> For the complete documentation index, see [llms.txt](https://venzofinance.gitbook.io/venzofinance-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://venzofinance.gitbook.io/venzofinance-docs/venzo-swap/chain-abstraction-engine.md).

# Chain Abstraction Engine

The Venzo Swap engine operates across multiple networks, including Bitcoin, Solana, Ethereum, Arbitrum, BNB Chain, and Tron. By abstracting the underlying blockchain infrastructure, users can swap assets seamlessly without needing to hold native gas tokens for each network.

The Chain Abstraction Engine works by maintaining a unified liquidity layer that aggregates available liquidity across all supported chains. When a user initiates a swap, the engine:

1. Identifies the source and destination chains based on the selected asset pair.
2. Queries liquidity depth across all available venues on both chains, including decentralized exchanges (DEXs), automated market makers (AMMs), and order book-based exchanges.
3. Calculates the optimal route considering gas costs, bridge fees, slippage, and execution speed.
4. Executes the swap atomically, handling all intermediate steps (bridging, wrapping, unwrapping) transparently in the background.

The user experience is identical regardless of whether the swap occurs within a single chain or across multiple chains. The complexity of cross-chain communication, bridge security, and gas management is entirely abstracted away.

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