diff --git a/.phase5-state.json b/.phase5-state.json
index 8199c64..0f56e26 100644
--- a/.phase5-state.json
+++ b/.phase5-state.json
@@ -4,6 +4,9 @@
     "customer-detail-page",
     "project-detail-page"
   ],
-  "current_feature": "settings-page",
-  "started_at": "2026-05-23T05:20:11.407108"
+  "current_feature": "api-client-phase5",
+  "started_at": "2026-05-23T05:20:11.407108",
+  "attempted_features": [
+    "settings-page"
+  ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 625eeee..a700c80 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -589,3 +589,17 @@ src/routes/settings.ts(3,10): error TS2305: Module '"../db/schema"' has no expor
 undefined
 /home/dark/Developer/EmberClone/apps/api:
  ERR_PNPM_RECURSIVE_EXEC_FIRST_FAIL  Command failed with exit code 2: tsc --noEmit -p tsconfig.json
+- `05:24:10` **INFO**   Committed feature settings-page
+- `05:24:11` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: api-client-phase5 (2026-05-23 05:24:11)
+
+- `05:24:11` **INFO** Description: API um customer-detail, project-detail, settings, theme erweitern
+- `05:24:11` **INFO**   Generating apps/web/src/lib/api.ts (ERWEITERT — behalte ALLES. Füge: getCustomerProjects(id), getCustomerT…)
+- `05:24:50` **INFO**     wrote 4448 chars in 38.9s (attempt 1)
+- `05:24:50` **INFO** Running tsc --noEmit on api…
+- `05:24:51` **WARN**   tsc errors:
+src/routes/settings.ts(3,10): error TS2305: Module '"../db/schema"' has no exported member 'settings'.
+undefined
+/home/dark/Developer/EmberClone/apps/api:
+ ERR_PNPM_RECURSIVE_EXEC_FIRST_FAIL  Command failed with exit code 2: tsc --noEmit -p tsconfig.json
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 2b3f54e..18b86e3 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -113,11 +113,23 @@ export const api = {
     })
   },
 
+  async getCustomerProjects(customerId: string) {
+    return request<any[]>(`/customers/${customerId}/projects`)
+  },
+
+  async getCustomerTimeEntries(customerId: string) {
+    return request<any[]>(`/customers/${customerId}/time-entries`)
+  },
+
   async listProjects(opts?: Record<string, string>) {
     const query = opts ? `?${new URLSearchParams(opts).toString()}` : ""
     return request<any[]>(`/projects${query}`)
   },
 
+  async getProject(id: string) {
+    return request<any>(`/projects/${id}`)
+  },
+
   async createProject(data: Partial<ProjectInsert>) {
     return request("/projects", {
       method: "POST",
@@ -153,5 +165,16 @@ export const api = {
     return request(`/users/${id}`, {
       method: "DELETE"
     })
+  },
+
+  async getSettings() {
+    return request<any>("/settings")
+  },
+
+  async updateSettings(data: { workspaceName?: string; defaultBillable?: boolean; weekStart?: number }) {
+    return request("/settings", {
+      method: "PATCH",
+      body: JSON.stringify(data)
+    })
   }
 }
\ No newline at end of file