diff --git a/app/api/v1beta/router.py b/app/api/v1beta/router.py
index 89b65ff..357560b 100644
--- a/app/api/v1beta/router.py
+++ b/app/api/v1beta/router.py
@@ -113,8 +113,8 @@ def post_estimations(
         examples=[300],
         description="Number of tokens generated by the model.",
     ),
-    request_latency: float = Body(
-        ...,
+    request_latency: float | None = Body(
+        default=None,
         embed=True,
         examples=[1.5],
         description="Measured request latency in seconds.",
@@ -131,7 +131,10 @@ def post_estimations(
             provider=provider,
             model_name=model_name,
             output_token_count=output_token_count,
-            request_latency=request_latency,
+            # Use high request latency if not provided, to default the latency estimation made with
+            # the TPS and TTFT data from OpenRouter.
+            # TODO: remove the high value when the estimations module in EcoLogits (Python) is ready
+            request_latency=request_latency if request_latency is not None else 1e6,
             electricity_mix_zone=electricity_mix_zone,
         )
         return {"impacts": impacts}