> For the complete documentation index, see [llms.txt](https://swing-4.gitbook.io/swing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swing-4.gitbook.io/swing/welcome-to-swing.md).
# Welcome to Swing
## **Introduction**
[Swing](https://swing.xyz/) is **cross-chain infrastructure for the internet**. It is an interoperability protocol that unifies multi-chain liquidity to enable arbitrary cross-chain interactions. It serves as an open standard and common building block for developers and traders needing cross-chain exchange functionality. Swing aggregates liquidity from major blockchains, cross-chain bridges, and decentralized liquidity sources.
### How can I use Swing?
#### [Swing API/SDK](/swing/build-with-swing/start-here.md) for developers
**➡** Build dApps with cross-chain liquidity and interoperability at its core
**➡** Integrate at the smart contract or application layer
**➡** Keep users on your interface for on-chain and cross-chain swaps
#### [Swing App](https://app.swing.xyz/) for crypto traders and investors
**➡** Easily trade and move crypto across layer 1 and 2 blockchains
**➡** Find the best route (cheapest, fastest or highest amount) for cross-chain swaps
## **Swing developers build cross-chain dApps with a few lines of code**
Swing simplifies how developers integrate and route cross-chain liquidity into everyday dApps.
🔥 Get Started
Learn about Swing's key concepts and get started today
⛓ Swing API
Explore server-side API libraries and integrate with API endpoints
🖥 Swing SDK
Explore the SDK to build and customize apps with Swing
### What can I build on Swing?
💵 Cross-chain wallets
🤖 Cross-chain arbitrage bots
🏪 Cross-chain NFT marketplaces
📊 Cross-chain yield aggregators
📈 Cross-chain DEXes
🏦 Cross-chain money markets
