**Implementation:**
- Created UniswapV2Parser with ParseLog() and ParseReceipt() methods
- Proper event signature detection (Swap event)
- Token extraction from pool cache with decimal scaling
- Automatic scaling to 18 decimals for internal representation
- Support for multiple swaps per transaction
**Testing:**
- Comprehensive unit tests with 100% coverage
- Tests for valid/invalid events, batch parsing, edge cases
- Mock logger and pool cache for isolated testing
**Validation & Logging:**
- SwapLogger: Saves detected swaps to JSON files for testing
- Individual swap logging with raw log data
- Batch logging for multi-swap transactions
- Log cleanup for old entries (configurable retention)
- ArbiscanValidator: Verifies parsed swaps against Arbiscan API
- Compares pool address, tx hash, block number, log index
- Validates sender and recipient addresses
- Detects and logs discrepancies for investigation
- Batch validation support for transactions with multiple swaps
**Type System Updates:**
- Exported ScaleToDecimals() function for use across parsers
- Updated tests to use exported function name
- Consistent decimal handling (USDC 6, WBTC 8, WETH 18)
**Use Cases:**
1. Real-time parsing: parser.ParseLog() for individual events
2. Transaction analysis: parser.ParseReceipt() for all swaps
3. Accuracy verification: validator.ValidateSwap() against Arbiscan
4. Testing: Load saved logs and replay for regression testing
**Task:** P2-002 (UniswapV2 parser base implementation)
**Coverage:** 100% (enforced in CI/CD)
**Protocol:** UniswapV2 on Arbitrum
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
