diff --git a/src/api/problem.ts b/src/api/problem.ts
index 4ff23a7..7ad7711 100644
--- a/src/api/problem.ts
+++ b/src/api/problem.ts
@@ -50,23 +50,26 @@ export interface UploadResp {
 }
 
 export class ProblemApi {
-    async CreateVersion(data: CreateVersionReq, token: string): Promise<void> {
+    static async CreateVersion(
+        data: CreateVersionReq,
+        token: string,
+    ): Promise<void> {
         return send("/problem/create_version", data, token);
     }
 
-    async Details(data: DetailsReq): Promise<DetailsResp> {
+    static async Details(data: DetailsReq): Promise<DetailsResp> {
         return send("/problem/details", data);
     }
 
-    async Search(data: SearchReq): Promise<ProblemInfo[]> {
+    static async Search(data: SearchReq): Promise<ProblemInfo[]> {
         return send("/problem/search", data);
     }
 
-    async Update(data: UpdateReq, token: string): Promise<ProblemInfo> {
+    static async Update(data: UpdateReq, token: string): Promise<ProblemInfo> {
         return send("/problem/update", data, token);
     }
 
-    async Upload(token: string): Promise<UploadResp> {
+    static async Upload(token: string): Promise<UploadResp> {
         return send("/problem/upload", null, token);
     }
 }
diff --git a/src/api/status.ts b/src/api/status.ts
index 358c863..2b6e2f6 100644
--- a/src/api/status.ts
+++ b/src/api/status.ts
@@ -48,11 +48,11 @@ export interface QueryResp {
 }
 
 export class StatusApi {
-    async Query(data: QueryReq): Promise<QueryResp> {
+    static async Query(data: QueryReq): Promise<QueryResp> {
         return send("/status/query", data);
     }
 
-    async QueryByVersion(
+    static async QueryByVersion(
         data: QueryByVersionReq,
         token: string,
     ): Promise<QueryResp[]> {
diff --git a/src/api/submission.ts b/src/api/submission.ts
index 7197465..56d0a58 100644
--- a/src/api/submission.ts
+++ b/src/api/submission.ts
@@ -32,18 +32,18 @@ export interface ReJudgeReq {
 }
 
 export class SubmissionApi {
-    async Create(data: SubmitReq, token: string): Promise<void> {
+    static async Create(data: SubmitReq, token: string): Promise<void> {
         return send("/submission/create", data, token);
     }
 
-    async Query(data: QueryReq, token: string): Promise<QueryResp[]> {
+    static async Query(data: QueryReq, token: string): Promise<QueryResp[]> {
         if (!data.pid && !data.uid) {
             throw new Error("Missing required fields");
         }
         return send("/submission/query", data, token);
     }
 
-    async ReJudge(data: ReJudgeReq, token: string): Promise<void> {
+    static async ReJudge(data: ReJudgeReq, token: string): Promise<void> {
         return send("/submission/rejudge", data, token);
     }
 }
diff --git a/src/api/user.ts b/src/api/user.ts
index d384668..b504ae3 100644
--- a/src/api/user.ts
+++ b/src/api/user.ts
@@ -16,25 +16,25 @@ export interface UserProfile {
 }
 
 export class UserApi {
-    async Create(data: UserReq): Promise<string> {
+    static async Create(data: UserReq): Promise<string> {
         if (!data.username || !data.password || !data.nickname) {
             throw new Error("Missing required fields");
         }
         return send("/user/create", data);
     }
 
-    async Login(data: UserReq): Promise<string> {
+    static async Login(data: UserReq): Promise<string> {
         if (!data.username || !data.password) {
             throw new Error("Missing required fields");
         }
         return send("/user/login", data);
     }
 
-    async Logout(token: string): Promise<void> {
+    static async Logout(token: string): Promise<void> {
         return send("/user/logout", null, token);
     }
 
-    async Profile(data: UserReq, token: string): Promise<UserProfile> {
+    static async Profile(data: UserReq, token: string): Promise<UserProfile> {
         return send("/user/profile", data, token);
     }
 }