> For the complete documentation index, see [llms.txt](https://docs.rome.builders/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rome.builders/id/kasus-penggunaan/defi-protocols.md).

# Protokol DeFi

Pola integrasi untuk DeFi EVM di Rome — lending dengan oracle Solana, menggabungkan Jupiter dan Kamino dari Solidity, serta pool likuiditas bersama.

Rome memungkinkan protokol DeFi EVM untuk disusun dengan ekosistem DeFi native Solana secara atomik. Halaman ini membahas pola integrasi umum. Beberapa sudah aktif di Rome — Aave v3, Compound v3 (Aerarium), Uniswap V2/V3/V4, dan Rome DEX — lihat [Aplikasi di Rome](/id/aplikasi-di-rome/apps.md).

Kode di bawah ini bersifat ilustratif; nama antarmuka untuk program Solana pihak ketiga adalah contoh, bukan antarmuka SDK yang dirilis.

## Mengapa DeFi di Rome?

* **Akses likuiditas Solana** — Jupiter, Kamino, Drift, Meteora, Raydium, Orca
* **Komposabilitas atomik** — operasi DeFi multi-langkah dalam satu transaksi
* **Perkakas Solidity** — ekosistem pengembangan dan audit yang familiar
* **State bersama** — pengguna EVM dan Solana berbagi pool yang sama

## Pola 1: Protokol Peminjaman dengan Oracle Solana

Impor di bawah ini berasal dari [`rome-solidity`](https://github.com/rome-protocol/rome-solidity), yang diinstal dari GitHub, bukan dari npm: `npm install github:rome-protocol/rome-solidity`, atau `forge install rome-protocol/rome-solidity` dengan remapping `@rome-protocol/rome-solidity/=lib/rome-solidity/` (detail di [Deploy Solidity Contracts](/id/panduan-pengembang/deploy-solidity.md#using-the-rome-solidity-sdk)). Lewatkan alamat feed dari [registry](/id/produk/oracle-gateway.md#consume-a-feed-in-three-steps) daripada meng-hardcode-nya.

```solidity
import {IAggregatorV3Interface} from "@rome-protocol/rome-solidity/contracts/oracle/IAggregatorV3Interface.sol";

contract RomeLending {
    IAggregatorV3Interface public priceFeed;

    constructor(address _priceFeed) {
        priceFeed = IAggregatorV3Interface(_priceFeed);
    }

    function getCollateralValue(uint256 amount) public view returns (uint256) {
        (, int256 price,,,) = priceFeed.latestRoundData();
        // Harga Pyth/Switchboard via Oracle Gateway
        // Antarmuka yang sama seperti Chainlink di Ethereum
        return (amount * uint256(price)) / 1e8;
    }
}
```

## Pola 2: Aggregator DEX via CPI

```solidity
contract RomeSwap {
    function swap(
        bytes32 fromMint,
        bytes32 toMint,
        uint256 amount,
        uint256 minOut
    ) external {
        // CPI ke Jupiter/Raydium/Meteora
        // Semua likuiditas DEX Solana dapat diakses dari Solidity
        CpiProgram.invoke(JUPITER_PROGRAM, accounts, swapData);
    }
}
```

## Pola 3: Vault Hasil

```solidity
contract YieldVault {
    function deposit(uint256 amount) external {
        // Menerima deposit USDC
        // CPI → Jupiter: tukar ke token optimal
        // CPI → Kamino: suplai sebagai agunan
        // CPI → Drift: buka lindung nilai netral delta
        // Semuanya atomik — satu tx, semua atau tidak sama sekali
    }
}
```

## Pola 4: Arbitrase Lintas Protokol

Menggunakan `RemusTx` (transaksi atomic lintas-rollup):

1. Beli di DEX A dalam rollup 1
2. Jual di DEX B dalam rollup 2
3. Keduanya secara atomik — risiko eksekusi nol

## Implementasi referensi

Fork aplikasi Rome yang sudah berfungsi alih-alih memulai dari halaman kosong:

* [**rome-dex**](https://github.com/rome-protocol/rome-dex) — AMM dua jalur; bawa ide baru dan terapkan untuk pengguna Solana dan EVM melalui satu pool.
* [**aerarium**](https://github.com/rome-protocol/aerarium) — UI peminjaman Compound v3 dua jalur.
* [**cardo**](https://github.com/rome-protocol/cardo) — portal distribusi aplikasi CPI (swap / lend / perps / compose).
* [**rome-aave-v3-demo**](https://github.com/rome-protocol/rome-aave-v3-demo) — UI peminjaman Aave v3.
* [**compound-on-rome-comet**](https://github.com/rome-protocol/compound-on-rome-comet) — kontrak pasar uang Comet.
* [**rome-oracle-gateway**](https://github.com/rome-protocol/rome-oracle-gateway) — aplikasi cross-VM greenfield: membaca akun harga Solana (Pyth, Switchboard), mempostingnya di EVM, dan menyediakannya ke Solidity melalui Chainlink standar `AggregatorV3Interface`.

## Terkait

* [Oracle Gateway](/id/produk/oracle-gateway.md) — feed harga yang kompatibel dengan Chainlink
* [Rome SDK](/id/produk/rome-sdk.md) — antarmuka bertipe untuk protokol DeFi


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