diff --git a/.phase20-state.json b/.phase20-state.json
index 5a68f86..f9dece0 100644
--- a/.phase20-state.json
+++ b/.phase20-state.json
@@ -1,11 +1,12 @@
 {
   "completed_features": [],
-  "current_feature": "budget-alerts",
+  "current_feature": "api-client-phase20",
   "started_at": "2026-05-23T07:57:43.412201",
   "attempted_features": [
     "time-budget-per-project",
     "recurring-time-entries",
     "slack-integration-stub",
-    "github-link-on-entries"
+    "github-link-on-entries",
+    "budget-alerts"
   ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 0b3dae0..7d258c1 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -2458,3 +2458,20 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
+- `08:08:01` **INFO**   Committed feature budget-alerts
+- `08:08:01` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: api-client-phase20 (2026-05-23 08:08:01)
+
+- `08:08:01` **INFO** Description: API: pinned-customers + budget-update Endpoints
+- `08:08:01` **INFO**   Generating apps/web/src/lib/api.ts (ERWEITERT — behalte ALLES. Füge: updateProjectBudget(id, hours), setEx…)
+- `08:08:43` **INFO**     wrote 4748 chars in 41.4s (attempt 1)
+- `08:08:43` **INFO** Running tsc --noEmit on api…
+- `08:08:44` **WARN**   tsc errors:
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProvider>, opts: { ...; }, done: (err?: Error | undefined) => void): void'.
+  Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 757826d..3761437 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -166,31 +166,24 @@ export const api = {
     })
   },
 
-  async createInvitation(data: { email: string; role: "admin" | "user" }) {
-    return request("/invitations", {
+  async updateProjectBudget(id: string, hours: number) {
+    return request(`/projects/${id}/budget`, {
+      method: "PATCH",
+      body: JSON.stringify({ hours })
+    })
+  },
+
+  async setExternalLink(entryId: string, url: string) {
+    return request(`/time-entries/${entryId}/external-link`, {
+      method: "PATCH",
+      body: JSON.stringify({ url })
+    })
+  },
+
+  async testSlackWebhook(url: string) {
+    return request("/integrations/slack/test", {
       method: "POST",
-      body: JSON.stringify(data)
+      body: JSON.stringify({ url, text: "Hello from EmberClone" })
     })
-  },
-
-  async listInvitations() {
-    return request<any[]>("/invitations")
-  },
-
-  async deleteInvitation(id: string) {
-    return request(`/invitations/${id}`, {
-      method: "DELETE"
-    })
-  },
-
-  async acceptInvite(token: string, name: string, password: string) {
-    return request("/invitations/accept", {
-      method: "POST",
-      body: JSON.stringify({ token, name, password })
-    })
-  },
-
-  async getPresence() {
-    return request<any[]>("/presence")
   }
 }
\ No newline at end of file