**Curve StableSwap Parser** (`curve.go`):
- TokenExchange event parsing (address,int128,uint256,int128,uint256)
- TokenExchangeUnderlying event support for wrapped tokens
- Coin index (int128) to token address mapping
- Handles 2-coin and multi-coin pools
- Typical use: USDC/USDT, DAI/USDC stablecoin swaps
- Low slippage due to amplification coefficient (A parameter)
- Fee: typically 0.04% (4 basis points)
**Key Features:**
- Buyer address extraction from indexed topics
- Coin ID to token mapping via pool cache
- Both directions: token0→token1 and token1→token0
- Buyer is both sender and recipient (Curve pattern)
- Support for 6-decimal stablecoins (USDC, USDT)
**Testing** (`curve_test.go`):
- TokenExchange and TokenExchangeUnderlying signature validation
- Swap direction tests (USDC→USDT, USDT→USDC)
- Multi-event receipts with mixed protocols
- Decimal scaling validation (6 decimals → 18 decimals)
- Pool not found error handling
**Type System Fix:**
- Exported ScaleToDecimals() function in pkg/types/pool.go
- Updated all callers to use exported function
- Fixed test function name (TestScaleToDecimals)
- Consistent across all parsers (V2, V3, Curve)
**Use Cases:**
1. Stablecoin arbitrage (Curve vs Uniswap pricing)
2. Low-slippage large swaps (Curve specialization)
3. Multi-coin pool support (3pool, 4pool)
4. Underlying vs wrapped token detection
**Task:** P2-018 (Curve StableSwap parser)
**Coverage:** 100% (enforced in CI/CD)
**Protocol:** Curve StableSwap on Arbitrum
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>