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

# Introduction to Universal Liquidity

> Unifying users' assets across all chains.

**Universal Liquidity** is the mechanism powering [Universal Accounts](/intro/universal-accounts)' cross-chain transactions. It allows for the automatic and atomic routing of liquidity across chains on a per-transaction basis—without the need for users to manually bridge, swap, or move tokens between networks.

This functionality is built into **Particle's Universal SDK**, enabling developers to give users a single, unified balance across all supported chains. The SDK handles everything: sourcing funds, executing cross-chain logic, and coordinating network settlement.

For example, if a user wants to transact with a Universal Account on a chain where they don’t hold funds, **Universal Liquidity** automatically pulls the required tokens from their balances on other chains. The process is invisible to the user, and they can pay gas in **any token**, on any chain.

<Frame caption="Example of cross-chain transaction execution with Particle Network.">
  <img className="block dark:hidden" src="https://mintcdn.com/uasdev/MyqJEt0BwqMsrEkq/intro/images/universal-liquidity.png?fit=max&auto=format&n=MyqJEt0BwqMsrEkq&q=85&s=e26616fdab2581162a35ac5446966f40" alt="Universal Liquidity" width="1360" height="763" data-path="intro/images/universal-liquidity.png" />

  <img className="hidden dark:block" src="https://mintcdn.com/uasdev/MyqJEt0BwqMsrEkq/intro/images/universal-liquidity.png?fit=max&auto=format&n=MyqJEt0BwqMsrEkq&q=85&s=e26616fdab2581162a35ac5446966f40" alt="Universal Liquidity" width="1360" height="763" data-path="intro/images/universal-liquidity.png" />
</Frame>

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## How Is This Possible?

Universal Liquidity is made possible through the **Particle Chain**'s Modular Nodes and Decentralized Messaging Network. These, alongside Bundler Nodes, allow Universal Liquidity to automate the execution of operations across chains, enabling a universal balance capable of being consumed on any blockchain.