diff --git a/crud.py b/crud.py
index 0ae3cfe..d66d50e 100644
--- a/crud.py
+++ b/crud.py
@@ -4,7 +4,16 @@ from typing import List, Optional
 from lnbits.db import Database
 
 from .execution_queue import enqueue
-from .models import NWCBudget, NWCKey, CreateNWCKey
+from .models import (
+    NWCBudget, 
+    NWCKey, 
+    CreateNWCKey, 
+    GetNWCKey, 
+    GetWalletNWCKey, 
+    GetBudgetsNWC, 
+    TrackedSpendNWC,
+    DeleteNWC
+)
 
 db = Database("ext_nwcprovider")
 
@@ -30,46 +39,35 @@ async def create_nwc(data: CreateNWCKey) -> NWCKey:
             await db.insert("nwcprovider.budgets", budget_entry)
     return NWCKey(**data.dict())
 
-
-async def delete_nwc(pubkey: str, wallet_id: str):
-    nwc = await get_nwc(pubkey, wallet_id)
-    if not nwc:
-        raise Exception("Public key does not exist")
+async def delete_nwc(data:DeleteNWC) -> None:
     await db.execute(
-        """
-        DELETE FROM nwcprovider.keys WHERE pubkey = ? AND wallet = ?
-        """,
-        (pubkey, wallet_id),
+        "DELETE FROM nwcprovider.keys WHERE pubkey = :pubkey AND wallet = :wallet", {"pubkey": data.pubkey, "wallet": data.wallet_id}
     )
 
-
-async def get_wallet_nwcs(
-    wallet_id: str, include_expired: Optional[bool] = False
-) -> List[NWCKey]:
-    rows = await db.fetchall(
+async def get_wallet_nwcs(data: GetWalletNWCKey) -> List[NWCKey]:
+    return await db.fetchall(
         """
-        SELECT * FROM nwcprovider.keys
-        WHERE wallet = ? AND (expires_at = 0 OR expires_at > ?)
-        """,
-        (wallet_id, int(time.time()) if not include_expired else -1),
+        SELECT * FROM nwcprovider.keys 
+        WHERE wallet = :wallet AND (expires_at = 0 OR expires_at > :expires)
+        """, 
+        {"wallet": data.wallet_id, "expires": int(time.time()) if not data.include_expired else -1},
+        model=NWCKey,
     )
-    return [NWCKey(**row) for row in rows]
-
 
 async def get_nwc(
-    pubkey: str,
-    wallet_id: Optional[str] = None,
-    include_expired: Optional[bool] = False,
-    refresh_last_used: Optional[bool] = False,
+    data: GetNWCKey
 ) -> Optional[NWCKey]:
     # expires_at = 0 means it never expires
-    if wallet_id:
+    if data.wallet_id:
         row = await db.fetchone(
             """
-            SELECT * FROM nwcprovider.keys
-            WHERE pubkey = ? AND wallet = ? AND (expires_at = 0 OR expires_at > ?)
+            SELECT * FROM nwcprovider.keys 
+            WHERE pubkey = :pubkey AND wallet = :wallet 
+            AND (expires_at = 0 OR expires_at > :expires)
             """,
-            (pubkey, wallet_id, int(time.time()) if not include_expired else -1),
+            {"pubkey": data.pubkey, "wallet": data.wallet_id, 
+             "expires": int(time.time()) if not data.include_expired else -1},
+            NWCKey,
         )
     else:
         row = await db.fetchone(
@@ -77,44 +75,52 @@ async def get_nwc(
             SELECT * FROM nwcprovider.keys
             WHERE pubkey = ? AND (expires_at = 0 OR expires_at > ?)
             """,
-            (pubkey, int(time.time()) if not include_expired else -1),
+            (data.pubkey, int(time.time()) if not data.include_expired else -1),
+        )
+        row = await db.fetchone(
+            """
+            SELECT * FROM nwcprovider.keys 
+            WHERE pubkey = :pubkey AND (expires_at = 0 OR expires_at > :expires)
+            """,
+            {"pubkey": data.pubkey, "expires": int(time.time()) if not data.include_expired else -1},
+            NWCKey,
         )
     if not row:
         return None
-    if refresh_last_used:
+    if data.refresh_last_used:
         await db.execute(
             """
-            UPDATE nwcprovider.keys SET last_used = ? WHERE pubkey = ?
+            UPDATE nwcprovider.keys SET last_used = :last_used WHERE pubkey = :pubkey
             """,
-            (int(time.time()), pubkey),
+            {"last_used":int(time.time()), "pubkey":data.pubkey},
         )
     return NWCKey(**row)
 
 
-async def get_budgets_nwc(pubkey, calculate_spent=False):
+async def get_budgets_nwc(data: GetBudgetsNWC) -> Optional[NWCBudget]:
     rows = await db.fetchall(
-        "SELECT * FROM nwcprovider.budgets WHERE pubkey = ?", (pubkey)
+        "SELECT * FROM nwcprovider.budgets WHERE pubkey = :pubkey", {"pubkey":data.pubkey}
     )
     budgets = [NWCBudget(**row) for row in rows]
-    if calculate_spent:
+    if data.calculate_spent:
         for budget in budgets:
             last_cycle, next_cycle = budget.get_timestamp_range()
             tot_spent_in_range_msats = await db.fetchone(
                 """
                 SELECT SUM(amount_msats) FROM nwcprovider.spent
-                WHERE pubkey = ? AND created_at >= ? AND created_at < ?
+                WHERE pubkey = :pubkey AND created_at >= :last_cycle AND created_at < next_cycle
                 """,
-                (pubkey, last_cycle, next_cycle),
+                {"pubkey":data.pubkey, "last_cycle":last_cycle, "next_cycle":next_cycle},
             )
             tot_spent_in_range_msats = tot_spent_in_range_msats[0] or 0
             budget.used_budget_msats = tot_spent_in_range_msats
     return budgets
 
 
-async def tracked_spend_nwc(pubkey: str, amount_msats: int, action):
+async def tracked_spend_nwc(data:TrackedSpendNWC, action):
     async def r():
         created_at = int(time.time())
-        budgets = await get_budgets_nwc(pubkey)
+        budgets = await get_budgets_nwc(data.pubkey)
         in_budget = True
         for budget in budgets:
             last_cycle, next_cycle = budget.get_timestamp_range()
@@ -123,14 +129,14 @@ async def tracked_spend_nwc(pubkey: str, amount_msats: int, action):
                     await db.fetchone(
                         """
                         SELECT SUM(amount_msats) FROM nwcprovider.spent
-                        WHERE pubkey = ? AND created_at >= ? AND created_at < ?
+                        WHERE pubkey = :pubkey AND created_at >= :last_cycle AND created_at < :next_cycle
                         """,
-                        (pubkey, last_cycle, next_cycle),
+                        {"pubkey":data.pubkey, "last_cycle":last_cycle, "next_cycle":next_cycle},
                     )
                 )[0]
                 or 0
             )
-            if tot_spent_in_range_msats + amount_msats > budget.budget_msats:
+            if tot_spent_in_range_msats + data.amount_msats > budget.budget_msats:
                 in_budget = False
                 break
         if not in_budget:
@@ -139,9 +145,9 @@ async def tracked_spend_nwc(pubkey: str, amount_msats: int, action):
         await db.execute(
             """
             INSERT INTO nwcprovider.spent (pubkey, amount_msats, created_at)
-            VALUES (?, ?, ?)
+            VALUES (:pubkey, :amount_msats, :created_at)
             """,
-            (pubkey, amount_msats, created_at),
+            {"pubkey":data.pubkey, "amount_msats":data.amount_msats, "created_at":created_at},
         )
         return True, out
 
@@ -149,29 +155,27 @@ async def tracked_spend_nwc(pubkey: str, amount_msats: int, action):
 
 
 async def get_config_nwc(key: str):
-    row = await db.fetchone("SELECT * FROM nwcprovider.config WHERE key = ?", (key,))
+    row = await db.fetchone("SELECT * FROM nwcprovider.config WHERE key = :key", {"key":key})
     if not row:
         return None
     return row["value"]
 
-
-async def get_all_config_nwc():
-    rows = await db.fetchall("SELECT * FROM nwcprovider.config")
-    return {row["key"]: row["value"] for row in rows}
-
-
 async def set_config_nwc(key: str, value: str):
     await db.execute(
         """
         DELETE FROM nwcprovider.config
-        WHERE key = ?
+        WHERE key = :key
         """,
-        (key,),
+        {"key":key},
     )
     await db.execute(
         """
         INSERT INTO nwcprovider.config (key, value)
-        VALUES (?, ?)
+        VALUES (:key, :value)
         """,
-        (key, value),
+        {"key":key, "value":value},
     )
+
+async def get_all_config_nwc():
+    rows = await db.fetchall("SELECT * FROM nwcprovider.config")
+    return {row["key"]: row["value"] for row in rows}
\ No newline at end of file
diff --git a/models.py b/models.py
index dae61af..b99a52f 100644
--- a/models.py
+++ b/models.py
@@ -26,6 +26,27 @@ class NWCKey(BaseModel):
     def from_row(cls, row: Dict[str, Any]) -> "NWCKey":
         return cls(**row)
 
+class GetNWCKey(BaseModel):
+    pubkey: str
+    wallet_id: Optional[str] = None
+    include_expired: Optional[bool] = False
+    refresh_last_used: Optional[bool] = False
+
+class GetWalletNWCKey(BaseModel):
+    wallet_id: Optional[str] = None
+    include_expired: Optional[bool] = False
+
+class GetBudgetsNWC(BaseModel):
+    pubkey: str
+    calculate_spent: Optional[bool] = False
+
+class TrackedSpendNWC(BaseModel):
+    pubkey: str
+    amount_msats: int
+
+class DeleteNWC(BaseModel):
+    pubkey: str
+    wallet_id: str
 
 class NWCBudget(BaseModel):
     id: int