blockchain platforms.

Evernode is a permissionless, decentralised “layer 2” network tailored to hosting hyper-flexible, hyper-scalable dApps that perform as bespoke mini-blockchains (“AppChains”), empowering developers to build with their choice of language, functionality, geography, and scale, but without needing to invent their own consensus mechanism.

Kinto is an L2 focused on providing safe access to financial services. It's built on top of the Ethereum network using the OP Stack, and it's non-custodial, transparent, permissionless, and governed by the community. Kinto has been designed from the ground up to provide a safe environment for users and financial institutions. Kinto provides KYC, insurance, and AML & fraud monitoring at the blockchain level by default.

EthStorage is a layer 2 solution that provides programmable, dynamic storage based on Ethereum's data availability. It will greatly reduce the storage cost of storing large amounts of data on Ethereum, saving it to 1% to 0.1%. The low cost of large data storage by EthStorage can better enable a fully decentralized network in the future. It is highly integrated with EVM and is compatible with Solidity, Remix, Hardhat, and MetaMask. The team has received a research grant from the Ethereum Foundation for data availability research.