diff --git a/routes/deckbuilder.py b/routes/deckbuilder.py
new file mode 100644
index 0000000..04a91db
--- /dev/null
+++ b/routes/deckbuilder.py
@@ -0,0 +1,155 @@
+"""
+routes/deckbuilder.py
+=====================
+Deck Builder endpoints:
+  POST   /api/decks
+  GET    /api/decks
+  GET    /api/decks/{deck_id}
+  PUT    /api/decks/{deck_id}
+  DELETE /api/decks/{deck_id}
+  DELETE /api/decks
+  GET    /api/decks/{deck_id}/cards
+  POST   /api/decks/{deck_id}/cards
+  DELETE /api/decks/{deck_id}/cards/{card_id}
+  PATCH  /api/decks/{deck_id}/cards/{card_id}
+  GET    /api/decks/{deck_id}/analysis
+  GET    /api/decks/{deck_id}/recommended-from-collection
+  GET    /api/decks/{deck_id}/edh-recs
+  POST   /api/decks/{deck_id}/bulk-add
+  POST   /api/decks/{deck_id}/bulk-add-recommended
+  POST   /api/decks/{deck_id}/export-to-sim
+"""
+
+from __future__ import annotations
+
+from typing import Optional
+
+from fastapi import APIRouter
+
+from routes.shared import get as _get
+
+router = APIRouter(prefix="/api/decks", tags=["deckbuilder"])
+
+
+# ---------------------------------------------------------------------------
+# Deck CRUD
+# ---------------------------------------------------------------------------
+
+@router.post("")
+async def create_deck(body: dict):
+    fn = _get("create_deck")
+    return await fn(body)
+
+
+@router.get("")
+async def list_decks_db():
+    fn = _get("list_decks_db")
+    return await fn()
+
+
+@router.get("/{deck_id}")
+async def get_deck(deck_id: int):
+    fn = _get("get_deck")
+    return await fn(deck_id)
+
+
+@router.put("/{deck_id}")
+async def update_deck(deck_id: int, body: dict):
+    fn = _get("update_deck")
+    return await fn(deck_id, body)
+
+
+@router.delete("/{deck_id}")
+async def delete_deck(deck_id: int):
+    fn = _get("delete_deck")
+    return await fn(deck_id)
+
+
+@router.delete("")
+async def delete_all_decks():
+    fn = _get("delete_all_decks")
+    return await fn()
+
+
+# ---------------------------------------------------------------------------
+# Deck card manipulation
+# ---------------------------------------------------------------------------
+
+@router.get("/{deck_id}/cards")
+async def get_deck_cards(deck_id: int):
+    fn = _get("get_deck_cards")
+    return await fn(deck_id)
+
+
+@router.post("/{deck_id}/cards")
+async def add_deck_card(deck_id: int, body: dict):
+    fn = _get("add_deck_card")
+    return await fn(deck_id, body)
+
+
+@router.delete("/{deck_id}/cards/{card_id}")
+async def remove_deck_card(deck_id: int, card_id: int):
+    fn = _get("remove_deck_card")
+    return await fn(deck_id, card_id)
+
+
+@router.patch("/{deck_id}/cards/{card_id}")
+async def patch_deck_card(deck_id: int, card_id: int, body: dict):
+    fn = _get("patch_deck_card")
+    return await fn(deck_id, card_id, body)
+
+
+# ---------------------------------------------------------------------------
+# Analysis + recommendations
+# ---------------------------------------------------------------------------
+
+@router.get("/{deck_id}/analysis")
+async def deck_analysis(deck_id: int):
+    fn = _get("deck_analysis")
+    return await fn(deck_id)
+
+
+@router.get("/{deck_id}/recommended-from-collection")
+async def recommend_from_collection(
+    deck_id: int,
+    max_results: int = 20,
+    roles: Optional[str] = None,
+):
+    fn = _get("recommend_from_collection")
+    return await fn(deck_id, max_results=max_results, roles=roles)
+
+
+@router.get("/{deck_id}/edh-recs")
+async def deck_edh_recs(
+    deck_id: int,
+    only_owned: bool = False,
+    max_results: int = 30,
+):
+    fn = _get("deck_edh_recs")
+    return await fn(deck_id, only_owned=only_owned, max_results=max_results)
+
+
+# ---------------------------------------------------------------------------
+# Bulk add
+# ---------------------------------------------------------------------------
+
+@router.post("/{deck_id}/bulk-add")
+async def bulk_add_cards(deck_id: int, body: dict):
+    fn = _get("bulk_add_cards")
+    return await fn(deck_id, body)
+
+
+@router.post("/{deck_id}/bulk-add-recommended")
+async def bulk_add_recommended(deck_id: int, body: dict):
+    fn = _get("bulk_add_recommended")
+    return await fn(deck_id, body)
+
+
+# ---------------------------------------------------------------------------
+# Simulation export
+# ---------------------------------------------------------------------------
+
+@router.post("/{deck_id}/export-to-sim")
+async def export_deck_to_sim(deck_id: int):
+    fn = _get("export_deck_to_sim")
+    return await fn(deck_id)