As blockchain applications scale, the Ethereum mainnet faces rising transaction costs and network congestion. Layer 2 scaling solutions have become a critical path to boosting blockchain performance, with Rollup technology now one of the most dominant scaling architectures. However, building a new Rollup network still demands complex development, maintenance, and upgrades, raising the barrier to innovation in blockchain infrastructure.
OP Stack emerged as a modular development framework in this context. As a key infrastructure piece within the Optimism ecosystem, OP Stack provides developers with standardized components and an open architecture, making it far more efficient to build Layer 2 networks.
What Is OP Stack?
OP Stack is an open-source modular blockchain development framework launched by Optimism, designed to help developers build Ethereum-compatible Layer 2 networks.
Unlike traditional blockchains that require redesigning from scratch, OP Stack offers a standardized set of components, enabling developers to quickly build Rollup networks compatible with the Ethereum Virtual Machine (EVM).
At its core, OP Stack is not a standalone blockchain but a toolkit for building blockchains. Development teams can select and combine different modules based on their needs, creating Layer 2 networks with independent brands, governance systems, and economic models.
OP Mainnet itself is one of the networks built on OP Stack.
What Core Modules Make Up OP Stack?
OP Stack adopts a layered design, with each module responsible for distinct functions.
Execution Layer
The Execution Layer handles user transactions and smart contract execution. Solidity contracts and EVM applications—familiar to most developers—run on this layer, meaning the vast majority of Ethereum applications can be migrated directly to networks built on OP Stack.
Settlement Layer
The Settlement Layer is responsible for transaction finality. Currently, most OP Stack networks use Ethereum as the settlement layer, relying on its mainnet for ultimate security guarantees.
Sequencing Layer
The Sequencing Layer receives and orders user transactions. The sequencer batches large numbers of transactions into blocks and submits them to Layer 1, reducing transaction costs and improving processing efficiency.
Data Availability Layer
The Data Availability Layer stores transaction data. By making transaction information publicly available, network participants can verify state changes and perform independent audits.
Governance Layer
The Governance Layer manages protocol upgrades, parameter adjustments, and ecosystem governance. Networks built on OP Stack can adopt independent governance mechanisms or participate in the broader Superchain’s collaborative governance.
How Does OP Stack Support Rollup Network Operations?
One of OP Stack’s core design goals is to provide a unified infrastructure for Rollup networks.
When a user initiates a transaction, the sequencer orders and executes it, generating new state data. This data is then compressed and sent to Ethereum for storage and settlement.
Throughout this process: users submit transactions → the sequencer executes them → state updates are generated → Rollup data is uploaded to Ethereum → final confirmation is completed.
This model inherits Ethereum’s security while significantly lowering on-chain execution costs. As a result, OP Stack is widely regarded as a key infrastructure layer for building Optimistic Rollup networks.
How Does OP Stack Differ From Other Blockchain Development Frameworks?
With the rise of modular blockchains, multiple development frameworks now compete in the market.
OP Stack vs. Cosmos SDK
Cosmos SDK is primarily designed for building independent sovereign blockchains. Networks using Cosmos SDK typically run their own validator sets and consensus mechanisms, whereas OP Stack networks generally depend on Ethereum for final settlement and security.
OP Stack vs. Polygon CDK
Polygon CDK enables developers to create Layer 2 networks based on zero-knowledge proofs (ZK Proofs). In contrast, OP Stack currently focuses on the Optimistic Rollup architecture.
OP Stack vs. Arbitrum Orbit
Arbitrum Orbit also allows developers to build custom Layer 2 or Layer 3 networks. Both emphasize standardized scaling, but OP Stack places a stronger emphasis on unified collaboration and shared upgrade mechanisms within the Superchain ecosystem.
| Dimension |
OP Stack |
Cosmos SDK |
Polygon CDK |
Arbitrum Orbit |
| Core Positioning |
Layer 2 Framework |
Sovereign Chain Framework |
ZK Rollup Framework |
Rollup Framework |
| Security Source |
Ethereum |
Own Validators |
Ethereum |
Ethereum |
| Modularity Level |
High |
High |
High |
High |
| Superchain Collaboration |
Supported |
Not Applicable |
Partial Support |
Partial Support |
| EVM Compatibility |
Native Support |
Optional |
Native Support |
Native Support |
What Is the Relationship Between OP Stack and Superchain?
OP Stack is the technical foundation of the Superchain.
The Superchain is not a single blockchain but a collaborative ecosystem of multiple networks built on the OP Stack standard.
Because all member chains share the same technical framework, they achieve unified upgrade mechanisms, shared development tools, standardized cross-chain interactions, and higher ecosystem compatibility.
This model mirrors open protocol standards on the internet. Different websites operate independently but can interconnect through unified protocols. OP Stack provides that standardized foundation for the Superchain.
Which Projects Are Using OP Stack?
OP Stack has become one of the most widely adopted Layer 2 development frameworks.
OP Mainnet
The Layer 2 network officially operated by Optimism.
Base
A Layer 2 network launched by Coinbase and a key component of the Superchain ecosystem.
World Chain
A blockchain network launched by the World project, built on OP Stack.
Ink
A Layer 2 network launched by Kraken, also built on the OP Stack architecture.
As more projects join the Superchain, OP Stack’s ecosystem influence continues to grow.
What Challenges Does OP Stack Face?
Despite its rapid growth, OP Stack faces several challenges.
The modular blockchain space is fiercely competitive, with frameworks like Polygon CDK, Arbitrum Orbit, and zkSync Hyperchains all vying for developer attention.
Meanwhile, liquidity remains fragmented across different Layer 2 networks, and user experiences are not yet unified.
As the Superchain expands, achieving cross-chain governance coordination, standard upgrades, and ecosystem balance will remain critical long-term challenges.
Summary
OP Stack is a modular blockchain development framework launched by Optimism. Through standardized components, it enables developers to quickly build Ethereum-compatible Layer 2 networks. Its core architecture consists of the Execution Layer, Settlement Layer, Sequencing Layer, Data Availability Layer, and Governance Layer—achieving modularization and standardization for Rollup network development.
As the technical backbone of the Superchain ecosystem, OP Stack has already been adopted by leading projects including OP Mainnet, Base, World Chain, and Ink. As modular blockchains become an industry trend, OP Stack is driving Layer 2 networks from isolated scaling solutions toward an open, collaborative ecosystem.
FAQs
What is the relationship between OP Stack and Optimism?
Optimism refers to the Layer 2 network and its ecosystem, while OP Stack is the modular development framework launched by Optimism. The Optimism mainnet itself is built on OP Stack.
Can OP Stack only be used for the Optimism network?
No. Any development team can use OP Stack to create their own Layer 2 network. Projects such as Base, World Chain, and Ink are all built on OP Stack.
Why does OP Stack emphasize modularity?
Modular design allows each functional layer to be independently optimized and upgraded, improving scalability and reducing the complexity of building and maintaining blockchain networks.
What is the difference between Superchain and OP Stack?
The Superchain is a collaborative ecosystem of networks built on OP Stack, while OP Stack is the underlying technical framework that powers those networks.
