Decentralized finance protocols make money by charging fees for automated financial services, and the crucial question for any analyst is not just what fee is charged but who collects it. An academic survey of DeFi business models groups the leading protocols into three categories—Protocols for Loanable Funds, decentralized exchanges, and yield aggregators—each with a distinct revenue source and a distinct set of beneficiaries. The dividing line that matters most runs between liquidity providers, who supply the assets that make the machinery work, and governance token holders, who may or may not receive a share of the cash flows.
Introduction to DeFi Economic Models
The survey, which examines the business models of various DeFi protocol types, maps each category onto a consistent structure: a smart contract, an investor, a user, and the financial service being sold. In Protocols for Loanable Funds, the smart contract is a lending pool, the investor is a lender, the user is a borrower, and the service is a loan. In decentralized exchanges, the contract is a liquidity pool, the investor is a liquidity provider, the user is a trader, and the service is an exchange. Yield aggregators substitute a vault, a vault user, and asset management.
This abstraction matters because it makes the revenue question comparable across protocol types. Every model sells a service, charges for it, and distributes the proceeds—but the recipient differs. As Chainlink's analysis of real yield explains, mature protocols distribute actual earnings, such as trading fees or lending interest, to liquidity providers and token holders, while typically retaining a portion for a treasury or development fund to ensure ongoing maintenance and upgrades.
Protocols for Loanable Funds (PLFs): Lending and Borrowing
Lending protocols generate revenue from the interest that borrowers pay. Compound, a money market protocol profiled in the Wharton School's report on DeFi, lets users instantly lend to or borrow from a pool of assets held in a smart contract. The interest earned is denominated in the same token that is lent, and interest rates are algorithmically derived as a function of the assets available in each market, reflecting supply and demand for each asset.
The primary value recipients are the lenders, who receive that interest on their supplied assets. Pyth Network's overview of DeFi revenue adds a structural detail: lending protocols generate revenue by extracting a few basis points between the borrow and lending rates, and that spread is distributed to both the liquidity provider and the protocol itself. Compound illustrates a second distribution channel—its COMP token popularized "liquidity mining," in which a predetermined amount of COMP is distributed to all lenders and borrowers every day, giving token issuance itself a role in value distribution.
Decentralized Exchanges (DEXs): Facilitating Peer-to-Peer Trading
Decentralized exchanges allow users to trade cryptocurrencies directly through automated market makers, eliminating the need for a centralized intermediary. Their revenue comes from transaction fees charged on trades. Uniswap, a leading decentralized exchange, charges a 0.3% fee on trades, according to Pyth Network's account, which notes that this both incentivizes liquidity providers and funds platform development.
The Wharton report describes the mechanism: buying tokens removes them from the liquidity pool, causing their price to increase to maintain the constant, and Uniswap charges a trading fee, part of which is distributed to liquidity providers. From launch in November 2018 to the end of 2020, Uniswap facilitated over $100 billion in trading volume. Liquidity providers' claims are typically tracked through LP tokens, which, as a Congressional Research Service report explains, function as receipts identifying holders as having provided liquidity and entitling them to fees, interest, the right to redeem the cryptocurrency, or some combination thereof.
Yield Aggregators: Optimizing Returns Across Protocols
Yield aggregators occupy the third business model: they automatically move users' funds between different DeFi protocols to maximize returns, optimizing yield generation strategies rather than providing a single service themselves. Yearn Finance, cited in the Wharton report as an example, optimizes returns from liquidity and collateral provision.
Their revenue mechanism is a performance fee—a percentage of the profits earned from optimizing strategies. This makes the aggregator model the most direct of the three: the protocol's income is explicitly tied to how much additional yield it can capture for users, and the vault user receives the remainder. The aggregator does not replace lending platforms or exchanges; it sits on top of them, routing capital to wherever the combined incentives are strongest.
Comparative Framework of DeFi Economic Models
The table below applies the academic framework to the three business models, identifying each one's primary service, revenue source, and who actually receives the value. Use it to evaluate a protocol by locating its revenue source first, then tracing where the cash flow ends up.
| Protocol Type | Primary Service | Revenue Source | Primary Value Recipient |
|---|---|---|---|
| Protocols for Loanable Funds (PLFs) | Lending and borrowing of crypto assets without intermediaries, via pooled smart contracts | Interest paid by borrowers, with the protocol extracting a few basis points between borrow and lending rates | Lenders, who receive interest denominated in the same token lent; rates are algorithmically set by supply and demand |
| Decentralized Exchanges (DEXs) | Direct peer-to-peer trading through automated market makers, eliminating centralized intermediaries | Transaction fees on trades—Uniswap, for example, charges 0.3% | Liquidity providers, who receive the trading fees for supplying assets to pools, tracked via LP tokens |
| Yield Aggregators | Automatically moving users' funds between protocols to maximize returns | Performance fees—a percentage of the profits earned from optimizing strategies | Vault users, who keep the optimized yield net of the performance fee |
The comparison shows that in the lending and exchange models, the value recipient is the party supplying the capital—lenders and liquidity providers respectively—while the protocol's own take is a spread or a share of fees. The aggregator model inverts this: the protocol's fee is explicitly a cut of user profits.
Value Accrual: Liquidity Providers vs. Governance Token Holders
Within any single model, protocols differ sharply on whether governance token holders receive anything beyond voting rights. The clearest contrast is Uniswap and SushiSwap. In mid-2020, an anonymous developer forked the Uniswap software to create SushiSwap, adding a governance token, SUSHI, with which the community votes on major protocol changes. Crucially, a portion of trading fees across the SushiSwap platform is paid out to SUSHI token holders, and the Wharton report attributes SushiSwap's substantial early interest directly to that potential for value accrual.
Uniswap subsequently created its own UNI governance token, but the report is explicit about the difference: Uniswap's cash flows did not yet accrue to UNI token holders, though the protocol had announced plans to change that. Governance tokens can also carry value through control rather than cash flow—MakerDAO's MKR token, one of the earliest examples, entitles each holder to one vote on the protocol that issues the DAI stablecoin. The distinction between a token that earns fees and a token that only votes is the single most consequential line in DeFi tokenomics.
Understanding Real Yield and Incentives
Chainlink frames these distribution choices as an industry-wide shift toward what it calls real yield: distributing actual protocol earnings—trading fees or lending interest—to liquidity providers and token holders rather than relying solely on token emissions. In this model, every swap charges a small percentage of the transaction, borrowers pay interest that forms the basis of depositor yield, and smart contracts automate the distribution, with the protocol typically retaining a portion for a treasury or development fund.
The claimed benefit is incentive alignment: participants earn from genuine usage rather than from newly minted tokens, which Chainlink argues establishes a foundation for long-term growth. For an analyst, real yield is also a screening criterion. A protocol whose payouts to token holders come from fee revenue has a legible business model; one whose payouts depend on emissions does not.
Evaluating DeFi Protocol Value Accrual
When evaluating a DeFi protocol, investors should analyze its core business model to understand its primary revenue generation mechanism and how that value is distributed among liquidity providers and governance token holders. The Uniswap–SushiSwap comparison shows that two protocols with nearly identical mechanics can differ completely in who captures the cash flow, and that a governance token's value depends on whether fees actually accrue to it.
The measurable indicator is the protocol's whitepaper or official documentation detailing its fee structure and tokenomics, specifically identifying if and how governance token holders receive a share of protocol revenue. That single document answers the question the market price often cannot: whether the token is a claim on cash flows or only a ballot.
