Marginfi is a decentralized liquidity aggregation protocol built on the Solana blockchain that allows users to access a range of lending markets through a single platform, supporting cryptocurrencies such as SOL, USDC, USDT, wBTC (Portal), ETH (Portal), and BONK. The platform pools liquidity from various sources, offering competitive interest rates to lenders and lower interest rates to borrowers. Marginfi plans to introduce cross-composing in the future, enabling users to trade between different assets on the platform, further enhancing liquidity and providing more opportunities for investment returns.

Marginfi's protocol is made up of several key components, each playing a critical role in providing users with a reliable and efficient platform for managing their liquidity.

At the heart of the Marginfi protocol is the marginfi group. This group is a core component that enables users to manage risk and pool their resources to access lending markets more efficiently. Each marginfi group has a lending pool with unlimited banks. Within the lending pool, users can borrow and lend assets, which are then used to generate interest and distribute it among the members of the group. The marginfi group is responsible for managing the risk associated with these activities and ensuring that the borrowing and lending activities are within acceptable risk parameters.

Each bank within the lending pool has its own mint account and a custom oracle, currently limited to Pyth but will soon support Switchboard. This allows Marginfi to tap into multiple sources of liquidity and provide users with access to a diverse range of lending markets. Users can contribute liquidity to the lending pool and earn interest on their contributions. Users can also borrow from the pool to manage their own liquidity needs.

Marginfi accounts are used by users to interact with the protocol. Each marginfi account belongs to a single group and can borrow up to 16 assets simultaneously, providing users with greater flexibility in managing their liquidity. Users can deposit assets into their marginfi account and use them to borrow other assets or lend them to the lending pool. The account balance and borrowing capacity are continuously updated based on user activity and the risk associated with their borrowing and lending activities.

To maintain account health, Marginfi uses a deterministic risk engine that monitors user activity and ensures that borrowing and lending activities are within acceptable risk parameters. The risk engine uses a variety of metrics, including asset prices, volatility, and liquidity, to determine the appropriate risk parameters for each user's marginfi account. If a user's account falls below the minimum required health factor, they may be subject to liquidation to protect the integrity of the lending pool and other users' accounts.

Overall, Marginfi's architecture is designed to provide users with a powerful and flexible platform for managing their liquidity. By leveraging marginfi groups, multiple banks, marginfi accounts, and a robust risk management system, the platform is able to offer competitive interest rates and reliable access to a wide range of lending markets.

                     ┌────────────┐       ┌────────────┐       ┌───────────┐       ┌──────────┐
                     │ Marginfi   |       │ Lending    │       │           │       │ Price    │
                     │ Group      │1─────1│ Pool       │1─────n│ Bank      │m─────n│ Oracle   │
                     │            │       │            │       │           │       │          │
                     └────────────┘       └────────────┘       └───────────┘       └──────────┘
                           1                    1
                           │                    │
                           │                    │
                           n                    1
┌───────────┐        ┌────────────┐       ┌────────────┐
│           │        │ Margin     │       │ Lending    │
│ Signer    │1──────n│ Account    │1─────1│ Account    │
│           │        │            │       │            │
└───────────┘        └────────────┘       └────────────┘

One of the key features of Marginfi is its risk management system. Risk is managed at the marginfi group level, where each bank defines its own risk parameters and uses asset and liability weights to determine loan-to-value ratios (LTVs). Assets can be isolated to reduce the risk of contagion, and real-time risk monitoring is used to assess changing market conditions and adjust risk parameters as needed. Marginfi's risk management system is transparent and deterministic, providing users with clear information about their risk exposure. If a user's account falls below the minimum required health factor, they may be subject to liquidation to protect the integrity of the lending pool and other users' accounts.

Key points:

• Marginfi has a robust risk management system.
• Risk is managed at the marginfi group level.
• Each bank defines its own risk parameters.
• Assets can be isolated to reduce contagion risk.
• Real-time risk monitoring is used to assess changing market conditions.
• Marginfi's risk management system is transparent and deterministic.
• Liquidation may occur if a user's account falls below the minimum required health factor.