When you browse vaults on DeFi platforms, the APY number is often the first thing that catches your eye. It looks simple, bold, and promising—sometimes unbelievably promising. But those shiny percentages rarely tell the whole story. In fact, many investors misunderstand what APY actually represents, how it changes over time, and what risks or limitations sit beneath the surface.
This guide breaks down exactly how to read APYs on vaults, why those numbers can be misleading, and what to look for before you deposit a single dollar.
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What APY Actually Means (And Why It’s Not What You Think)
APY, or Annual Percentage Yield, is the projected rate of return you’d earn over one year if the current rate of rewards remains constant and if the vault compounds your returns exactly at the pace assumed in its formula.
But here is the catch:
In DeFi, APY is almost always a snapshot, not a guarantee. The rate you see today may look nothing like the rate you’ll experience over the next 12 months.
Most vaults calculate APY as:
Current Reward Rate × Compounding Frequency × Token Price Assumptions
That means even a slight change in any of these variables can shift the actual return dramatically.
Why Vault APYs Are Often Misleading
1. APYs Change Constantly
Reward emissions fluctuate. Token prices move. Fees shift. Liquidity conditions evolve.
Yet APY usually assumes today’s conditions will exist for the next year. That never happens.
In high-yield vaults, APYs can swing by:
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20% in one day
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200% in one week
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2,000% in one hour (during launch or hype events)
2. APY Often Doesn’t Account for Token Price Risk
Many vaults pay rewards in a token that also fluctuates in value.
If the reward token drops 40%, your real return drops with it—even if the APY number stays high.
A vault promising 200% APY may actually lose you money when priced in stable assets.
3. APY Doesn’t Reflect Impermanent Loss
If you’re in a liquidity pool vault—especially ones involving a volatile token—impermanent loss can eat into your earnings faster than APY can compensate for.
APY ≠ net profit.
4. APY Doesn’t Include Exit Fees, Harvest Fees, or Performance Fees
Many vaults apply:
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Withdrawal fees
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Harvest fees
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Protocol performance fees
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Gas fees on manual actions
The APY number rarely includes these.
Your real return can be significantly lower after fees.
5. APY Doesn’t Tell You Whether the Yield is Sustainable
A vault offering 10,000% APY may simply be distributing newly printed tokens.
This is not yield. This is dilution.
High APYs can often signal:
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Short-term incentives
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Unsustainable tokenomics
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Low liquidity
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Farm-and-dump behavior
How to Read APYs on Vaults the Right Way
Here is a simple framework for analyzing APY that keeps you grounded in reality.
1. Check the Compounding Frequency
Vaults may quote APY, but the underlying reward rate might be APR (simple interest) converted into APY (compound interest).
If a vault compounds:
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hourly → higher APY
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daily → moderate APY
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weekly → lower APY
Some platforms quote APY even when your rewards don’t auto-compound at all.
Always confirm compounding frequency.
2. Identify the Reward Token(s)
Ask:
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What token am I being rewarded in?
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Is it stable or volatile?
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Does it have real utility or only inflation-based incentives?
A vault paying in a fast-diluting governance token may have high APY but poor long-term value.
3. Analyze the Sustainability of Yield
Look for:
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Emission schedules
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Liquidity mining durations
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Governance votes that may reduce rewards
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Protocol revenue used to pay yield
Sustainable APY comes from real revenue—not inflation.
4. Look at Historic APY Ranges
Check the APY over:
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24 hours
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7 days
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30 days
If the APY is volatile, use a conservative average rather than the current posted number.
5. Examine Fees
Scan the vault details and documentation for:
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Management fee
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Performance fee
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Withdrawal fee
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Gas or harvest costs
Subtract these from your projected returns.
6. Check Token Price Correlation
The more volatile the reward token, the more likely your real return differs from the APY.
If the APY is in a token that fluctuates wildly, treat the number as a reference point—not a guaranteed yield.
7. Evaluate the Risk of Impermanent Loss
For LP vaults:
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Consider the volatility of the token pair
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Estimate IL based on historical price swings
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Understand that IL can exceed your APY
Higher APYs usually exist because the risk of IL is higher.
What the APY Number Truly Represents
Most DeFi APY numbers tell you:
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This is the current rate at which rewards are being emitted
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If nothing changes for one full year…
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And if your rewards compound at a certain pace…
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Then theoretically you could earn this return
What APY does not tell you:
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The volatility of token prices
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The sustainability of rewards
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Your net yield after fees
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The risk of the vault
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The historical average
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The realistic expected return
APY is a marketing metric more than a performance forecast.
Realistic Ways to Interpret Vault APYs
Here is a practical way to adjust the number based on risk:
If APY is 5–20%
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Likely conservative
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Based on stablecoin lending or protocol revenue
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Usually sustainable
If APY is 20–200%
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Based on token incentives
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Moderate volatility
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Requires closer monitoring
If APY is 200–2,000%
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Highly speculative
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Short-term opportunity
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High token inflation or low liquidity
If APY is above 5,000%
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Not sustainable
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High dilution risk
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Likely farm-and-dump territory
Treat any APY above 200% as temporary unless proven otherwise.
How to Calculate Your Real Expected Return
To get a more accurate sense of your actual return, consider:
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Reward token price changes
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Your compounding frequency
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Platform fees
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Gas costs (if applicable)
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Impermanent loss (if using LPs)
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How long you plan to stay in the vault
Instead of relying on APY, calculate your effective yield over the period you actually stay invested.
Most vault users don’t stay a full year—and most APYs don’t stay stable for a full year.
The Bottom Line: APY Is a Starting Point, Not a Decision Metric
APY is useful for quick comparisons, but it is not a reliable predictor of real returns.
To evaluate a vault, look beyond the headline APY and focus on:
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Rewards token quality
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Sustainability of emissions
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Historical APY stability
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Fees
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Risks specific to the vault
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Your investment timeline
When you understand what APY does and does not tell you, you make smarter decisions, avoid hype-driven traps, and capture yield that actually holds value over time.
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About the Author: Alex Assoune
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