Is DeFi lending (Aave, Compound) halal?

DeFi lending platforms let you deposit crypto to earn a yield, or borrow against collateral for a fee. Stripped of the technology, that yield and that fee are interest, and interest is the single clearest prohibition in Islamic finance.

Why it is riba, plainly

Riba is any predetermined increase paid for the use of money over time. When you supply a stablecoin to Aave and the protocol pays you a percentage, you are being paid for lending money. When you borrow and pay a percentage, you are paying for the use of money. The fact that a smart contract, rather than a bank, sets the rate changes nothing about its nature. The prohibition is on the substance, not the middleman.

The common objections, answered

Some argue the rate is variable, so it is not fixed interest. But riba does not require a fixed rate; a floating interest rate is still interest. Others say it is a fee for a service, not a loan. Yet the service is precisely the lending of money for a return, which is what the prohibition targets. A few point to over-collateralization as making it safer, but safety is not the issue, the interest is.

What about providing liquidity?

Supplying assets to a decentralized exchange to earn a share of trading fees is a genuinely different question, because the reward is a share of fees from real exchange activity rather than interest on a loan. It carries its own concerns, impermanent loss, and whether any pooled asset is itself impermissible, but it is not automatically riba the way lending is. The two are often confused.

The takeaway

Protocols whose core function is interest-based lending, Aave, Compound and their peers, are viewed by most scholars as impermissible to earn from, which is why their tokens carry our "concerns" status. If you hold such a token, understand that it is using the lending feature that is the problematic act. See the halal framework. Education, not a fatwa.