diff --git a/frontend/src/services/decisionService.ts b/frontend/src/services/decisionService.ts
new file mode 100644
index 0000000..db16dee
--- /dev/null
+++ b/frontend/src/services/decisionService.ts
@@ -0,0 +1,32 @@
+// Decision API service for managing listing decisions (like/dislike)
+
+import type { AuthUser } from '@/auth/types';
+import type { ListingDecision } from '@/types';
+import { apiRequest } from './apiClient';
+
+export async function fetchDecisions(user: AuthUser): Promise<ListingDecision[]> {
+  return apiRequest<ListingDecision[]>(user, '/api/decisions');
+}
+
+export async function setDecision(
+  user: AuthUser,
+  listingId: number,
+  decision: 'liked' | 'disliked',
+  listingType: 'RENT' | 'BUY' = 'RENT',
+): Promise<ListingDecision> {
+  return apiRequest<ListingDecision>(user, `/api/decisions/${listingId}`, {
+    method: 'PUT',
+    body: { decision, listing_type: listingType },
+  });
+}
+
+export async function clearDecision(
+  user: AuthUser,
+  listingId: number,
+  listingType: 'RENT' | 'BUY' = 'RENT',
+): Promise<void> {
+  await apiRequest(user, `/api/decisions/${listingId}`, {
+    method: 'DELETE',
+    params: { listing_type: listingType },
+  });
+}
diff --git a/frontend/src/services/index.ts b/frontend/src/services/index.ts
index 775123c..25113bc 100644
--- a/frontend/src/services/index.ts
+++ b/frontend/src/services/index.ts
@@ -5,3 +5,4 @@ export { streamListingGeoJSON, type StreamingProgress } from './streamingService
 export { fetchTasksForUser, fetchTaskStatus, cancelTask, clearAllTasks, type CancelTaskResponse, type ClearAllTasksResponse } from './taskService';
 export { checkBackendHealth, type HealthStatus, type HealthCheckResult } from './healthService';
 export { fetchUserPOIs, createPOI, updatePOI, deletePOI, triggerPOICalculation, fetchPOIDistances } from './poiService';
+export { fetchDecisions, setDecision, clearDecision } from './decisionService';
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index aa2e51b..163eee1 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -178,3 +178,15 @@ export interface WSPongMessage {
 }
 
 export type WSMessage = WSInitMessage | WSTaskUpdateMessage | WSPongMessage;
+
+// Decision types
+export type DecisionType = 'liked' | 'disliked';
+
+export interface ListingDecision {
+  id: number;
+  listing_id: number;
+  listing_type: 'RENT' | 'BUY';
+  decision: DecisionType;
+  created_at: string;
+  updated_at: string;
+}