diff --git a/eth_portfolio/_cache.py b/eth_portfolio/_cache.py
index 46c4c53a..1dc68ef3 100644
--- a/eth_portfolio/_cache.py
+++ b/eth_portfolio/_cache.py
@@ -15,6 +15,7 @@
 BASE_PATH = f"./cache/{chain.id}/"
 EXECUTOR = a_sync.PruningThreadPoolExecutor(32)
 
+
 def cache_to_disk(fn: AnyFn[P, T]) -> AnyFn[P, T]:
     module = fn.__module__.replace(".", "/")
     cache_path_for_fn = BASE_PATH + module + "/" + fn.__name__
@@ -35,7 +36,7 @@ async def disk_cache_wrap(*args: P.args, **kwargs: P.kwargs) -> T:
                 async with aiofiles.open(cache_path, "rb", executor=EXECUTOR) as f:
                     with contextlib.suppress(EOFError):
                         return pickle.loads(await f.read())
-                        
+
             async_result: T = await fn(*args, **kwargs)
             await __cache_write(cache_path, async_result)
             return async_result
diff --git a/eth_portfolio/_ledgers/address.py b/eth_portfolio/_ledgers/address.py
index 5a5874ba..22400c33 100644
--- a/eth_portfolio/_ledgers/address.py
+++ b/eth_portfolio/_ledgers/address.py
@@ -473,10 +473,12 @@ async def trace_filter(fromBlock: int, toBlock: int, **kwargs) -> List[FilterTra
         except ClientResponseError as e:
             if e.status != HTTPStatus.SERVICE_UNAVAILABLE or toBlock == fromBlock:
                 raise
-    
-            range_size = toBlock - fromBlock + 1
+
+            from_block = int(fromBlock, 16)
+            range_size = int(toBlock, 16) - from_block + 1
             chunk_size = range_size // 2
-            halfway = fromBlock + chunk_size
+            halfway = from_block + chunk_size
+
             results = await asyncio.gather(
                 trace_filter(fromBlock=fromBlock, toBlock=halfway, **kwargs),
                 trace_filter(fromBlock=halfway + 1, toBlock=toBlock, **kwargs),
diff --git a/eth_portfolio/_loaders/token_transfer.py b/eth_portfolio/_loaders/token_transfer.py
index 85f1d642..86af07c7 100644
--- a/eth_portfolio/_loaders/token_transfer.py
+++ b/eth_portfolio/_loaders/token_transfer.py
@@ -152,7 +152,7 @@ async def get_symbol(token: ERC20) -> Optional[str]:
         return None
 
 
-@alru_cache(ttl=60*60)
+@alru_cache(ttl=60 * 60)
 @stuck_coro_debugger
 @cache_to_disk
 async def _get_transaction_index(hash: str) -> int: