> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# OP Stack Interoperability

> Learn the basics of interoperability and how to get started building cross-chain applications.

OP Stack interoperability is the next major scalability improvement to the OP Stack which enables a network of chains to feel like a single blockchain. This revolutionary approach unlocks 1-block latency and trust-minimized cross-chain composability.

## What is OP Stack Interoperability?

OP Stack interoperability enables:

* **Native asset transfers**: ETH and ERC-20 tokens move securely between chains via native minting and burning
* **Cross-chain composability**: Smart contracts can compose with data across multiple chains
* **Horizontal scalability**: Applications can scale across multiple chains seamlessly

## Key Benefits

<CardGroup cols={2}>
  <Card title="Liquidity Efficiency" icon="droplet">
    Eliminates liquidity fragmentation by enabling native asset transfers without wrapping or liquidity pools
  </Card>

  <Card title="Enhanced UX" icon="user">
    Users experience seamless cross-chain interactions without complex bridging processes
  </Card>

  <Card title="Developer Flexibility" icon="code">
    Build applications that can leverage resources and data from multiple chains
  </Card>

  <Card title="Scalability" icon="arrow-trend-up">
    Horizontal scaling across multiple chains while maintaining security
  </Card>
</CardGroup>

## Getting Started

<Steps>
  <Step title="Learn the Basics">
    Understand how OP Stack interoperability works by reading our [comprehensive explainer](/op-stack/interop/explainer)
  </Step>

  <Step title="Estimate Costs">
    Learn about [cross-chain transaction costs](/app-developers/guides/interoperability/estimate-costs) and how to optimize them
  </Step>

  <Step title="Build Your App">
    Start building with our [development tools and tutorials](/app-developers/tutorials/interoperability/)
  </Step>
</Steps>

## Next Steps

Ready to start building? Check out these resources:

* [OP Stack Interoperability Explainer](/op-stack/interop/explainer) - Deep dive into the technical details
* [Development Tools](/app-developers/tools/development/supersim) - Discover tools for building cross-chain applications
* [Tutorials](/app-developers/tutorials/interoperability/) - Step-by-step guides for common use cases

<Info>
  OP Stack interop is in active development. Some features may be experimental or subject to change.
</Info>