Understanding DeFi Yield, Yield Farming, and Aggregators

This lesson teaches you where yield comes from—and how to evaluate it properly.

Part 1: The Truth About Yield

Beginner Mindset

“DeFi gives high APY.”

Operator Mindset

“Who is paying me—and why?”

The Three Real Sources of Yield

There are only three real sources of yield in DeFi:

• Trading fees

• Borrowing interest

• Token incentives (emissions)

Key Insight

Part 2: Liquidity Providing (Earning Fees)

How It Works

You provide liquidity on protocols such as:

• Uniswap

• Curve Finance

What You Earn

• Trading fees

Every time someone swaps tokens, liquidity providers earn a portion of the fees.

The Tradeoff

• Income source: trading fees

• Main risk: impermanent loss

Key Insight

Part 3: Yield Farming (Token Incentives)

What Is Yield Farming?

Protocols reward users with extra tokens for providing liquidity or staking assets.

Example

You provide liquidity and earn:

• Trading fees

• Reward tokens

The Problem

Reward systems are often inflationary.

This means:

• More tokens are continuously printed

• Token prices can decline over time

Result

A farm may advertise high APY while the reward token steadily loses value.

Key Insight

Part 4: Real Yield vs. Unsustainable Yield

Real Yield

Real yield comes from actual economic activity such as:

• Trading activity

• Borrowing demand

Unsustainable Yield

Unsustainable yield often comes from:

• Token emissions

• Printing new tokens

Operator Rule

If yield depends mostly on emissions, it will likely decline over time.

Part 5: Aggregators (Automation Layer)

What Are Aggregators?

Aggregators are platforms that automatically optimize yield strategies.

Examples

• Yearn Finance

• Beefy Finance

• Pendle Finance

What They Do

• Auto-compound rewards

• Move funds into better opportunities

• Optimize yield strategies

The Tradeoff

More layers of automation create more smart contract risk.

Key Insight

Part 6: Token Use Types

Not All Tokens Are the Same

Different tokens serve different purposes in DeFi.

1. Staking Tokens

Purpose:

• Earn yield by locking tokens

2. Governance Tokens

Purpose:

• Give voting power within protocols

Important Reality

Many governance tokens are also used as incentives.

3. LP Tokens

Purpose:

• Represent your liquidity position in a pool

4. Reward Tokens

Purpose:

• Distributed as farming incentives

Most Important Rule

Reward tokens are often the weakest in long-term value.

Key Insight

Part 7: Yield Stacking (Advanced Concept)

Example

You:

• Provide liquidity

• Receive an LP token

• Stake the LP token for additional rewards

• Reinvest the rewards

Result

This creates:

• Compounding yield

But also:

• Compounding risk

Operator Rule

More yield layers create more failure points.

Part 8: APR vs. APY

APR

APR represents simple return without compounding.

APY

APY represents compounded return.

The Problem

APY calculations often assume:

• Constant reinvestment

Reality

Most users never achieve the advertised APY in practice.

Part 9: Yield Sustainability Framework

Before Entering Any Opportunity

Ask yourself:

• Where does the yield come from?

• Is it real yield or emissions?

• Who is paying for it?

• How long can it realistically last?

Red Flags

• Extremely high APY

• No real usage or demand

• Heavy token inflation

Part 10: Operator Mental Models

Important Mental Models

• If yield is high, risk is usually high

• If there is no real revenue, the system may be unsustainable

• If users leave, yield can collapse quickly

Practice Mission

Pick a liquidity pool or farming opportunity.

Analyze:

• Source of yield

• Token rewards

• Trading volume and activity

Challenge

Ask yourself:

“If rewards stopped today, would this still generate yield?”

Final Thought