diff --git a/README.md b/README.md
index 55c68f6..43cd056 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,8 @@ export OVH_ENDPOINT="ovh-eu"
 export OVH_APP_KEY=""
 export OVH_APP_SECRET=""
 export OVH_CONSUMER_KEY=""
-export OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_ID=""
-export OVH_CACHE_UPDATE_INTERVAL="60"
+export OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_IDS=""
+export OVH_CACHE_UPDATE_INTERVAL="300"
 export SERVER_PORT="8080"
 ```
 
diff --git a/compose.yaml b/compose.yaml
index c496f56..fdbf03c 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -11,6 +11,6 @@ services:
       OVH_APP_KEY: ""
       OVH_APP_SECRET: ""
       OVH_CONSUMER_KEY: ""
-      OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_ID: ""
-      OVH_CACHE_UPDATE_INTERVAL: "60"
+      OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_IDS: ""
+      OVH_CACHE_UPDATE_INTERVAL: "300"
       SERVER_PORT: "8080"
diff --git a/pkg/network/serve.go b/pkg/network/serve.go
index 4cc3a3e..35fd025 100644
--- a/pkg/network/serve.go
+++ b/pkg/network/serve.go
@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/ovh/go-ovh/ovh"
@@ -56,51 +57,60 @@ func setCloudProjectInstanceBilling(projectID string, instanceID string, instanc
 	}).Set(amount)
 }
 
-func updateCloudProviderInstanceBilling(ovhClient *ovh.Client) {
-	logger.Info().Msg("updating cloud provider instance billing")
+func updateCloudProviderInstanceBillingPerInstance(projectID string, instance models.InstanceSummary, flavors []models.Flavor) {
+	logger.Info().Msgf("updating cloud provider instance billing for instance %s", instance.ID)
+
+	flavor := api.FindFlavorByID(flavors, instance.FlavorID)
+	planType := "undefined"
+	if instance.PlanCode != nil && flavor.PlanCodes.Hourly != nil && flavor.PlanCodes.Monthly != nil {
+		switch {
+		case *instance.PlanCode == *flavor.PlanCodes.Hourly:
+			planType = "hourly"
+		case *instance.PlanCode == *flavor.PlanCodes.Monthly:
+			planType = "monthly"
+		}
+	}
+	instancePlanCode := "undefined"
+	if instance.PlanCode != nil {
+		instancePlanCode = *instance.PlanCode
+	}
+	instanceMonthlyBillingSince := time.Unix(0, 0)
+	instanceMonthlyBillingStatus := "undefined"
+	if instance.MonthlyBilling != nil {
+		instanceMonthlyBillingSince = instance.MonthlyBilling.Since
+		instanceMonthlyBillingStatus = instance.MonthlyBilling.Status
+	}
 
-	projectID := os.Getenv("OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_ID")
+	setCloudProjectInstanceBilling(projectID, instance.ID, instance.Name, planType, instancePlanCode, instanceMonthlyBillingSince, instanceMonthlyBillingStatus, 1)
+}
+
+func updateCloudProviderInstanceBillingPerProjectID(ovhClient *ovh.Client, projectID string) {
+	logger.Info().Msgf("updating cloud provider instance billing for project %s", projectID)
 
 	projectInstances, err := api.GetCloudProjectInstances(ovhClient, projectID)
 	if err != nil {
-		logger.Error().Err(err).Msgf("Failed to retrieve instances: %v", err)
+		logger.Error().Msgf("Failed to retrieve instances: %v", err)
+		return
 	}
 
-	var flavors []models.Flavor
-	for _, instance := range projectInstances {
-		if api.FindFlavorByID(flavors, instance.FlavorID) == nil {
-			flavor, err := api.GetCloudProjectFlavor(ovhClient, projectID, instance.FlavorID)
-			if err != nil {
-				logger.Error().Err(err).Msgf("Failed to retrieve flavor: %v", err)
-			} else {
-				flavors = append(flavors, flavor)
-			}
-		}
+	flavors, err := api.GetCloudProjectFlavorsPerInstances(ovhClient, projectID, projectInstances)
+	if err != nil {
+		logger.Error().Msgf("Failed to retrieve flavors: %v", err)
+		return
 	}
 
 	for _, instance := range projectInstances {
-		flavor := api.FindFlavorByID(flavors, instance.FlavorID)
-		planType := "undefined"
-		if instance.PlanCode != nil && flavor.PlanCodes.Hourly != nil && flavor.PlanCodes.Monthly != nil {
-			switch {
-			case *instance.PlanCode == *flavor.PlanCodes.Hourly:
-				planType = "hourly"
-			case *instance.PlanCode == *flavor.PlanCodes.Monthly:
-				planType = "monthly"
-			}
-		}
-		instancePlanCode := "undefined"
-		if instance.PlanCode != nil {
-			instancePlanCode = *instance.PlanCode
-		}
-		instanceMonthlyBillingSince := time.Unix(0, 0)
-		instanceMonthlyBillingStatus := "undefined"
-		if instance.MonthlyBilling != nil {
-			instanceMonthlyBillingSince = instance.MonthlyBilling.Since
-			instanceMonthlyBillingStatus = instance.MonthlyBilling.Status
-		}
+		updateCloudProviderInstanceBillingPerInstance(projectID, instance, flavors)
+	}
+}
+
+func updateCloudProviderInstanceBilling(ovhClient *ovh.Client) {
+	projectIDs := os.Getenv("OVH_CLOUD_PROJECT_INSTANCE_BILLING_PROJECT_IDS")
+
+	projectIDList := strings.Split(projectIDs, ",")
 
-		setCloudProjectInstanceBilling(projectID, instance.ID, instance.Name, planType, instancePlanCode, instanceMonthlyBillingSince, instanceMonthlyBillingStatus, 1)
+	for _, projectID := range projectIDList {
+		updateCloudProviderInstanceBillingPerProjectID(ovhClient, projectID)
 	}
 }
 
diff --git a/pkg/ovhsdk/api/cloud_project_flavor.go b/pkg/ovhsdk/api/cloud_project_flavor.go
index 2acfb8b..5629718 100644
--- a/pkg/ovhsdk/api/cloud_project_flavor.go
+++ b/pkg/ovhsdk/api/cloud_project_flavor.go
@@ -1,6 +1,8 @@
 package api
 
 import (
+	"fmt"
+
 	"github.com/ovh/go-ovh/ovh"
 	"github.com/wiremind/ovh-exporter/pkg/ovhsdk/models"
 )
@@ -14,6 +16,26 @@ func FindFlavorByID(flavors []models.Flavor, flavorID string) *models.Flavor {
 	return nil
 }
 
+func GetCloudProjectFlavorsPerInstances(ovhClient *ovh.Client, projectID string, projectInstances []models.InstanceSummary) ([]models.Flavor, error) {
+	var flavors []models.Flavor
+	var apierr error = nil
+	for _, instance := range projectInstances {
+		if FindFlavorByID(flavors, instance.FlavorID) == nil {
+			flavor, err := GetCloudProjectFlavor(ovhClient, projectID, instance.FlavorID)
+			if err != nil {
+				if apierr == nil {
+					apierr = fmt.Errorf("Failed to retrieve flavor: %v", err)
+				} else {
+					apierr = fmt.Errorf("%s; %v", apierr, err)
+				}
+			} else {
+				flavors = append(flavors, flavor)
+			}
+		}
+	}
+	return flavors, apierr
+}
+
 func GetCloudProjectFlavor(client *ovh.Client, projectID string, flavorID string) (models.Flavor, error) {
 	var flavor models.Flavor
 
diff --git a/pkg/ovhsdk/api/cloud_project_instance_billing.go b/pkg/ovhsdk/api/cloud_project_instance_billing.go
index f185072..c0341ed 100644
--- a/pkg/ovhsdk/api/cloud_project_instance_billing.go
+++ b/pkg/ovhsdk/api/cloud_project_instance_billing.go
@@ -6,35 +6,27 @@ import (
 )
 
 func GetCloudProjectInstances(client *ovh.Client, projectID string) ([]models.InstanceSummary, error) {
-	// Define the response structure for the instance billing
 	var instances []models.InstanceSummary
 
-	// Build the API endpoint
 	endpoint := "/cloud/project/" + projectID + "/instance"
 
-	// Call OVH API to get instance data
 	err := client.Get(endpoint, &instances)
 	if err != nil {
 		return instances, err
 	}
 
-	// Return the billing price for this instance
 	return instances, nil
 }
 
 func GetCloudProjectInstance(client *ovh.Client, projectID string, instanceID string) (models.Instance, error) {
-	// Define the response structure for the instance billing
 	var instanceData models.Instance
 
-	// Build the API endpoint
 	endpoint := "/cloud/project/" + projectID + "/instance/" + instanceID
 
-	// Call OVH API to get instance data
 	err := client.Get(endpoint, &instanceData)
 	if err != nil {
 		return instanceData, err
 	}
 
-	// Return the billing price for this instance
 	return instanceData, nil
 }