What Is Yield Farming and How Does It Actually Work?

Yield farming is the practice of moving crypto assets between DeFi protocols to earn returns, often chasing the highest advertised rate. The eye-catching percentages can be real, but they come from specific mechanisms with specific risks. If you understand where the yield originates, you can tell a durable return from a temporary subsidy. This guide unpacks the sources of yield and the numbers used to describe them.

Where does DeFi yield actually come from?

Yield is not created from nothing. In DeFi it flows from a handful of identifiable sources, and every farm is some combination of these:

• Trading fees: providing liquidity to a DEX pool earns a share of the swap fees traders pay, as covered in AMM mechanics.
• Borrowing interest: lending assets into a money market earns the interest borrowers pay, set by utilization.
• Token incentives: a protocol prints its own governance token and hands it to users who supply liquidity. This is liquidity mining.
• Staking rewards: some yield reflects underlying protocol rewards passed through to depositors.

The first two are organic; they exist because someone on the other side is paying for a service. The third is a marketing budget. A protocol emits tokens to bootstrap usage, effectively paying you to show up. That yield lasts only as long as emissions do, and it dilutes existing holders. Distinguishing organic fee yield from subsidized token yield is the single most useful skill in farming.

What is the difference between APR and APY?

Farms advertise returns as APR or APY, and confusing them leads to disappointment.

APR is the simple annual rate with no compounding. APY includes the effect of reinvesting your returns over the year.

If a farm pays 1% per month and you never reinvest, that is roughly 12% APR. If you harvest and redeposit your rewards each month so they start earning too, compounding lifts the effective figure to about 12.7% APY. The gap widens dramatically at high rates and frequent compounding, which is why some dashboards show enormous APY numbers that assume you compound many times a day. Those figures are arithmetically valid but assume constant rates and ignore gas costs, so treat them as a ceiling, not a promise.

How does a typical yield farm work step by step?

A common farming loop looks like this:

• Provide liquidity: deposit a token pair into a DEX pool and receive LP tokens representing your share.
• Stake the LP tokens: deposit those LP tokens into the protocol's farm contract.
• Earn rewards: accumulate the protocol's governance token on top of the underlying trading fees.
• Harvest and compound: periodically claim the reward tokens, sell or reinvest them, and repeat.

Your total return is therefore trading fees plus emitted tokens, minus impermanent loss on the pair and minus transaction costs. That last point matters: on high-fee networks, frequent harvesting can erase the benefit of compounding, which is why autocompounding vaults exist to batch these actions efficiently.

Why do sky-high yields rarely last?

A farm advertising 300% APY is almost always paying in a freshly minted token. Several forces pull that rate down fast:

• More farmers arrive: the same emissions are split across more capital, so the per-user rate falls.
• Token price drops: farmers who sell their rewards for stable assets create constant sell pressure, lowering the token's value and therefore the real yield.
• Emissions taper: most schedules reduce token issuance over time by design.

This dynamic is sometimes called mercenary capital: liquidity that arrives for the incentive and leaves the moment a better one appears elsewhere, leaving the protocol thinner than before. High yield is often the market's way of pricing high risk or high dilution, not a free lunch.

What risks should farmers weigh?

Beyond diminishing returns, yield farming stacks risks on top of each other. You inherit the smart-contract risk of every protocol in the loop, so a farm built on a DEX plus a vault plus a bridge carries all three failure surfaces. Impermanent loss can quietly outweigh fees on volatile pairs. Reward tokens may be illiquid or crash on sale. And newer or unaudited contracts carry a real chance of exploits or outright rug pulls. The sensible approach is to read where the yield comes from, discount subsidized emissions heavily, and never assume an advertised APY is what you will actually keep. This is educational information, not financial advice.