diff --git a/lib/lago/api/resources/billable_metric.rb b/lib/lago/api/resources/billable_metric.rb
index 2885d6d..509a143 100644
--- a/lib/lago/api/resources/billable_metric.rb
+++ b/lib/lago/api/resources/billable_metric.rb
@@ -33,6 +33,8 @@ def whitelist_params(params)
               field_name: params[:field_name],
               expression: params[:expression],
               filters: params[:filters],
+              rounding_function: params[:rounding_function],
+              rounding_precision: params[:rounding_precision],
             }.compact,
           }
         end
diff --git a/spec/fixtures/api/billable_metric.json b/spec/fixtures/api/billable_metric.json
index a7ab7c4..c37af8f 100644
--- a/spec/fixtures/api/billable_metric.json
+++ b/spec/fixtures/api/billable_metric.json
@@ -7,6 +7,8 @@
     "aggregation_type": "sum_agg",
     "weighted_interval": null,
     "recurring": false,
+    "rounding_function": "round",
+    "rounding_precision": 2,
     "expression": "1 + 2",
     "field_name": "amount_sum",
     "created_at": "2022-04-29T08:59:51Z",
diff --git a/spec/fixtures/api/billable_metric_index.json b/spec/fixtures/api/billable_metric_index.json
index d17df3b..b9eb15f 100644
--- a/spec/fixtures/api/billable_metric_index.json
+++ b/spec/fixtures/api/billable_metric_index.json
@@ -8,6 +8,8 @@
       "aggregation_type": "sum_agg",
       "weighted_interval": null,
       "recurring": false,
+      "rounding_function": "round",
+      "rounding_precision": 2,
       "expression": "1 + 2",
       "field_name": "amount_sum",
       "created_at": "2022-04-29T08:59:51Z",
@@ -24,6 +26,8 @@
       "aggregation_type": "sum_agg",
       "weighted_interval": null,
       "recurring": false,
+      "rounding_function": "round",
+      "rounding_precision": 2,
       "expression": "1 + 2",
       "field_name": "amount_sum",
       "created_at": "2022-04-30T08:59:51Z",