Yield farming involves deploying crypto assets into decentralized finance (DeFi) protocols — liquidity pools, lending markets, or governance vaults — in exchange for yield paid in tokens.
At its peak in 2020–2021, some farms advertised thousands of percent APY. Most of those yields collapsed quickly. Understanding *why* separates sustainable yield from value destruction.
Trading fees: When you provide liquidity to a DEX (e.g., Uniswap, Curve), you earn a share of fees from every swap in your pool. This is the most sustainable yield source.
Lending interest: Protocols like Aave pay depositors from borrower interest. Rates fluctuate with utilization.
Token emissions: Protocols distribute governance tokens to attract liquidity. This yield is only real if the token retains value — many don't.
Impermanent loss: When you provide two assets to a liquidity pool and their prices diverge, you end up with less value than if you'd simply held. In volatile pairs (e.g., ETH/ALT), this can wipe out fee income entirely.
Smart contract risk: Every protocol is a target. Billions have been lost to exploits, rug pulls, and misconfigured contracts.
Token dilution: Farming rewards paid in a protocol's own token often collapse in value as emissions outpace demand.
Liquidation risk: Leveraged yield strategies can be liquidated instantly in volatile markets.
If the APY looks extraordinary and you can't explain exactly where the yield comes from, treat it as speculative capital — size it accordingly.
DeFi yield farming is not inherently dangerous, but undisciplined participation is. Stick to audited protocols, understand the yield source, and never deploy more than you can afford to lose to a smart contract failure.