> For the complete documentation index, see [llms.txt](https://docs.smardex.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.smardex.io/p2p-lending/advanced-concepts.md).

# Advanced Concepts

### Technical Features

* **Permit2 Integration**: Token approvals are handled via signature using [Uniswap's Permit2](https://blog.uniswap.org/permit2-and-universal-router). This simplifies the user experience by eliminating separate approval transactions, while also reducing gas costs and improving security.
* **ERC721 Loan NFTs**: Each loan is represented as a unique NFT containing all relevant loan data. These NFTs can include metadata for display in wallets and platforms, making them easier to track and manage.

### Governance

* **ADMIN-Controlled Parameters:** The protocol is governed by a single ADMIN address, limited to adjusting only the SDEX fee and the minimum lending amount. This ensures controlled evolution while maintaining simplicity and security.
* **Immutable Smart Contracts**: The core contracts are not upgradable, ensuring long-term security and trustlessness. Once deployed, the logic cannot be changed.
* **No Emergency Pause**: There are no pause switches or backdoors — the protocol operates in a fully decentralized and unstoppable manner.