> For the complete documentation index, see [llms.txt](https://docs.butternetwork.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.butternetwork.io/readme.md).

# Introduction

## **Cross-chain Routing API, Omnichain Messaging & ZK Light-Client Infrastructure**

Butter Network provides developer infrastructure for building secure, fully onchain cross-chain applications.

These docs explain how to integrate cross-chain swaps, omnichain messaging, and interoperability flows powered by Butter’s ZK light-client technology.

Butter is designed for developers building wallets, DEXs, dApps, and protocols that require trust-minimized cross-chain execution — without multisigs, external validators, or centralized relayers.

***

## **Getting started**

If you are new to Butter Network, start with:

1. [**About Butter Network**](/about-butter-network.md)
2. [**Understanding the ZK Light Client**](/zk-light-client/understanding-light-client.md)
3. [**Cross-chain Flow & Omnichain Development**](/omnichain-development/cross-chain-flow.md)
4. [**Integration Guides for APIs and smart contracts**](/butter-bridge-integration/integration.md)

***

## **What you can build with Butter Network**

Using Butter Network, developers can:

* Enable **one-step cross-chain swaps** across Bitcoin, EVM chains, Solana, and TRON
* Integrate **cross-chain routing** that combines bridging and onchain swapping into a single flow
* Build **omnichain applications** with verified cross-chain execution
* Access **non-custodial liquidity routing** sourced directly from onchain DEX and AMM pools
* Leverage **ZK light-client verification** for secure, trust-minimized settlement

Butter’s architecture is optimized for composability, safety, and production-ready integrations.

***

## **Core documentation sections**

### **🔥** [**About Butter Network**](/about-butter-network.md)

High-level overview of Butter’s architecture, design philosophy, and role as an omnichain interoperability hub.

### **🔥** [**ZK Light Client**](/zk-light-client/understanding-light-client.md)

Learn how Butter uses ZK-powered light-client verification to validate source-chain state and enable secure cross-chain execution.

### **🔥** [**Omnichain Development**](/omnichain-development/cross-chain-flow.md)

Understand cross-chain flows, omnichain isomorphism, and how to design applications that operate seamlessly across multiple blockchains.

### **🔥** [**Omnichain Messaging Integration**](/butter-omnichain-messaging-integration/butter-omnichain-service.md)

Guides for integrating omnichain messaging, including API usage, contracts, and deployment references.

### **🔥** [**Butter Bridge & Routing Integration**](/butter-bridge-integration/integration.md)

Step-by-step guides for integrating cross-chain swaps, routing APIs, contract interfaces, fee models, and deployed contracts.

***

## **Who should use these docs**

These docs are intended for:

* Wallet teams integrating cross-chain swaps
* DEXs and aggregators expanding cross-chain support
* dApp developers building omnichain products
* Infrastructure teams requiring secure cross-chain execution
* Protocols looking to integrate Bitcoin and non-EVM chains into their stack

For integration support or partnership inquiries, visit the [**Integrations**](https://www.butternetwork.io/en/integrations) page on the main site.