How Do Concrete Vaults Actually Work?

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▶️ Start From Your Experience

Imagine you’re casually opening the Concrete app on your phone. You connect your wallet, decide to deposit 100 USDC into a vault, confirm the transaction… and that’s it — done in seconds.

Right after that, you’ll notice something new in your wallet: vault shares. These aren’t just random tokens — they represent your ownership in the total pool of funds inside that vault.

When you open the vault page, you’ll usually see a few key metrics. Two of the most important (and sometimes confusing) ones are:

• eRate
• NAV

They might sound technical, but the concepts are actually very intuitive when broken down properly 👇

▶️ Vault Shares & eRate (Made Simple & Fun)

✨ Vault shares = your ownership slice
Think of the vault like a big, freshly baked pizza 🍕

Everyone who deposits is contributing ingredients to make that pizza. Once it’s ready, each person gets a slice proportional to how much they contributed.

That slice is your vault share.

Here’s the key idea:
👉 The number of slices you own stays the same
👉 But the value of each slice can increase over time

So even if your share count doesn’t change, your total value can grow.

✨ eRate = the price per slice
Now let’s talk about eRate.

If shares are your slices, then eRate is simply the price of each slice.

At the beginning:

• eRate = 1.000
  👉 1 share = 1 USDC

As the vault starts generating yield, the total value inside the vault increases. Since the number of shares doesn’t change, the value per share goes up.

For example:

• eRate increases to 1.045

That means:
👉 1 share = 1.045 USDC
👉 If you hold 100 shares = 104.5 USDC

And the best part:
✨ No manual action needed
✨ No claiming required
✨ No extra steps

The value grows automatically as the eRate increases.

✨ The simplest way to think about it:

• Shares = how many you own
• eRate = value per share
• Total value = shares × eRate

▶️ NAV (Net Asset Value) Without the Jargon

✨ What is NAV?
NAV stands for Net Asset Value, which is simply the total value of everything the vault owns at a given moment.

This includes:

• User deposits
• Yield that has been generated
• Positions across different DeFi protocols

So you can think of NAV as the total value of the entire pizza before it’s sliced 😄

✨ Simple formula:
NAV = total assets − fees / liabilities

These deductions could include:

• Management fees
• Operational costs
• Any outstanding obligations

✨ Why NAV matters to you
Because NAV is the foundation of your investment’s value.

If NAV grows:
👉 The vault becomes more valuable
👉 Every share becomes more valuable

Example:

• NAV grows from 10M → 10.5M USDC
  👉 That’s a 5% increase

Since every share represents the same fraction:
👉 Your holdings also increase by ~5%

✨ Key relationship to remember:
👉 eRate = NAV ÷ total shares

So whenever NAV increases, eRate follows.

▶️ Why Time Is So Important

One of the biggest misconceptions in DeFi is expecting instant results. In reality, yield strategies need time to work effectively.

✨ 1. Strategies take time
Many protocols require multiple blocks to generate rewards.

➡️ Analogy:
Like growing a garden 🌱
You don’t harvest right after planting

✨ 2. Execution costs exist
Every move (depositing, swapping, rebalancing) costs gas.

Too much activity:
👉 Eats into profits

➡️ Analogy:
Like ordering food delivery every day the fees add up fast 📦

✨ 3. Stability of the pool
Vaults perform best in stable conditions.

If users constantly enter and exit:
👉 Liquidity gets disrupted
👉 Slippage increases
👉 Efficiency drops

➡️ Analogy:
A swimming pool constantly being drained and refilled 💧

✨ 4. The power of compounding
This is where the magic really happens.

Earned yield isn’t withdrawn it’s reinvested.

➡️ Analogy:
Like interest in a savings account 💰
The longer it stays, the faster it grows

👉 Key takeaway:
Vaults are designed for medium to long-term participation, not quick in-and-out moves.

▶️ Active Management (Your Vault Is Working Behind the Scenes)

Concrete vaults are not passive storage they are actively managed systems.

✨ Here’s what happens in the background:

• Capital deployment
Funds are allocated to the best yield opportunities

• Rebalancing
If better opportunities appear, funds are shifted

• Harvesting rewards
Earnings are collected regularly

• Auto-compounding
Rewards are converted and reinvested

➡️ Simple analogy:

Think of the vault as a professional kitchen 🍳
And the system as an experienced chef

The chef will:

• Choose the best ingredients
• Adjust recipes when needed
• Decide when to cook and when to wait

All to create the best possible result your returns 🔥

▶️ How Everything Works Together

There are two main forces driving growth:

✨ Compounding effect
Rewards are reinvested → NAV increases → eRate rises

✨ Strategic allocation
Capital is constantly moved to better opportunities

👉 The longer you stay invested:

• The more compounding cycles you benefit from
• The more optimization the system can perform

That’s why long-term participants often see better effective returns than those who frequently jump in and out 📈

▶️ Final Mental Model (Easy to Remember)

• Vault
A pooled capital system that actively works
➡️ Not just stored, but optimized

• Shares
Your ownership
➡️ Fixed amount, growing value

• eRate
Price per share
➡️ Reflects performance

• NAV
Total vault value
➡️ The source of growth

• Time
The engine of compounding
➡️ Longer = stronger effect

• Management
Automated and active
➡️ Always optimizing

✨ Final takeaway (simple version):
You deposit → you receive shares

From there:

• The vault does the work
• NAV grows
• eRate increases
• Your position gains value

And over time, compounding turns small gains into something much more powerful 🚀