diff --git a/erpnext/accounts/doctype/currency_exchange_settings/currency_exchange_settings.py b/erpnext/accounts/doctype/currency_exchange_settings/currency_exchange_settings.py
index b8817c60572c4fa6445a649ff6c8b35ceebbd23c..cbd2bbbc719e07a5f3abceccce85ca0eba8a02b2 100644
--- a/erpnext/accounts/doctype/currency_exchange_settings/currency_exchange_settings.py
+++ b/erpnext/accounts/doctype/currency_exchange_settings/currency_exchange_settings.py
@@ -43,7 +43,6 @@ class CurrencyExchangeSettings(Document):
 
 	def set_parameters_and_result(self):
 		if self.service_provider == "exchangerate.host":
-
 			if not self.access_key:
 				frappe.throw(
 					_("Access Key is required for Service Provider: {0}").format(
@@ -78,9 +77,7 @@ class CurrencyExchangeSettings(Document):
 				transaction_date=nowdate(), to_currency="INR", from_currency="USD"
 			)
 
-		api_url = self.api_endpoint.format(
-			transaction_date=nowdate(), to_currency="INR", from_currency="USD"
-		)
+		api_url = self.api_endpoint.format(transaction_date=nowdate(), to_currency="INR", from_currency="USD")
 
 		try:
 			response = requests.get(api_url, params=params)
@@ -100,19 +97,19 @@ class CurrencyExchangeSettings(Document):
 				]
 		except Exception:
 			frappe.throw(_("Invalid result key. Response:") + " " + response.text)
-		if not isinstance(value, (int, float)):
+		if not isinstance(value, (int | float)):
 			frappe.throw(_("Returned exchange rate is neither integer not float."))
 
 		self.url = response.url
 
 
 @frappe.whitelist()
-def get_api_endpoint(service_provider: str = None, use_http: bool = False):
+def get_api_endpoint(service_provider: str | None = None, use_http: bool = False):
 	if service_provider and service_provider in ["exchangerate.host", "frankfurter.app"]:
 		if service_provider == "exchangerate.host":
 			api = "api.exchangerate.host/convert"
 		elif service_provider == "frankfurter.app":
-			api = "frankfurter.app/{transaction_date}"
+			api = "api.frankfurter.app/{transaction_date}"
 
 		protocol = "https://"
 		if use_http:
diff --git a/erpnext/setup/doctype/currency_exchange/test_currency_exchange.py b/erpnext/setup/doctype/currency_exchange/test_currency_exchange.py
index 35dfee4736b64c6f4961d9043c077c293fc05c46..61a0307a38f494c85fd09619faf9e183d2c44f6e 100644
--- a/erpnext/setup/doctype/currency_exchange/test_currency_exchange.py
+++ b/erpnext/setup/doctype/currency_exchange/test_currency_exchange.py
@@ -48,6 +48,7 @@ def save_new_records(test_records):
 
 test_exchange_values = {"2015-12-15": "66.999", "2016-01-15": "65.1"}
 
+
 # Removing API call from get_exchange_rate
 def patched_requests_get(*args, **kwargs):
 	class PatchResponse:
@@ -66,9 +67,9 @@ def patched_requests_get(*args, **kwargs):
 		if kwargs["params"].get("date") and kwargs["params"].get("from") and kwargs["params"].get("to"):
 			if test_exchange_values.get(kwargs["params"]["date"]):
 				return PatchResponse({"result": test_exchange_values[kwargs["params"]["date"]]}, 200)
-	elif args[0].startswith("https://frankfurter.app") and kwargs.get("params"):
+	elif args[0].startswith("https://api.frankfurter.app") and kwargs.get("params"):
 		if kwargs["params"].get("base") and kwargs["params"].get("symbols"):
-			date = args[0].replace("https://frankfurter.app/", "")
+			date = args[0].replace("https://api.frankfurter.app/", "")
 			if test_exchange_values.get(date):
 				return PatchResponse(
 					{"rates": {kwargs["params"].get("symbols"): test_exchange_values.get(date)}}, 200
@@ -82,7 +83,7 @@ class TestCurrencyExchange(unittest.TestCase):
 	def clear_cache(self):
 		cache = frappe.cache()
 		for date in test_exchange_values.keys():
-			key = "currency_exchange_rate_{0}:{1}:{2}".format(date, "USD", "INR")
+			key = "currency_exchange_rate_{}:{}:{}".format(date, "USD", "INR")
 			cache.delete(key)
 
 	def tearDown(self):
diff --git a/erpnext/setup/install.py b/erpnext/setup/install.py
index 9b0c885e8aff0c7f147b46e23136dc572699d0aa..f7ed268389019623ee4f9bf34252da88ad1d3af6 100644
--- a/erpnext/setup/install.py
+++ b/erpnext/setup/install.py
@@ -106,7 +106,7 @@ def setup_currency_exchange():
 		ces.set("result_key", [])
 		ces.set("req_params", [])
 
-		ces.api_endpoint = "https://frankfurter.app/{transaction_date}"
+		ces.api_endpoint = "https://api.frankfurter.app/{transaction_date}"
 		ces.append("result_key", {"key": "rates"})
 		ces.append("result_key", {"key": "{to_currency}"})
 		ces.append("req_params", {"key": "base", "value": "{from_currency}"})