diff --git a/controllers/apiUsagePricing.js b/controllers/apiUsagePricing.js
index d86a228..6cb8966 100644
--- a/controllers/apiUsagePricing.js
+++ b/controllers/apiUsagePricing.js
@@ -79,7 +79,7 @@ const registerUsage = async (req, res) => {
             billingBy,
             billingUnit,
             companyId,
-            total_cost: calculateApiUsage(price, billingUnit, usage, billingBy)
+            total_cost: calculateApiUsage(price, billingUnit, usage)
         })
 
         return res.status(StatusCodes.OK).json({ apiUsage })
@@ -182,7 +182,7 @@ const registerAll = async (req, res) => {
                     billingBy,
                     billingUnit,
                     companyId,
-                    total_cost: calculateApiUsage(price, billingUnit, usage, billingBy)
+                    total_cost: calculateApiUsage(price, billingUnit, usage)
                 })
 
             }
diff --git a/models/API_Pricing.js b/models/API_Pricing.js
index 329d61d..c497b10 100644
--- a/models/API_Pricing.js
+++ b/models/API_Pricing.js
@@ -22,7 +22,7 @@ const apiPricing = new Schema({
     },
     billingBy:{
         type: String,
-        enum: ['minute', 'character', 'token'],
+        enum: ['minute', 'character', 'token', 'second'],
         required: true,
     },
     billingUnit:{
diff --git a/utils/calculateApiUsage.js b/utils/calculateApiUsage.js
index 536ba26..c3f9e5e 100644
--- a/utils/calculateApiUsage.js
+++ b/utils/calculateApiUsage.js
@@ -1,12 +1,9 @@
 
 
 function calculateApiUsage(price, billingUnit, usage, billingBy) {
-  let _billingUnit = +billingUnit
-
-  if (billingBy == 'minute')
-    _billingUnit = 60 * _billingUnit 
-
-  const total_cost = (+usage / _billingUnit) * parseFloat(price) 
+ 
+ 
+  const total_cost = (+usage / +billingUnit) * parseFloat(price) 
 
   return total_cost.toFixed(10)
 }