> For the complete documentation index, see [llms.txt](https://docs.cexiswap.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cexiswap.io/cexiswap/protocol-architecture.md).
# Protocol Architecture
### CEXISWAP Router Contract instance
Each supported chain would have a CEXISWAP Router Contract instance acting as the entry point for smart contract on-chain interactions.
### Liquidity Vault instance
Each liquidity provider in the CEXISWAP liquidity network has their own Liquidity Vault instance providing both on-chain and off-chain liquidity.
### Trade Oracle service
Each liquidity provider in the CEXISWAP liquidity network would operate their own Trade Oracle service which controls the flow of the liquidity provided.
### CEXISWAP API Endpoint
The multi-chain API endpoint encapsulates knowledge about blockchains in an easy-to-use REST API. See the [example code](/cexiswap/api.md).
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