diff --git a/src/app/services/api.ts b/src/app/services/api.ts
index b64978f..a326069 100644
--- a/src/app/services/api.ts
+++ b/src/app/services/api.ts
@@ -15,6 +15,6 @@ const baseQuery = fetchBaseQuery({
 
 export const api = createApi({
     baseQuery: retry(baseQuery, { maxRetries: 2 }),
-    tagTypes: ["User", "Status", "Submission"],
+    tagTypes: ["User", "Status", "Submission", "ProblemInfo", "TaskInfo"],
     endpoints: () => ({}),
 });
diff --git a/src/app/services/problem.ts b/src/app/services/problem.ts
new file mode 100644
index 0000000..0a6d6d7
--- /dev/null
+++ b/src/app/services/problem.ts
@@ -0,0 +1,96 @@
+import type { Meta, WithCount, Wrap } from "./base";
+import type { UserProfile } from "./user";
+import { api } from "./api";
+
+export interface RuntimeInfo {
+    MemoryLimit: number;
+    NProcLimit: number;
+    TimeLimit: number;
+}
+
+export interface TaskInfo {
+    Languages: {
+        Lang: string;
+        Runtime: {
+            Compile: RuntimeInfo;
+            Run: RuntimeInfo;
+        };
+    }[];
+    Tasks: { Id: number; Points: number }[];
+}
+
+export interface ProblemInfo {
+    meta: Meta;
+    title: string;
+    statement: string;
+    tags: { Elements: string[] };
+    provider: UserProfile;
+    is_enabled: boolean;
+}
+
+export interface CreateVersionRequest {
+    pid: number;
+    storage_key: string;
+}
+
+export interface DetailRequest {
+    pid: number;
+}
+
+export interface DetailResponse {
+    context: TaskInfo;
+    problem: ProblemInfo;
+}
+
+export interface SearchRequest {
+    keyword: string;
+    tag: string;
+    offset?: number;
+    limit: number;
+}
+
+export type SearchResponse = WithCount<ProblemInfo>;
+
+export interface UpdateRequest {
+    pid: number;
+    title: string;
+    statement: string;
+    tags: string[];
+    is_enabled: boolean;
+}
+
+export interface UploadResponse {
+    key: string;
+    url: string;
+}
+
+export const problemApi = api.injectEndpoints({
+    endpoints: (builder) => ({
+        search: builder.query<Wrap<SearchResponse>, SearchRequest>({
+            query: (data: SearchRequest) => ({
+                url: "/problem/search",
+                method: "POST",
+                body: data,
+            }),
+            providesTags: (result) =>
+                result && result.body.count > 0
+                    ? [
+                          ...result.body.data.map((p: ProblemInfo) => ({
+                              type: "ProblemInfo" as const,
+                              id: p.meta.ID,
+                          })),
+                          { type: "ProblemInfo", id: "Search" },
+                      ]
+                    : [{ type: "ProblemInfo", id: "Search" }],
+        }),
+        detail: builder.query<Wrap<DetailResponse>, DetailRequest>({
+            query: (data: DetailRequest) => ({
+                url: "/problem/search",
+                method: "POST",
+                body: data,
+            }),
+            providesTags: (result) => (result ? [{ type: "TaskInfo", id: result.body.problem.meta.ID }] : []),
+        }),
+        // TODO: admin endpoints: version, update, upload
+    }),
+});