diff --git a/pyroengine/engine.py b/pyroengine/engine.py
index 32c424c1..4ab06fbd 100644
--- a/pyroengine/engine.py
+++ b/pyroengine/engine.py
@@ -251,6 +251,10 @@ def _update_states(self, frame: Image.Image, preds: np.array, cam_key: str) -> b
             else:
                 output_predictions = combine_predictions
 
+            # Limit bbox size in api
+            output_predictions = np.round(output_predictions, 3)  # max 3 digit
+            output_predictions = output_predictions[:5, :]  # max 5 bbox
+
         self._states[cam_key]["last_predictions"].append(
             (frame, preds, str(json.dumps(output_predictions.tolist())), datetime.utcnow().isoformat(), False)
         )