What Is Yield Farming? How DeFi Rewards Actually Work

Ask ten DeFi users what yield farming is and you will get ten confident answers that do not quite match. The phrase has been stretched to cover lending rewards, staking bonuses, points programmes and token emissions that may or may not be worth something later. What the versions share is a simple idea: you park capital in a protocol, and the protocol pays you for keeping it there, usually in its own token.

That last detail is the one that matters. A reward paid in a new token is not the same thing as interest paid in dollars, and the difference between farming and gambling usually comes down to whether you checked where the yield was coming from.

How the term started

Yield farming grew out of a specific mechanism called liquidity mining. In June 2020 the lending protocol Compound started distributing its COMP governance token to the people who supplied assets to it and to the people who borrowed, at a rate of roughly 2,880 COMP a day. Borrowing, briefly, paid you. Users responded by looping deposits and loans to maximise the token stream, and the pattern spread across DeFi within weeks. That period is now remembered as DeFi Summer.

The agricultural language stuck because the routine felt like planting: put capital in, wait, harvest the rewards, replant. SushiSwap ran the same play later in 2020, rewarding people who staked exchange pool tokens with SUSHI, and pulled a large share of Uniswap's liquidity across in the process. The mechanism was new. The incentive was not: pay people in a token you issue yourself, and you can rent their capital for as long as the token holds value.

What yield farming actually is

Strip away the branding and yield farming comes down to this. You deposit a crypto asset into a smart contract. The contract pays you a reward for as long as your capital stays there. The reward might be interest from borrowers, a share of trading fees, a governance token, or some combination of all three.

Most farms take one of three shapes. The simplest is supplying to a money market, where you deposit a stablecoin or ETH and earn the borrow rate plus, often, a token bonus on top. The second is providing liquidity to an automated market maker, which means depositing two assets into a pool so traders can swap against them; you earn a slice of every trade, and you can usually stake the receipt token you get back in a separate farm for extra rewards. The third is staking a liquid staking or receipt token, where the underlying asset keeps earning while the receipt earns again on top.

Crypto farming sites dress these up differently, with tiers, boosters and multipliers, but the underlying trade is always the same: your capital in exchange for a stream of rewards.

Where the yield is really coming from

Before depositing anything, trace the reward to its source. There are only three.

Real revenue: trading fees, borrow interest, or liquidation income that the protocol actually collects from users. This yield exists because somebody paid for a service. It can shrink in quiet markets, but it does not depend on a token price.

Token inflation: the protocol mints new tokens and hands them to depositors. This is the most common source in a young farm, and the honest way to read it is as a subsidy. The protocol is buying liquidity with future supply. Your reward is real, but its value depends entirely on what the market will pay for the token once you sell it, and everyone else in the farm is selling too.

Points and promises: some programmes hand out non-transferable points that may convert to a token at an unspecified date. That is a bet on a future announcement, not a yield. Treat it as such.

If you cannot tell which of the three you are being paid from, the APY on the page is marketing rather than information.

Why the headline APY misleads

The number in the big font is usually computed from the reward rate at today's token price, annualised, and compounded on the assumption that nothing changes. Three things break that assumption.

First, emissions get cut. Most protocols reduce reward rates over time, sometimes by governance vote, sometimes on a fixed schedule. A 60% rate in month one can be 6% by month nine.

Second, the token price moves. If you are paid in a token that halves, the dollar value of your rewards halves with it, no matter what the percentage says. Farmers who never sell are long the token whether they meant to be or not.

Third, your capital is not the only capital. When a farm looks profitable, more money arrives, and each depositor's share of a fixed emission falls. This is why early entrants earn far more than the people who arrive after a week of coverage.

A typical farm, step by step

The workflow is short, and every step has a cost worth knowing about.

You start with a self-custody wallet holding the assets you intend to use. You pick a pool and check that the pair makes sense to you, because you will hold both sides of it. You deposit, and the protocol gives you a receipt token representing your share, often called an LP token. You stake that receipt in the farm to earn the extra rewards. Every so often you harvest, which means claiming rewards and paying gas to do it. When you leave, you unwind the same steps in reverse.

Each action is a transaction, and each transaction is a fee plus a moment where a smart contract does exactly what its code says. Farm aggregators now bundle steps together, which is why crypto farming can look like one click on some sites while it is five transactions underneath. On a busy chain, the round trip of deposit, stake, harvest and withdraw can cost a meaningful slice of a small position. Farming with a few hundred dollars on an expensive network is often a donation to the gas market.

Impermanent loss, the cost inside the pool

Liquidity provision has a structural cost that has nothing to do with hacks or token prices. When the two assets in a pool change price relative to each other, the pool rebalances, and you end up holding more of the one that fell and less of the one that rose. Compared with simply holding both, you are usually worse off when the pair diverges, even though your fee income keeps accruing.

The effect is small for pairs that track each other closely and large for volatile pairs. It is covered in more detail in our guide to impermanent loss, which is worth reading before your first liquidity position. If you are new to how these pools work at all, start with the explainer on what a decentralized exchange actually does and come back.

What to check before you deposit

A short checklist filters out most of the bad farms.

Read the audit, and check who wrote it and when. An audit from three years and two upgrades ago tells you very little about today's code. Look at total value locked, then ask whether it is large because the farm is trusted or because the emissions are still high. Find the emission schedule, including any end date or halving. Check whether your deposit can be withdrawn at any time, or whether there is a lockup and a withdrawal fee that quietly belongs to the protocol. Look at how much liquidity the reward token has: a token you cannot sell without moving the price is not worth the number on the dashboard. And check who controls the contract, because an admin key that can change the rules is a risk you are accepting whether or not it is mentioned.

One more habit is worth building. If a farm needs a countdown timer, a Telegram group and a promise to feel urgent, the urgency is doing the work that due diligence should be doing.

The risks that never appear in the APY

Smart contract risk is the big one. A farm is code holding your money, and code has bugs; a single flaw in a widely used protocol can drain a pool in one transaction. Oracle risk comes next: prices for collateral and rewards usually arrive from outside the chain, and a manipulated feed can liquidate positions or misprice rewards. Stablecoin depegs turn a "risk-free" stable pool into a loss. Governance risk means the rules you agreed to can be changed by a vote. And exit risk is real: the moment a farm turns, everyone withdraws at once, gas spikes, and the pool you were in becomes difficult to leave at the price you expected.

There is also tax. Rewards claimed are usually income at the moment you receive them in most jurisdictions, even if you never sell and the token later falls. That is a paperwork problem today and a cash problem at filing time. Rules differ by country, so this is a conversation to have with a tax professional rather than a crypto forum.

Is yield farming worth it?

For some people, yes. If you already hold two assets you intend to keep, providing liquidity and collecting fees is a reasonable way to put them to work, provided you understand the pair and accept impermanent loss. If you are chasing a triple-digit number on a token you had never heard of last week, you are not farming a yield, you are buying the token with extra steps and paying gas for the privilege.

The useful habit is to ask what would have to be true for the reward to still be worth something in six months, then check whether those things are true now. Yield is a claim on somebody else's cash flow or on a token's future price. Knowing which one you hold makes the decision a lot less mysterious.