Crypto Lending: Who Lends, Who Borrows, and Why

The phrase "crypto lending" hides three businesses that share almost nothing except a name. In one, a retail depositor supplies stablecoins to a smart contract and earns yield from strangers who over-collateralize their loans. In another, a market maker borrows from a centralized desk to fund a hedge. In a third, an institution posts tokenized Treasuries as collateral in a repo-style trade. Same word, three different sets of counterparties, and three very different answers to the only question that matters when a loan goes bad: who is holding the collateral, and who is on the hook.

Crypto lending is the practice of lending and borrowing digital assets, either through automated smart contracts (DeFi lending) or through a centralized company (CeFi lending), usually secured by collateral that can be seized if the borrower defaults. The mechanics, the custody arrangement, and the recourse differ sharply depending on which side of the market you are on.

Key takeaways

• Most onchain crypto lending is overcollateralized: borrowers post more value than they take out, so the protocol can liquidate the position automatically if prices move against them.
• The three sides of the market want different things. Retail depositors want passive yield, market makers want borrowed inventory to hedge or arbitrage, and institutions want to finance tokenized collateral without moving cash.
• Custody is the fault line. In DeFi lending a smart contract holds the collateral; in CeFi lending a company does; in tokenized repo a custodian or clearing arrangement does. When something breaks, that difference decides your recourse.
• Liquidation in DeFi is automatic and public. In CeFi it is discretionary and private, which is why several CeFi lenders failed in 2022 while major DeFi protocols kept processing loans.

Why the same word covers three markets

The cleanest way to understand crypto lending is to stop treating it as one product and ask who is standing on each side of the loan.

Retail depositors: passive suppliers of liquidity

On overcollateralized DeFi protocols such as Aave, depositors supply assets into a pooled smart contract and earn a variable interest rate paid by borrowers. Based on lending activity recorded onchain, supply and borrow rates float algorithmically with utilization: the more of a pool that is borrowed, the higher the rate climbs to attract new deposits and ration demand. Aave's own documentation describes this pool model, where suppliers receive interest-bearing tokens representing their claim. The depositor never negotiates with a borrower and never chooses one. They are lending to a pool, and the pool's collateral rules are their only protection.

Market makers: borrowing to hedge and arbitrage

Professional trading firms are among the largest borrowers in crypto. A market maker might borrow a token to short it as a hedge, or borrow stablecoins to fund a delta-neutral position, or move borrowed inventory between venues to capture a spread. Speed and reliability matter more to them than the headline rate, because the loan is a tool inside a larger trade. They borrow both onchain, where liquidation is transparent and they can model it precisely, and from centralized desks, where terms can be negotiated and margined bilaterally.

Institutions: financing tokenized collateral

The newest side of the market is institutions using tokenized real-world assets as collateral. Instead of selling a Treasury position to raise cash, an institution can post a tokenized version of it and borrow against it, closer to a repo trade than to a retail deposit. This is where securities lending for tokenized securities starts to look like traditional finance plumbing rebuilt onchain, and it is why payment networks are paying attention. Visa has publicly described its intent to build the rails for lending in what it calls onchain finance.

How an overcollateralized loan works, step by step

The dominant model onchain is overcollateralization. Here is the full lifecycle of a single borrow, using round numbers to make the mechanics concrete.

1. Deposit collateral. You supply $10,000 of ETH to a lending protocol.
2. Check the loan-to-value limit. Suppose the protocol allows borrowing up to 75% of your collateral value. Your maximum borrow is $7,500.
3. Borrow conservatively. You borrow $5,000 in a stablecoin, leaving a buffer. Your loan-to-value is 50%.
4. Interest accrues. You pay a variable borrow rate; suppliers on the other side earn most of it, with a slice going to the protocol reserve.
5. Prices move. If ETH falls and your collateral drops toward the liquidation threshold, your position becomes eligible for liquidation.
6. Liquidation. A liquidator repays part of your debt and takes a portion of your collateral plus a bonus. The transaction is public and permissionless.

The table below shows what the buffer means in practice. Assume a $10,000 ETH deposit and an 80% liquidation threshold, meaning liquidation triggers when your debt exceeds 80% of current collateral value.

The lesson every borrower learns: the closer you borrow to the maximum, the smaller the price move that wipes you out. Retail depositors on the supply side benefit from these liquidations because they keep the pool solvent, which is the entire safety design.

DeFi, CeFi and tokenized repo, side by side

The custody, liquidation and counterparty differences are the whole story. This table lays them out.

The 2022 failures make the contrast tangible. Several centralized lenders collapsed because borrowers could not repay and the lenders had rehypothecated customer collateral in ways depositors could not see. Overcollateralized DeFi protocols, meanwhile, kept liquidating positions on schedule because the rules were enforced by code and the collateral was visible to everyone. That does not make DeFi safe; it makes its failure modes different and observable.

What each side actually gains

• Faster access to liquidity: a borrower posts collateral and receives funds in one transaction, with no application, no underwriting, and no waiting for a business day to settle.
• Yield without picking counterparties: a retail depositor earns interest from a diversified pool of borrowers rather than lending to one named party and hoping they repay.
• Capital that stays put: an institution can borrow against tokenized Treasuries without selling them, so it keeps the underlying yield while raising cash against the position.
• Liquidation you can model: a market maker can see the exact price at which a position gets liquidated and size the trade around it, instead of waiting on a margin call from a desk.

Why stablecoins turned lending into infrastructure

Most onchain borrowing and lending is denominated in stablecoins, which is why the two topics are inseparable. A stablecoin borrower knows their debt will not swing in dollar terms, and a stablecoin depositor earns a rate they can compare to money-market yields. Visa's research, produced with Allium, examined this directly in stablecoins beyond payments and the onchain lending opportunity, framing lending as the next major use of stablecoins after payments.

The measurement problem underneath all of this

Comparing these three markets is harder than it sounds, because they do not describe themselves the same way. A DeFi liquidation, a CeFi loan drawdown, and a tokenized-repo margin adjustment are recorded as completely different events, and even within DeFi, a borrow on one protocol and a borrow on another emit different contract logs, different token representations, and different collateral accounting. To answer a question as basic as "how much stablecoin debt is outstanding across lending markets, and against what collateral," every one of those records has to resolve to the same fields: protocol, borrower, collateral asset, borrowed asset, amount, USD value, and event type, across the many chains where lending happens. Allium ingests raw data from 150+ blockchains and standardizes it into lending datasets so that a borrow on one venue and a borrow on another become comparable rows rather than incompatible logs.

Risks and open questions

Smart contract risk is real. DeFi lending removes the company but replaces it with code. A bug or an exploit can drain a pool, and the depositor's recourse is limited because the code ran as written.

Oracle risk sits under every liquidation. Protocols rely on price feeds to decide when to liquidate. If a feed is manipulated or stale, liquidations can fire wrongly or fail to fire at all.

CeFi opacity remains the hardest problem. A centralized lender's balance sheet is only as trustworthy as its disclosures. Rehypothecation you cannot see is the exact risk that took down several lenders.

Tokenized collateral is early. The legal enforceability of a claim on tokenized real-world assets across jurisdictions is still being tested, and the custody arrangements vary by issuer. A critique of one such report argued it understated parts of the DeFi lending picture, a reminder that even careful analyses of this market disagree on what to count.

Rates are not risk-free. A high supply yield usually reflects high borrow demand, and high demand often means someone is taking a leveraged bet. The yield and the risk move together.

Frequently asked questions

Is crypto lending safe?

It depends entirely on which type. Overcollateralized DeFi lending carries smart contract and oracle risk but enforces liquidations transparently and non-custodially. CeFi lending carries the credit risk of the company holding your assets, which is what caused several high-profile failures in 2022. Tokenized-collateral arrangements add custodian and legal-enforceability risk. There is no single answer because the counterparties and custody differ across the three markets.

What does overcollateralized mean in crypto lending?

It means a borrower must post more collateral than they borrow. For example, depositing $10,000 of ETH to borrow $5,000 in stablecoins. The extra buffer lets the protocol liquidate the position automatically if prices fall, protecting the depositors who supplied the borrowed funds. Most onchain lending works this way because there is no credit check on an anonymous borrower.

How is DeFi lending different from CeFi lending?

In DeFi lending a smart contract holds the collateral and enforces the loan rules automatically, and every position is visible onchain. In CeFi lending a centralized company holds your assets, sets terms, and can rehypothecate collateral in ways you may not see. The core difference is custody and transparency: code versus a company, public versus opaque.

Who borrows in crypto lending markets?

Three main groups. Retail users borrow against holdings to raise cash without selling. Market makers and trading firms borrow inventory to hedge, short, or arbitrage between venues. Institutions increasingly borrow against tokenized real-world assets such as Treasuries, in trades that resemble traditional repo. Each group prioritizes different things, from passive yield to execution speed to capital efficiency.

How do lenders earn yield in crypto lending?

Depositors supply assets into a pool and earn interest paid by borrowers. The rate is usually variable and rises with utilization, meaning the more of the pool that is borrowed, the higher the rate. A slice typically goes to a protocol reserve. Because yield tracks borrow demand, a high rate often signals high leverage demand rather than free money.

What happens when a crypto loan gets liquidated?

When a borrower's collateral falls below the required threshold, the position becomes eligible for liquidation. In DeFi, a liquidator repays part of the debt and receives a portion of the collateral plus a bonus, and the transaction is public and permissionless. In CeFi, liquidation is handled privately at the company's discretion. Liquidation is what keeps the pool solvent for depositors.