# CAT Bridge Anyone can build on top of the warp.green cross-chain messaging protocol. At launch, we provided two simple example applications, one of which is called the CAT Bridge. This app allows XCH (native currency of the Chia blockchain) and CATs (tokens on the Chia blockchain following the official token standard) to be wrapped into ERC-20 tokens on EVM chains (Ethereum/Base) . The WrappedCAT contract can be found [here](https://github.com/warpdotgreen/cli/blob/master/contracts/WrappedCAT.sol), and puzzles can be found [here](https://github.com/warpdotgreen/cli/tree/master/puzzles/wrapped_cats). Instead of a contract or singleton owning funds, CATs that have been wrapped are locked in a special puzzle to form a vault coin. The vault coin can only be spent by an unlocker puzzle, which only runs when the equivalent ERC-20 token is burned. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.warp.green/developers/cat-bridge.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.