diff --git a/contracts/Streamonomics.sol b/contracts/Streamonomics.sol
index 3728c22..07e723c 100644
--- a/contracts/Streamonomics.sol
+++ b/contracts/Streamonomics.sol
@@ -28,19 +28,61 @@ contract Streamonomics is Ownable {
         require(percentage.length == start.length, "!len");
         require(start.length == step.length, "!len");
         require(step.length == limit.length, "!len");
+
+        // Prevent setting too many streamonomics that could cause gas issues
+        require(percentage.length <= 100, "Too many streamonomics");
+
+     
         emit StreamonomicsDeleted(streamonomics.length);
         delete streamonomics;
-        uint256 total;
+
+      uint256 totalPercentage;
+        uint256 previousLimit;
+        
         for(uint i = 0; i < percentage.length; i++) {
+            // Validate percentage is reasonable (0-100)
+            require(percentage[i] <= 100, "Percentage exceeds 100");
+            
+            // Validate start <= limit
+            require(start[i] <= limit[i], "Start must be <= limit");
+            
+            // Validate step is not zero (unless start == limit)
+            if (start[i] < limit[i]) {
+                require(step[i] > 0, "Step must be > 0 when start < limit");
+            }
+            
+            // Check for non-overlapping ranges in ascending order
+            // This assumes streamonomics should be in ascending order of ranges
+            if (i > 0) {
+                require(start[i] > previousLimit, "Ranges overlap or not in order");
+            }
+            
+            // Check for duplicate entries
+            for (uint j = 0; j < i; j++) {
+                require(
+                    percentage[i] != percentage[j] ||
+                    start[i] != start[j] ||
+                    step[i] != step[j] ||
+                    limit[i] != limit[j],
+                    "Duplicate streamonomic entry"
+                );
+            }
+            
             streamonomics.push(Streamonomic(percentage[i], start[i], step[i], limit[i]));
             emit StreamonomicAdded(percentage[i], start[i], step[i], limit[i]);
-            total += percentage[i];
+            
+            totalPercentage += percentage[i];
+            previousLimit = limit[i];
+            
+            // Check for overflow (very unlikely with percentages, but good practice)
+            require(totalPercentage >= percentage[i], "Percentage addition overflow");
         }
-        require(total <= 100, "!>100");
+        
+        require(totalPercentage <= 100, "Total percentage exceeds 100");
     }
 
     function getStreamonomics() external view returns(Streamonomic[] memory) {
         return streamonomics;
     }
 
-}
\ No newline at end of file
+}