Aave has laid out the core structure behind V4, centering the upgrade on a Hub-and-Spoke lending model. In this design, Hubs hold liquidity, while Spokes function as separate borrowing markets with their own collateral assets and risk settings. Spokes can tap connected Hubs through credit lines. The idea is simple: keep markets separated, but let them access shared liquidity when needed.
Aave framed V4 as the next step in its own lending evolution. The path runs from ETHLend’s peer-to-peer model to pooled markets, and now to a modular system built for crypto-native lending, institutional credit, and real-world asset use cases. In Aave’s view, market structure shapes how liquidity is organized, how collateral is managed, how borrowing takes place, and how risk is controlled. If the structure works well, liquidity fragmentation falls and coordination costs for users come down.
The trade-off between efficiency and isolation is central
Aave’s explanation puts the core tension in lending design out in the open. Stronger risk isolation can reduce capital efficiency; higher capital efficiency can increase shared exposure. Traditional lending venues often suffer from fragmented markets, isolated pools of capital, and settlement frictions. Smart contracts can automate much of that flow and aggregate liquidity across open networks, but aggregation still raises a harder question: how much risk should be shared, and under what limits?
V4 answers that by separating the functions of liquidity storage and market-level risk. Spokes preserve independent risk configurations, Hubs supply base liquidity, and credit lines connect the two layers. Aave said this setup allows clearer boundaries between markets with different risk profiles while keeping capital accessible across the system. Each market can also maintain defined exposure limits through capped credit lines.
One framework, several market structures
Aave outlined multiple market types that V4 can support. The first is a paired asset market, where one collateral asset backs one borrowable asset. The second is a multi-asset singleton market, similar to Aave V3, combining several collateral and borrowing assets inside one venue. V4 also supports segregated markets with independent risk profiles, as well as segregated markets that use credit lines.
That last category is where Aave places special emphasis. It keeps risk separation intact while adding access to shared liquidity. According to the protocol, this setup may be especially useful for real-world asset markets, where early liquidity often needs to be bootstrapped but exposure across asset classes must remain tightly controlled. The examples named by Aave include equities, private credit, and alternative funds.
Prime, Core, and Plus Hubs create risk tiers
Aave also said operators will be able to deploy multiple Hubs, including Prime, Core, and Plus markets, to form different risk tiers across the ecosystem. That points to a system not built around one universal pool, but around modular liquidity centers serving different classes of borrowers and collateral profiles.
From the details released so far, V4 is less about simply making lending bigger and more about redesigning how onchain credit is arranged: where liquidity sits, where borrowing happens, which exposures are capped, and which markets can still draw from shared capital. The problem Aave is trying to solve is familiar across DeFi lending—capital efficiency and risk isolation rarely peak at the same time.