diff --git a/ProjectPlugins/CodexPlugin/CodexApiTypes.cs b/ProjectPlugins/CodexPlugin/CodexApiTypes.cs
index b1965cd..96d19ef 100644
--- a/ProjectPlugins/CodexPlugin/CodexApiTypes.cs
+++ b/ProjectPlugins/CodexPlugin/CodexApiTypes.cs
@@ -87,7 +87,7 @@ namespace CodexPlugin
 
     public class CodexSalesAvailabilityRequest
     {
-        public string size { get; set; } = string.Empty;
+        public string totalSize { get; set; } = string.Empty;
         public string duration { get; set; } = string.Empty;
         public string minPrice { get; set; } = string.Empty;
         public string maxCollateral { get; set; } = string.Empty;
@@ -96,7 +96,8 @@ namespace CodexPlugin
     public class CodexSalesAvailabilityResponse
     {
         public string id { get; set; } = string.Empty;
-        public string size { get; set; } = string.Empty;
+        public string totalSize { get; set; } = string.Empty;
+        public string freeSize { get; set; } = string.Empty;
         public string duration { get; set; } = string.Empty;
         public string minPrice { get; set; } = string.Empty;
         public string maxCollateral { get; set; } = string.Empty;
diff --git a/ProjectPlugins/CodexPlugin/MarketplaceTypes.cs b/ProjectPlugins/CodexPlugin/MarketplaceTypes.cs
index bfdf1ff..dc7f7e5 100644
--- a/ProjectPlugins/CodexPlugin/MarketplaceTypes.cs
+++ b/ProjectPlugins/CodexPlugin/MarketplaceTypes.cs
@@ -67,7 +67,7 @@ namespace CodexPlugin
         {
             return new CodexSalesAvailabilityRequest
             {
-                size = ToDecInt(TotalSpace.SizeInBytes),
+                totalSize = ToDecInt(TotalSpace.SizeInBytes),
                 duration = ToDecInt(MaxDuration.TotalSeconds),
                 maxCollateral = ToDecInt(MaxCollateral),
                 minPrice = ToDecInt(MinPriceForTotalSpace)
@@ -77,7 +77,7 @@ namespace CodexPlugin
         public void Log(ILog log)
         {
             log.Log($"Making storage available... (" +
-                $"size: {TotalSpace}, " +
+                $"totalSize: {TotalSpace}, " +
                 $"maxDuration: {Time.FormatDuration(MaxDuration)}, " + 
                 $"minPriceForTotalSpace: {MinPriceForTotalSpace}, " +
                 $"maxCollateral: {MaxCollateral})");