diff --git a/mev_inspect/block.py b/mev_inspect/block.py
index 8b18078..74c4f1e 100644
--- a/mev_inspect/block.py
+++ b/mev_inspect/block.py
@@ -1,7 +1,7 @@
 import asyncio
 import logging
 import time
-from typing import List, Optional
+from typing import List, Optional, Tuple, Dict
 
 from sqlalchemy import orm
 from web3 import Web3
@@ -99,10 +99,10 @@ async def get_classified_traces_from_events(w3: Web3, after_block: int, before_b
     base_provider = w3.provider
     start = after_block
     stride = 300
-    reserves = dict()
+    reserves: Dict[str, Tuple[str, str]] = dict()
     while start < before_block:
         begin = start
-        end = start + stride if (start + stride) < before_block else before_block
+        end = start + stride if (start + stride) < before_block else before_block-1
         start += stride
         print("fetching from node...", begin, end, flush=True)
         swaplogs = await _get_logs_for_topics(base_provider, begin, end, ["0xd78ad95fa46c994b6551d0da85fc275fe613ce37657fb8d5e3d130840159d822"])
diff --git a/mev_inspect/crud/arbitrages.py b/mev_inspect/crud/arbitrages.py
index e0eb180..e846585 100644
--- a/mev_inspect/crud/arbitrages.py
+++ b/mev_inspect/crud/arbitrages.py
@@ -41,7 +41,7 @@ def write_arbitrages(
                 end_amount=arbitrage.end_amount,
                 profit_amount=arbitrage.profit_amount,
                 error=arbitrage.error,
-                protocols={swap.protocol.value for swap in arbitrage.swaps},
+                protocols={swap.protocol.value for swap in arbitrage.swaps if swap.protocol is not None},
             )
         )
 
diff --git a/mev_inspect/inspect_block.py b/mev_inspect/inspect_block.py
index 9680758..59aea5c 100644
--- a/mev_inspect/inspect_block.py
+++ b/mev_inspect/inspect_block.py
@@ -1,5 +1,5 @@
 import logging
-from typing import List, Optional
+from typing import List, Optional, Any, Dict
 
 from sqlalchemy import orm
 from web3 import Web3
@@ -90,11 +90,13 @@ async def inspect_many_blocks(
     arbitrages_payload = []
     async for swaps in get_classified_traces_from_events(w3, after_block_number, before_block_number):
         arbitrages = get_arbitrages(swaps)
+
+
         count += len(arbitrages)
         logger.info(f"{count} Found {len(swaps)} swaps and {len(arbitrages)} arbitrages")
         if len(arbitrages) > 0:
             for arb in arbitrages:
-                arb_payload = dict()
+                arb_payload: Dict[str, Any] = dict()
                 arb_payload['block_number'] = arb.block_number
                 arb_payload['transaction'] = arb.transaction_hash
                 arb_payload['account'] = arb.account_address