diff --git a/src/api/request.ts b/src/api/request.ts
index bc9d1bf..6d7263e 100644
--- a/src/api/request.ts
+++ b/src/api/request.ts
@@ -107,3 +107,28 @@ export async function post<T = unknown>(
   }
   return res.json() as Promise<T>
 }
+
+/**
+ * 带 x-token 等自定义头的 PUT 请求
+ */
+export async function put<T = unknown>(
+  path: string,
+  body?: unknown,
+  config?: RequestConfig,
+): Promise<T> {
+  const url = new URL(path, BASE_URL || window.location.origin)
+  const headers: Record<string, string> = {
+    'Content-Type': 'application/json',
+    'Accept-Language': i18n.global.locale.value as string,
+    ...config?.headers,
+  }
+  const res = await fetch(url.toString(), {
+    method: 'PUT',
+    headers,
+    body: body !== undefined ? JSON.stringify(body) : undefined,
+  })
+  if (!res.ok) {
+    throw new Error(`HTTP ${res.status}: ${res.statusText}`)
+  }
+  return res.json() as Promise<T>
+}
diff --git a/src/api/user.ts b/src/api/user.ts
index 550a81b..4e6c973 100644
--- a/src/api/user.ts
+++ b/src/api/user.ts
@@ -1,4 +1,5 @@
-import { get } from './request'
+import { get, put } from './request'
+import type { ApiResponse } from './types'
 
 const USDC_DECIMALS = 1_000_000
 
@@ -123,3 +124,22 @@ export async function getUsdcBalance(
   })
   return res
 }
+
+/**
+ * PUT /user/setSelfUsername
+ * 修改自身用户名
+ * Body: { username: string }
+ * 需鉴权（ApiKeyAuth）
+ */
+export interface ChangeSelfUsernameReq {
+  username: string
+}
+
+export async function setSelfUsername(
+  authHeaders: Record<string, string>,
+  req: ChangeSelfUsernameReq,
+): Promise<ApiResponse> {
+  return put<ApiResponse>('/user/setSelfUsername', req, {
+    headers: authHeaders,
+  })
+}