diff --git a/xexe/processes.py b/xexe/processes.py
index 51f3c6c..6bd47d8 100644
--- a/xexe/processes.py
+++ b/xexe/processes.py
@@ -83,11 +83,20 @@ def run_get_rates(
 
     process_state = GetRatesProcessState(ignore_warnings=ignore_warnings)
 
+    if currencies:
+        currency_and_date_combinations = generate_currency_and_dates_combinations(
+            date_range=date_range, currencies=currencies
+        )
+
+    if pairs:
+        currency_and_date_combinations = generate_pairs_and_dates_combinations(
+            date_range=date_range, pairs=pairs
+        )
+
     rates = obtain_rates_from_source(
         rates_source=rates_source,
         date_range=date_range,
-        pairs=pairs,
-        currencies=currencies,
+        currency_and_date_combinations=currency_and_date_combinations,
         ignore_warnings=ignore_warnings,
     )
     logger.info("Rates obtained.")
@@ -103,23 +112,12 @@ def obtain_rates_from_source(
     rates_source: str,
     date_range: DateRange,
     ignore_warnings: bool,
-    currencies: Union[Set[Currency], None] = None,
-    pairs: Union[Set[CurrencyPair], None] = None,
+    currency_and_date_combinations,
 ) -> ExchangeRates:
     rates_fetcher = build_rate_fetcher(
         rates_source=rates_source, rate_sources_mapping=RATES_SOURCES
     )
 
-    if currencies:
-        currency_and_date_combinations = generate_currency_and_dates_combinations(
-            date_range=date_range, currencies=currencies
-        )
-
-    if pairs:
-        currency_and_date_combinations = generate_pairs_and_dates_combinations(
-            date_range=date_range, pairs=pairs
-        )
-
     large_api_call_planned = (
         rates_fetcher.is_production_grade and len(currency_and_date_combinations) > 100
     )