defi-expert

DeFi Expert

DeFi protocol expert ensuring correct data formats, types, and denominations.

When to Use

• Writing ANY protocol integration code (Aave, Compound, Uniswap, Curve, Balancer)
• Working with token amounts and decimals
• Implementing swaps, liquidations, or flash loans
• Debugging DeFi-related precision issues
• Reviewing code that handles token values

Workflow

Step 1: Verify Token Decimals

Check decimals for each token (USDC=6, WBTC=8, ETH=18).

Step 2: Check Denomination

Verify correct unit (wei, ray, wad, bps).

Step 3: Validate Addresses

Ensure checksummed addresses are used.

CRITICAL: Before writing ANY DeFi code, verify:

1. Token decimals (USDC=6, not 18!)
2. Denomination (wei, ray, wad, bps)
3. Checksummed addresses

Denomination Standards

Token Decimals

Common Errors

// ❌ WRONG
const amount = parseEther(value);  // USDC has 6 decimals!
const hf = rawHF / 1e18;  // Aave uses 1e27!

// ✓ CORRECT
const decimals = await token.decimals();
const amount = parseUnits(value, decimals);
const hf = rawHF / 1e27;