# Shielding ETH vs ERC-20 Tokens
## **Shielding ETH**
ETH shielding uses a single call:
```
// Assume wrapper is the cETH wrapper address
await wrapper.wrap(
yourAddress, // recipient
ethers.parseEther("1.0") // amount in wei
{ value: ethers.parseEther("1.01") } // includes fee
);
```
The wrapper:
1. Receives your ETH
2. Deducts the shield fee
3. Holds the remaining ETH in escrow
4. Mints equivalent cETH to your address (rate-adjusted)
## **Shielding ERC-20 Tokens**
ERC-20 shielding requires two steps: **approve → wrap**
```
// Step 1: Approve wrapper to spend your USDC
await usdcToken.approve(wrapperAddress, amount + fee);
// Step 2: Shield
await wrapper.wrap(yourAddress, amount);
```
The wrapper:
1. Transfers tokens from you to itself (via transferFrom)
2. Transfers fee to protocol fee recipient
3. Holds the principal in escrow
4. Mints equivalent cTokens to your address
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