defi-expertlisted

# 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 | Unit | Decimals | Usage | |------|----------|-------| | wei | 0 | ETH amounts | | ray | 27 | Aave rates | | wad | 18 | MakerDAO | | bps | 4 | Basis points (100 = 1%) | ## Token Decimals | Token | Decimals | |-------|----------| | ETH/WETH | 18 | | USDC | 6 ⚠️ | | USDT | 6 ⚠️ | | DAI | 18 | | WBTC | 8 ⚠️ | ## Common Errors ```typescript // ❌ 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; ```