# Bridge

## Introduction

The Bridge just transfers tokens from a user to another wallet (could be themselves) on a different chain. Since no call data is involved, no target contract is needed.

## How does the Bridge work?

BIM Exchange aggregates various asset bridges and decentralized exchanges (DEXs) into a unified meta-bridge, selecting the most suitable route based on criteria like cost, speed, or security. By integrating DEXs and aggregators, users can seamlessly transfer tokens between different blockchains, such as swapping token A on chain X for token B on chain Y. Built on [<mark style="color:orange;">Bungee</mark>](https://docs.bungee.exchange/), BIM Exchange supports two bridging methods:

* **Single Transaction Bridge:** Enables one-step token transfers between chains, though limited by supported tokens on the destination chain.
* **Multi-Transaction Bridge:** Allows more flexible bridging by combining swaps and transfers across chains.

## Architecture and Operations

BIM Exchange’s infrastructure consists of on-chain smart contracts and an optional off-chain component:

* **On-Chain:** Bungee smart contracts manage token transfers across chains.
* **Off-Chain:** A backend quoting engine and API determine the optimal bridging routes, working with liquidity data from DEXs.

The process involves multiple steps, including generating quotes, approvals, and executing transactions for a seamless bridging experience. For more details, refer to the [<mark style="color:orange;">contract, backend architecture</mark>](https://docs.bim.finance/faq/bridge/contract-architecture) and [<mark style="color:orange;">life</mark>](https://docs.bim.finance/faq/bridge/lifecycle-of-bridging-session)[<mark style="color:orange;">cycle of bridging session</mark>](https://docs.bim.finance/faq/bridge/lifecycle-of-bridging-session).

## Bridge Fees <a href="#swap-fees" id="swap-fees"></a>

Bridge fees are available [<mark style="color:orange;">here</mark>](https://docs.bim.finance/whitepaper/overview/bim-exchange-dex-cex/bridge)


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