DeFi lending looks diversified. It isn’t.

On the surface, lending markets support dozens of assets. In practice, most of the system is backed by a very narrow base. And that base defines how risk propagates.
DeFi lending remains one of the largest sectors in crypto, with roughly $30B–$35B in total TVL, dominated by @Aave, @compoundfinance, and @SkyEcosystem. But the key question isn’t size. It’s what actually backs the loans.
Across protocols, collateral clusters into a few categories:
➝ $ETH and $ETH derivatives
➝ Stablecoins
➝ Liquid staking tokens (LSTs)
That’s effectively the entire system. And the distribution is not balanced.
$ETH and ETH-derived assets dominate. On Aave, $ETH + LSTs often make up 40–60%+ of total collateral. LSTs like $stETH, $rETH, and $cbETH are growing quickly, but they don’t diversify risk. They reinforce it.
Stablecoins appear to add balance, but they introduce a different layer of fragility:
➝ Depeg risk
➝ Issuer dependency
➝ Liquidity fragmentation
They reduce volatility, but not systemic exposure.
At the protocol level, the pattern repeats:
➝ Aave is heavily concentrated in $ETH, $stETH, and $USDC.
➝ Compound leans on $ETH, $USDC, and $WBTC.
➝ SKY introduces RWAs, but $ETH remains central to the system.
Different assets. Same dependency.
This leads to a structural reality: DeFi lending is highly correlated. Not because assets are identical, but because they are economically linked.
In stress scenarios, the system behaves reflexively. $ETH drops, LSTs follow, collateral values compress, liquidations trigger, and selling pressure accelerates. Risk doesn’t stay isolated. It moves through the system at once.
The implication is straightforward. System stability depends on a few variables: $ETH price behavior, LST liquidity, and stablecoin stability. Not the number of assets supported.
Diversification is improving, but still early. RWAs are growing, especially in SKY, but relative to $ETH dominance they are not yet system-defining.
What matters going forward is clear. LST share continues to increase. Leverage cycles are expanding. Collateral remains correlated.
Which means collateral composition is becoming a first-order risk variable.
DeFi lending isn’t defined by how many assets it supports. It’s defined by which assets actually carry the system. And right now, that weight is still heavily concentrated.