diff --git a/src/CoreApi/AddFileOptions.cs b/src/CoreApi/AddFileOptions.cs
index 4ed0de27..e4103e17 100644
--- a/src/CoreApi/AddFileOptions.cs
+++ b/src/CoreApi/AddFileOptions.cs
@@ -96,5 +96,15 @@ public class AddFileOptions
         ///   Used to report the progress of a file transfer.
         /// </summary>
         public IProgress<TransferProgress>? Progress { get; set; }
+
+        /// <summary>
+        /// Add the file using filestore. Implies raw-leaves.
+        /// </summary>
+        public bool? NoCopy {get; set; } 
+
+         /// <summary>
+        /// Check the filestore for pre-existing blocks. 
+        /// </summary>
+        public bool? FsCache{get; set; }
     }
 }
diff --git a/src/CoreApi/IFilestoreApi.cs b/src/CoreApi/IFilestoreApi.cs
new file mode 100644
index 00000000..7a08e209
--- /dev/null
+++ b/src/CoreApi/IFilestoreApi.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Ipfs.CoreApi
+{
+    /// <summary>
+    /// Abstraction for the file store api.
+    /// </summary>
+    public interface IFilestoreApi
+    {
+        /// <summary>
+        /// Lists blocks that are both in the filestore and standard block storage.
+        /// </summary>
+        public Task<IDupsResponse> DupsAsync(CancellationToken token);
+
+        /// <summary>
+        /// Lists filestore objects
+        /// </summary>
+        /// <param name="cid">Cid of objects to verify. Required: no.</param>
+        /// <param name="token">The cancellation token.</param>
+        /// <param name="fileOrder">Verify the objects based on the order of the backing file. Required: no.</param>
+        /// <returns></returns>
+        public Task<IFilestoreApiObjectResponse> ListAsync(string cid, bool fileOrder, CancellationToken token);
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="cid">Cid of objects to list. Required: no.</param>
+        /// <param name="token">The cancellation token.</param>
+        /// <param name="fileOrder">Lists the objects based on the order of the backing file. Required: no.</param>
+        /// <returns></returns>
+        public Task<IFilestoreApiObjectResponse> VerifyObjectsAsync(string cid, bool fileOrder, CancellationToken token);
+    }
+}
diff --git a/src/CoreApi/IFilestoreApiObjectResponse.cs b/src/CoreApi/IFilestoreApiObjectResponse.cs
new file mode 100644
index 00000000..17e8cf78
--- /dev/null
+++ b/src/CoreApi/IFilestoreApiObjectResponse.cs
@@ -0,0 +1,63 @@
+using Newtonsoft.Json;
+
+namespace Ipfs.CoreApi
+{
+    /// <summary>
+    /// Interface for <see cref="IFilestoreApi"/> repsonse.
+    /// </summary>
+    public interface IFilestoreApiObjectResponse
+    {
+        /// <summary>
+        /// Holds any error message.
+        /// </summary>
+        public string ErrorMsg { get; set; }
+
+        /// <summary>
+        /// Path to the file
+        /// </summary>
+        public string FilePath { get; set; }
+
+        /// <summary>
+        /// The response offset.
+        /// </summary>
+        public string Offset { get; set; }
+
+        /// <summary>
+        /// The size of the object.
+        /// </summary>
+        public string Size { get; set; }
+
+        /// <summary>
+        /// The object status.
+        /// </summary>
+        public string Status { get; set; }
+    }
+
+    /// <summary>
+    /// Model for the hold filestore key
+    /// </summary>
+    public interface IFilestoreKey
+    {
+        /// <summary>
+        /// Key value.
+        /// </summary>
+        [JsonProperty("/")]
+        public string _ { get; set; }
+    }
+
+    /// <summary>
+    /// Interface for <see cref="IDupsResponse"/> response.
+    /// </summary>
+    public interface IDupsResponse
+    {
+        /// <summary>
+        /// Any error in the <see cref="IFilestoreApi"/> Dups response.
+        /// </summary>
+        public string Err { get; set; }
+
+        /// <summary>
+        /// The error in the <see cref="IFilestoreApi"/> Dups response.
+        /// </summary>
+        public string Ref { get; set; }
+    }
+}