diff --git a/src/onchain/TestArbitrage.sol b/src/onchain/TestArbitrage.sol
index 357d517..2afa76c 100644
--- a/src/onchain/TestArbitrage.sol
+++ b/src/onchain/TestArbitrage.sol
@@ -180,6 +180,13 @@ contract TestArbitrage is IFlashLoanRecipient, ReentrancyGuard, Ownable, Pausabl
     /// @param executionTime Time taken for execution (in seconds)
     event TradeCompleted(uint256 indexed tradeId, uint256 profit, uint256 gasUsed, uint256 executionTime);
 
+    /// @notice Emitted when a trade fails with detailed error information
+    /// @param tradeId Unique identifier for this trade
+    /// @param reason Error message describing the failure
+    /// @param step Which step of the process failed (1=first swap, 2=second swap, 3=repayment)
+    /// @param gasUsed Gas consumed before failure
+    event TradeFailed(uint256 indexed tradeId, string reason, uint8 step, uint256 gasUsed);
+
     /// @notice Emitted when contract configuration is updated
     /// @param parameter Name of the parameter changed
     /// @param oldValue Previous value