APY (Annual Percentage Yield) in crypto is the projected yearly return on a staking or DeFi position, including the effect of compounding. A 5% APY means if you leave your crypto staked for a full year and rewards compound, you end up with 5% more than you started. The key difference from traditional finance: crypto APYs are variable, often change daily, and carry risks that bank savings accounts do not.
What Is APY in Crypto (And How It Differs From Traditional Finance)?
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The short version
APY tells you "if things stay exactly as they are right now for a full year, here is what you will earn." In a bank, that number is stable and insured. In crypto, the number displayed today might be completely different tomorrow. That 50% APY you see on a new farm could be 5% next week once more people pile in, or zero if the protocol gets exploited.
How It Works
APY vs. APR: APR (Annual Percentage Rate) is simple interest, no compounding. APY includes compounding. If APR is 10% compounded daily: APY = (1 + 0.10/365)^365 - 1 = 10.52%. In crypto, claimed APY often assumes: constant token price (it rarely is), continuous compounding (requires active claiming and restaking), stable reward rate (which decreases as more people stake), and no protocol failures. Real yield (after accounting for token inflation): a protocol paying 20% APY in its own inflationary token while supply grows 15% gives you a real yield of roughly 5%. Always ask: "Where does the yield come from?" Sustainable sources: transaction fees, borrowing interest, MEV. Unsustainable sources: pure token emissions with no revenue backing them.
The difference between displayed APY and actual return
A DeFi farm shows "85% APY" for staking TOKEN-X. You deposit $10,000 worth. Reality check: (1) The APY is paid in TOKEN-X, which has 100% annual inflation. (2) More depositors arrive, diluting rewards. After one month, the APY drops to 30%. (3) TOKEN-X price falls 60% over the year due to sell pressure from reward emissions. Your math: you earned 45% more TOKEN-X units over the year (actual compound with variable rate), but TOKEN-X is worth 60% less. Net result: $10,000 became ~$5,800 in dollar terms despite earning "85% APY." Compare: staking ETH at 4% APY. You earn 4% more ETH, and if ETH price is stable, you actually have 4% more value. Lower headline number, higher actual outcome.
What People Get Wrong
Higher APY always means more profit
High APY in an inflationary token often means you are being paid in something that is losing value faster than you earn it. Always convert the projected yield into dollar terms and account for the token's price trajectory.
Crypto APY is guaranteed like a bank CD
Crypto APY is a projection based on current conditions, not a guarantee. Rates change constantly. There is no FDIC insurance, no regulatory backstop, and smart contract risk on top. Treat displayed APY as an estimate, not a promise.
Compounding happens automatically
On some protocols (Lido stETH, Aave interest) it does. On others (farming reward tokens), you must manually claim and restake to compound. Gas costs can eat into returns for small positions. Auto-compounding vaults (Yearn, Beefy) solve this but add another smart contract risk layer.
Keep Reading
Sources & Further Reading
- DefiLlama Yields
Compare real-time APY across thousands of DeFi pools with historical data
Questions People Also Ask
- What is a realistic sustainable APY in crypto?
- For established protocols on major assets: 2-8% is sustainable (backed by real fees and demand). Anything above 20% sustained on a major asset is unusual and worth questioning. New protocols can offer higher rates short-term via emissions, but these decay as more capital enters.
- How do I calculate real yield?
- Real yield = reward APY minus token inflation rate, adjusted for price change. Or more practically: track your position's dollar value over time and calculate the actual percentage change. The difference between "APY displayed" and "money actually made" is often startling.
- Where can I compare crypto yields?
- DefiLlama Yields page shows current APY across thousands of pools with historical data. DeFi Rate and Staking Rewards show staking yields by chain. Always cross-reference with the protocol documentation to understand where the yield comes from.