diff --git a/pkg/endpoints/endpoints.go b/pkg/endpoints/endpoints.go
index fc203aa..fe46380 100644
--- a/pkg/endpoints/endpoints.go
+++ b/pkg/endpoints/endpoints.go
@@ -45,7 +45,7 @@ func ToJsonString(d DiscoveredInstances) ([]byte, error) {
 }
 
 func labels(tags map[string]string, targetHost string, path string, metricName string) map[string]string {
-	labels := lowerMapKeys(tags)
+	labels := standardizeKeys(tags)
 	labels["__metrics_path__"] = path
 	labels["__address__"] = targetHost
 	if val, ok := labels["name"]; ok {
@@ -55,10 +55,11 @@ func labels(tags map[string]string, targetHost string, path string, metricName s
 	return labels
 }
 
-func lowerMapKeys(tags map[string]string) map[string]string {
+func standardizeKeys(tags map[string]string) map[string]string {
 	lowerMap := map[string]string{}
 	for key, value := range tags {
-		lowerMap[strings.ToLower(key)] = value
+		reducedByEmpty := strings.ReplaceAll(key, " ", "-")
+		lowerMap[strings.ToLower(reducedByEmpty)] = value
 	}
 	return lowerMap
 }
diff --git a/pkg/endpoints/endpoints_test.go b/pkg/endpoints/endpoints_test.go
index 65ca6ec..619a4d4 100644
--- a/pkg/endpoints/endpoints_test.go
+++ b/pkg/endpoints/endpoints_test.go
@@ -9,7 +9,7 @@ func TestToJsonStringHasCorrectContent(t *testing.T) {
 	instanceList := InstanceList()
 
 	returnedJSONContentBytes, _ := ToJsonString(DiscoveredInstances{Instances: instanceList})
-	expectedJSONContent := "[{\"targets\":[\"127.0.0.1:9100\"],\"labels\":{\"__address__\":\"127.0.0.1:9100\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"1111\",\"instancename\":\"Testinstance1\",\"name\":\"node_exporter\"}},{\"targets\":[\"127.0.0.1:8080\"],\"labels\":{\"__address__\":\"127.0.0.1:8080\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"1111\",\"instancename\":\"Testinstance1\",\"name\":\"blackbox_exporter\"}},{\"targets\":[\"127.0.0.2:9100\"],\"labels\":{\"__address__\":\"127.0.0.2:9100\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"2222\",\"instancename\":\"Testinstance2\",\"name\":\"node_exporter\"}}]"
+	expectedJSONContent := "[{\"targets\":[\"127.0.0.1:9100\"],\"labels\":{\"__address__\":\"127.0.0.1:9100\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"1111\",\"instancename\":\"Testinstance1\",\"name\":\"node_exporter\",\"spot-price\":\"123\"}},{\"targets\":[\"127.0.0.1:8080\"],\"labels\":{\"__address__\":\"127.0.0.1:8080\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"1111\",\"instancename\":\"Testinstance1\",\"name\":\"blackbox_exporter\",\"spot-price\":\"123\"}},{\"targets\":[\"127.0.0.2:9100\"],\"labels\":{\"__address__\":\"127.0.0.2:9100\",\"__metrics_path__\":\"/metrics\",\"billingnumber\":\"2222\",\"instancename\":\"Testinstance2\",\"name\":\"node_exporter\"}}]"
 
 	if expectedJSONContent != string(returnedJSONContentBytes) {
 		t.Errorf("Expected json string with content %s, but got %s", expectedJSONContent, string(returnedJSONContentBytes))
@@ -24,6 +24,7 @@ func InstanceList() []Instance {
 	tagsI1 := make(map[string]string)
 	tagsI1["Name"] = "Testinstance1"
 	tagsI1["billingnumber"] = "1111"
+	tagsI1["Spot price"] = "123"
 	metricsI1 := []InstanceMetrics{}
 	m1I1 := InstanceMetrics{
 		Name: "node_exporter",