diff --git a/music-lab/app/main.py b/music-lab/app/main.py
index 0520190..784c2b4 100644
--- a/music-lab/app/main.py
+++ b/music-lab/app/main.py
@@ -2,8 +2,8 @@ import json
 import os
 import shutil
 import uuid
-from typing import List, Optional
-from fastapi import FastAPI, HTTPException, BackgroundTasks
+from typing import Any, Dict, List, Optional
+from fastapi import FastAPI, HTTPException, BackgroundTasks, Query
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 
@@ -819,7 +819,7 @@ def remove_revenue(record_id: int):
 # ── 시장 조사 API ─────────────────────────────────────────────────────────────
 
 class MarketIngestRequest(BaseModel):
-    trends: list
+    trends: List[Dict[str, Any]]
     report_date: str = ""
 
 
@@ -837,7 +837,7 @@ def list_market_trends(
     country: Optional[str] = None,
     genre: Optional[str] = None,
     source: Optional[str] = None,
-    days: int = 7,
+    days: int = Query(7, ge=1),
 ):
     return {"trends": _get_market_trends(country, genre, source, days)}
 
diff --git a/music-lab/app/market.py b/music-lab/app/market.py
index f108526..69c6c79 100644
--- a/music-lab/app/market.py
+++ b/music-lab/app/market.py
@@ -8,8 +8,6 @@ from .db import (
     insert_market_trends, upsert_trend_report,
 )
 
-ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY", "")
-
 GENRE_PROMPTS: Dict[str, str] = {
     "lo-fi":   "lo-fi hip hop, chill, relaxing beats, study music, 85 BPM, jazzy chords",
     "phonk":   "dark phonk, aggressive 808 bass, Memphis trap, distorted synths, 140 BPM",
@@ -71,14 +69,15 @@ def _build_report(trends: List[Dict[str, Any]], report_date: str) -> Dict[str, A
 
 
 def _generate_insights(top_genres: list, top_keywords: list) -> str:
+    api_key = os.getenv("ANTHROPIC_API_KEY", "")
     if not top_genres:
         return "아직 수집된 트렌드 데이터가 없습니다."
-    if not ANTHROPIC_API_KEY:
+    if not api_key:
         names = ", ".join(g["genre"] for g in top_genres[:3])
         return f"이번 주 인기 장르: {names}. 해당 장르 중심 제작을 추천합니다."
 
     import anthropic
-    client = anthropic.Anthropic(api_key=ANTHROPIC_API_KEY)
+    client = anthropic.Anthropic(api_key=api_key)
     genre_str = ", ".join(f"{g['genre']}({g['score']:.1f})" for g in top_genres[:5])
     kw_str    = ", ".join(top_keywords[:10])
     try:
diff --git a/music-lab/tests/test_market.py b/music-lab/tests/test_market.py
index d62ebbe..8d0e82b 100644
--- a/music-lab/tests/test_market.py
+++ b/music-lab/tests/test_market.py
@@ -35,3 +35,65 @@ def test_ingest_idempotent(tmp_db):
 
     reports = get_trend_reports()
     assert len([r for r in reports if r["report_date"] == "2026-05-01"]) == 1
+
+
+from fastapi.testclient import TestClient
+
+
+def test_market_endpoints_empty(tmp_db):
+    """Empty DB: /report/latest returns 404, /suggest returns []."""
+    from app.db import init_db
+    init_db()
+    from app.main import app
+    client = TestClient(app)
+
+    resp = client.get("/api/music/market/report/latest")
+    assert resp.status_code == 404
+
+    resp = client.get("/api/music/market/suggest")
+    assert resp.status_code == 200
+    assert resp.json()["suggestions"] == []
+
+
+def test_market_ingest_endpoint(tmp_db):
+    """POST /ingest returns ok, GET /report/latest returns report, GET /trends returns data."""
+    from app.db import init_db
+    init_db()
+    from app.main import app
+    client = TestClient(app)
+
+    payload = {
+        "trends": [
+            {"source": "youtube", "country": "BR", "genre": "lo-fi",
+             "keyword": "lofi", "score": 0.9, "rank": 1, "metadata": {}},
+        ],
+        "report_date": "2026-05-01",
+    }
+    resp = client.post("/api/music/market/ingest", json=payload)
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["ok"] is True
+    assert data["trends_saved"] == 1
+    assert data["report_date"] == "2026-05-01"
+
+    resp = client.get("/api/music/market/report/latest")
+    assert resp.status_code == 200
+    assert resp.json()["report_date"] == "2026-05-01"
+
+    resp = client.get("/api/music/market/trends")
+    assert resp.status_code == 200
+    assert len(resp.json()["trends"]) == 1
+
+
+def test_ingest_empty_trends(tmp_db):
+    """Empty trends list ingests without error and returns a well-formed report."""
+    from app.db import init_db
+    from app.market import ingest_trends
+    init_db()
+
+    report = ingest_trends([], "2026-05-02")
+    assert report["report_date"] == "2026-05-02"
+    assert report["top_genres"] == []
+    assert report["recommended_styles"] == []
+    assert isinstance(report["insights"], str)
+    assert len(report["insights"]) > 0