> For the complete documentation index, see [llms.txt](https://support.cardstack.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.cardstack.com/cardstack-products-and-environment/card-protocols/card-bridge-protocol.md).

# Card Bridge Protocol

This protocol allows you to deposit and withdraw tokens between layer 1 and layer 2. You can onboard tokens (e.g. stablecoins) from layer 1 to the much cheaper, easier, and faster layer-2 network. Once you’ve earned something on layer 2, you can use the bridge to go the other way and bring your tokens back to layer 1. The bridge enables us to conduct exchanges with other blockchains, especially ones in the Ethereum ecosystem.