"Yield farming" sounds like a single strategy. It's really an umbrella term for moving crypto assets between DeFi protocols to earn the best available return — and understanding where that return actually comes from is the difference between farming sustainably and chasing a number that's about to collapse.

Where the yield actually comes from

Every yield farming return traces back to one of a few real sources:

  • Trading fees — a share of the fees paid by traders using a liquidity pool you've deposited into.
  • Lending interest — interest paid by borrowers on a lending protocol, funded by their collateral and demand for borrowing.
  • Token incentives — newly issued governance or protocol tokens paid out to attract liquidity, on top of (or instead of) the "real" yield above.

The first two are backed by genuine economic activity. The third is where most unsustainably high yields come from — a protocol can advertise a large percentage return simply by emitting more of its own token, which only holds value if there's enough ongoing demand to absorb it.

A basic yield farming loop

A simple version looks like: deposit two tokens into a liquidity pool, receive LP tokens representing your share, then stake those LP tokens in a separate rewards contract to earn a bonus token on top of ordinary trading fees. More complex strategies stack several of these steps — sometimes across multiple protocols and chains — to compound returns further, which also compounds the number of things that can go wrong.

The real risks

  • Smart contract risk: Every additional protocol in your strategy is another piece of code that could contain a bug or be exploited.
  • Impermanent loss: If your yield involves a liquidity pool, the underlying token price movements can erode returns — see our guide to how liquidity pools work for the mechanics.
  • Token emission risk: A high advertised APY funded mostly by token emissions can collapse quickly if the token's price falls as more of it enters circulation.
  • Composability risk: Strategies that route funds through several protocols inherit the risk of every protocol in the chain, not just the last one.

How to sanity-check a yield before farming it

Ask where the number is actually coming from. A yield backed mostly by real trading or lending activity, on an audited protocol with meaningful total value locked, is a fundamentally different risk profile than a new pool advertising triple-digit returns funded by its own token emissions. The higher and newer the advertised yield, the more scrutiny it deserves — not less.

The takeaway

Yield farming isn't inherently risky or inherently safe — it's a spectrum determined by where the yield comes from and how many protocols your funds pass through to earn it. Understanding the source of the yield is the single most useful habit for evaluating any farming opportunity.