diff --git a/backend/routes/osm.py b/backend/routes/osm.py
index 7c1cd58..2c7375b 100644
--- a/backend/routes/osm.py
+++ b/backend/routes/osm.py
@@ -24,8 +24,11 @@ OVERPASS_URLS = [
     'https://overpass-api.de/api/interpreter',
 ]
 
-# Globales Limit: max 2 gleichzeitige Overpass-Anfragen (Prewarm + User geteilt)
-_overpass_sem = asyncio.Semaphore(2)
+# Max 1 gleichzeitige Overpass-Anfrage + 2s Mindestabstand (Fair Use)
+_overpass_sem       = asyncio.Semaphore(1)
+_overpass_last_req  = 0.0
+_OVERPASS_MIN_DELAY = 2.0  # Sekunden zwischen Anfragen
+_OVERPASS_UA        = 'BanYaro/1.0 (https://banyaro.app; dog-walking PWA; contact: mail@motocamp.de)'
 
 OSM_QUERIES = {
     'waste_basket':   '[out:json][timeout:20];node["amenity"="waste_basket"]({bbox});out;',
@@ -68,12 +71,22 @@ def _covering_tiles(south, west, north, east, zoom):
 # Overpass-Fetch + Cache
 # ------------------------------------------------------------------
 async def _fetch_overpass(query):
+    global _overpass_last_req
     for url in OVERPASS_URLS:
         for attempt in range(2):
             try:
                 async with _overpass_sem:
-                    async with httpx.AsyncClient(timeout=40) as client:
+                    # Fair-Use: Mindestabstand zwischen Anfragen einhalten
+                    import time
+                    wait = _OVERPASS_MIN_DELAY - (time.monotonic() - _overpass_last_req)
+                    if wait > 0:
+                        await asyncio.sleep(wait)
+                    async with httpx.AsyncClient(
+                        timeout=40,
+                        headers={'User-Agent': _OVERPASS_UA},
+                    ) as client:
                         r = await client.post(url, data={'data': query})
+                    _overpass_last_req = time.monotonic()
                 if r.status_code == 200:
                     return r.json().get('elements', [])
                 if r.status_code == 429: