diff --git a/CFCoreAPI/Endpoints/Categories/CategoriesAPI.cs b/CFCoreAPI/Endpoints/Categories/CategoriesAPI.cs
new file mode 100644
index 0000000..01cc2e1
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Categories/CategoriesAPI.cs
@@ -0,0 +1,28 @@
+using System.Text.Json;
+using CFCoreAPI.Endpoints.Categories.Responses;
+using Microsoft.AspNetCore.WebUtilities;
+
+namespace CFCoreAPI.Endpoints.Categories
+{
+    public class CategoriesAPI : APIBase
+    {
+        public CategoriesAPI(HttpClient httpClient) : base(httpClient)
+        {
+        }
+
+        public async Task<CategoriesResponse> GetCategories(int gameId, int? classId)
+        {
+            string url = "/v1/categories";
+            url = QueryHelpers.AddQueryString(url, "gameId", gameId.ToString());
+            if (classId != null) url = QueryHelpers.AddQueryString(url, "classId", classId.ToString());
+            HttpResponseMessage response = await httpClient.GetAsync(url);
+
+            CategoriesResponse result;
+            using (Stream contentStream = await response.Content.ReadAsStreamAsync())
+            {
+                result = (await JsonSerializer.DeserializeAsync<CategoriesResponse>(contentStream))!;
+            }
+            return result;
+        }
+    }
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Categories/Responses/CategoriesResponse.cs b/CFCoreAPI/Endpoints/Categories/Responses/CategoriesResponse.cs
new file mode 100644
index 0000000..dee852f
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Categories/Responses/CategoriesResponse.cs
@@ -0,0 +1,62 @@
+using System.Text.Json.Serialization;
+
+namespace CFCoreAPI.Endpoints.Categories.Responses
+{
+    public class CategoriesResponse
+    {
+        [JsonConstructor]
+        public CategoriesResponse(
+            List<DataModel> data
+        )
+        {
+            this.Data = data;
+        }
+
+        public IReadOnlyList<DataModel> Data { get; }
+
+        public class DataModel
+        {
+            [JsonConstructor]
+            public DataModel(
+                int id,
+                int gameId,
+                string name,
+                string slug,
+                string url,
+                string iconUrl,
+                DateTime dateModified,
+                bool isClass,
+                int classId,
+                int parentCategoryId,
+                int displayIndex
+            )
+            {
+                this.Id = id;
+                this.GameId = gameId;
+                this.Name = name;
+                this.Slug = slug;
+                this.Url = url;
+                this.IconUrl = iconUrl;
+                this.DateModified = dateModified;
+                this.IsClass = isClass;
+                this.ClassId = classId;
+                this.ParentCategoryId = parentCategoryId;
+                this.DisplayIndex = displayIndex;
+            }
+
+            public int Id { get; }
+            public int GameId { get; }
+            public string Name { get; }
+            public string Slug { get; }
+            public string Url { get; }
+            public string IconUrl { get; }
+            public DateTime DateModified { get; }
+            public bool IsClass { get; }
+            public int ClassId { get; }
+            public int ParentCategoryId { get; }
+            public int DisplayIndex { get; }
+        }
+    }
+
+
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Files/FilesAPI.cs b/CFCoreAPI/Endpoints/Files/FilesAPI.cs
index d5718ba..8be90f8 100644
--- a/CFCoreAPI/Endpoints/Files/FilesAPI.cs
+++ b/CFCoreAPI/Endpoints/Files/FilesAPI.cs
@@ -1,4 +1,5 @@
 using System.Text.Json;
+using CFCoreAPI.Endpoints.Files.Requests;
 using CFCoreAPI.Endpoints.Files.Responses;
 using Microsoft.AspNetCore.WebUtilities;
 
@@ -34,8 +35,8 @@ namespace CFCoreAPI.Endpoints.Files
             if (index != null) QueryHelpers.AddQueryString(url, "index", index.ToString());
             if (pageSize != null) QueryHelpers.AddQueryString(url, "pageSize", pageSize.ToString());
             HttpResponseMessage response = await httpClient.GetAsync(url);
-            ModFilesResponse result;
 
+            ModFilesResponse result;
             using (Stream contentStream = await response.Content.ReadAsStreamAsync())
             {
                 result = await JsonSerializer.DeserializeAsync<ModFilesResponse>(contentStream);
@@ -43,5 +44,46 @@ namespace CFCoreAPI.Endpoints.Files
             return result;
         }
 
+        public async Task<FileResponse> GetFilesAsync(ModFilesRequest request)
+        {
+            string url = "/v1/mods/files";
+            HttpContent content = new StringContent(JsonSerializer.Serialize(request));
+            HttpResponseMessage response = await httpClient.PostAsync(url, content);
+
+            FileResponse result;
+            using (Stream contentStream = await response.Content.ReadAsStreamAsync())
+            {
+                result = await JsonSerializer.DeserializeAsync<FileResponse>(contentStream);
+            }
+            return result;
+        }
+
+        public async Task<StringResponse> GetModFileChangelog(int modId, int field)
+        {
+            string url = "/v1/mods/{0}/files/{1}/changelog";
+            string.Format(url, modId, field);
+            HttpResponseMessage response = await httpClient.GetAsync(url);
+
+            StringResponse result;
+            using (Stream contentStream = await response.Content.ReadAsStreamAsync())
+            {
+                result = await JsonSerializer.DeserializeAsync<StringResponse>(contentStream);
+            }
+            return result;
+        }
+
+        public async Task<StringResponse> GetModFileDownloadURL(int modId, int field)
+        {
+            string url = "/v1/mods/{0}/files/{1}/download-url";
+            string.Format(url, modId, field);
+            HttpResponseMessage response = await httpClient.GetAsync(url);
+
+            StringResponse result;
+            using (Stream contentStream = await response.Content.ReadAsStreamAsync())
+            {
+                result = await JsonSerializer.DeserializeAsync<StringResponse>(contentStream);
+            }
+            return result;
+        }
     }
 }
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Files/Requests/ModFilesRequest.cs b/CFCoreAPI/Endpoints/Files/Requests/ModFilesRequest.cs
new file mode 100644
index 0000000..dded31b
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Files/Requests/ModFilesRequest.cs
@@ -0,0 +1,19 @@
+using System.Text.Json.Serialization;
+
+namespace CFCoreAPI.Endpoints.Files.Requests
+{
+    public class ModFilesRequest
+    {
+        [JsonConstructor]
+        public ModFilesRequest(
+            List<int> modIds
+        )
+        {
+            this.ModIds = modIds;
+        }
+
+        public IReadOnlyList<int> ModIds { get; }
+    }
+
+
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Files/Responses/FileResponse.cs b/CFCoreAPI/Endpoints/Files/Responses/FileResponse.cs
new file mode 100644
index 0000000..9cdca65
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Files/Responses/FileResponse.cs
@@ -0,0 +1,172 @@
+using System.Text.Json.Serialization;
+
+namespace CFCoreAPI.Endpoints.Files.Responses
+{
+    public struct FileResponse
+    {
+        [JsonConstructor]
+        public FileResponse(
+            List<DataModel> data
+        )
+        {
+            this.Data = data;
+        }
+
+        public IReadOnlyList<DataModel> Data { get; }
+
+        public struct DataModel
+        {
+            [JsonConstructor]
+            public DataModel(
+                int id,
+                int gameId,
+                int modId,
+                bool isAvailable,
+                string displayName,
+                string fileName,
+                int releaseType,
+                int fileStatus,
+                List<HashModel> hashes,
+                DateTime fileDate,
+                int fileLength,
+                int downloadCount,
+                string downloadUrl,
+                List<string> gameVersions,
+                List<SortableGameVersion> sortableGameVersions,
+                List<DependencyModel> dependencies,
+                bool exposeAsAlternative,
+                int parentProjectFileId,
+                int alternateFileId,
+                bool isServerPack,
+                int serverPackFileId,
+                int fileFingerprint,
+                List<ModuleModel> modules
+            )
+            {
+                this.Id = id;
+                this.GameId = gameId;
+                this.ModId = modId;
+                this.IsAvailable = isAvailable;
+                this.DisplayName = displayName;
+                this.FileName = fileName;
+                this.ReleaseType = releaseType;
+                this.FileStatus = fileStatus;
+                this.Hashes = hashes;
+                this.FileDate = fileDate;
+                this.FileLength = fileLength;
+                this.DownloadCount = downloadCount;
+                this.DownloadUrl = downloadUrl;
+                this.GameVersions = gameVersions;
+                this.SortableGameVersions = sortableGameVersions;
+                this.Dependencies = dependencies;
+                this.ExposeAsAlternative = exposeAsAlternative;
+                this.ParentProjectFileId = parentProjectFileId;
+                this.AlternateFileId = alternateFileId;
+                this.IsServerPack = isServerPack;
+                this.ServerPackFileId = serverPackFileId;
+                this.FileFingerprint = fileFingerprint;
+                this.Modules = modules;
+            }
+
+            public int Id { get; }
+            public int GameId { get; }
+            public int ModId { get; }
+            public bool IsAvailable { get; }
+            public string DisplayName { get; }
+            public string FileName { get; }
+            public int ReleaseType { get; }
+            public int FileStatus { get; }
+            public IReadOnlyList<HashModel> Hashes { get; }
+            public DateTime FileDate { get; }
+            public int FileLength { get; }
+            public int DownloadCount { get; }
+            public string DownloadUrl { get; }
+            public IReadOnlyList<string> GameVersions { get; }
+            public IReadOnlyList<SortableGameVersion> SortableGameVersions { get; }
+            public IReadOnlyList<DependencyModel> Dependencies { get; }
+            public bool ExposeAsAlternative { get; }
+            public int ParentProjectFileId { get; }
+            public int AlternateFileId { get; }
+            public bool IsServerPack { get; }
+            public int ServerPackFileId { get; }
+            public int FileFingerprint { get; }
+            public IReadOnlyList<ModuleModel> Modules { get; }
+        }
+
+        public struct DependencyModel
+        {
+            [JsonConstructor]
+            public DependencyModel(
+                int modId,
+                int relationType
+            )
+            {
+                this.ModId = modId;
+                this.RelationType = relationType;
+            }
+
+            public int ModId { get; }
+            public int RelationType { get; }
+        }
+
+        public struct HashModel
+        {
+            [JsonConstructor]
+            public HashModel(
+                string value,
+                int algo
+            )
+            {
+                this.Value = value;
+                this.Algo = algo;
+            }
+
+            public string Value { get; }
+            public int Algo { get; }
+        }
+
+        public struct ModuleModel
+        {
+            [JsonConstructor]
+            public ModuleModel(
+                string name,
+                int fingerprint
+            )
+            {
+                this.Name = name;
+                this.Fingerprint = fingerprint;
+            }
+
+            public string Name { get; }
+            public int Fingerprint { get; }
+        }
+
+        public struct SortableGameVersion
+        {
+            [JsonConstructor]
+            public SortableGameVersion(
+                string gameVersionName,
+                string gameVersionPadded,
+                string gameVersion,
+                DateTime gameVersionReleaseDate,
+                int gameVersionTypeId
+            )
+            {
+                this.GameVersionName = gameVersionName;
+                this.GameVersionPadded = gameVersionPadded;
+                this.GameVersion = gameVersion;
+                this.GameVersionReleaseDate = gameVersionReleaseDate;
+                this.GameVersionTypeId = gameVersionTypeId;
+            }
+
+            public string GameVersionName { get; }
+            public string GameVersionPadded { get; }
+            public string GameVersion { get; }
+            public DateTime GameVersionReleaseDate { get; }
+            public int GameVersionTypeId { get; }
+        }
+    }
+
+
+
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Fingerprints/FingerprintsAPI.cs b/CFCoreAPI/Endpoints/Fingerprints/FingerprintsAPI.cs
new file mode 100644
index 0000000..f64aff3
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Fingerprints/FingerprintsAPI.cs
@@ -0,0 +1,10 @@
+namespace CFCoreAPI.Endpoints.Fingerprints
+{
+    public class FingerprintsAPI : APIBase
+    {
+        public FingerprintsAPI(HttpClient httpClient) : base(httpClient)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Minecraft/MinecraftAPI.cs b/CFCoreAPI/Endpoints/Minecraft/MinecraftAPI.cs
new file mode 100644
index 0000000..cdc4cb3
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Minecraft/MinecraftAPI.cs
@@ -0,0 +1,10 @@
+namespace CFCoreAPI.Endpoints.Minecraft
+{
+    public class MinecraftAPI : APIBase
+    {
+        public MinecraftAPI(HttpClient httpClient) : base(httpClient)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Mods/ModsAPI.cs b/CFCoreAPI/Endpoints/Mods/ModsAPI.cs
new file mode 100644
index 0000000..663112f
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Mods/ModsAPI.cs
@@ -0,0 +1,10 @@
+namespace CFCoreAPI.Endpoints.Mods
+{
+    public class ModsAPI : APIBase
+    {
+        public ModsAPI(HttpClient httpClient) : base(httpClient)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/CFCoreAPI/Endpoints/Responses/StringResponse.cs b/CFCoreAPI/Endpoints/Responses/StringResponse.cs
new file mode 100644
index 0000000..9dc3d3b
--- /dev/null
+++ b/CFCoreAPI/Endpoints/Responses/StringResponse.cs
@@ -0,0 +1,17 @@
+using System.Text.Json.Serialization;
+
+namespace CFCoreAPI.Endpoints.Files.Responses
+{
+    public struct StringResponse
+    {
+        [JsonConstructor]
+        public StringResponse(
+            string data
+        )
+        {
+            this.Data = data;
+        }
+
+        public string Data { get; }
+    }
+}
\ No newline at end of file