diff --git a/pytonapi/async_tonapi/methods/accounts.py b/pytonapi/async_tonapi/methods/accounts.py
index 5196c5a..b05ed4f 100644
--- a/pytonapi/async_tonapi/methods/accounts.py
+++ b/pytonapi/async_tonapi/methods/accounts.py
@@ -118,7 +118,7 @@ async def get_jettons_history(
         """
         method = f"v2/accounts/{account_id}/jettons/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -158,7 +158,7 @@ async def get_jettons_history_by_jetton(
         """
         method = f"v2/accounts/{account_id}/jettons/{jetton_id}/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -264,7 +264,7 @@ async def get_events(
         """
         method = f"v2/accounts/{account_id}/events"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -338,7 +338,7 @@ async def get_nft_history(
         """
         method = f"v2/accounts/{account_id}/nfts/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
diff --git a/pytonapi/async_tonapi/methods/inscriptions.py b/pytonapi/async_tonapi/methods/inscriptions.py
index 75ab4e0..66097e9 100644
--- a/pytonapi/async_tonapi/methods/inscriptions.py
+++ b/pytonapi/async_tonapi/methods/inscriptions.py
@@ -44,7 +44,7 @@ async def get_inscription_history(
         """
         method = f"v2/experimental/accounts/{account_id}/inscriptions/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         headers = {"Accept-Language": accept_language}
         response = await self._get(method=method, params=params, headers=headers)
@@ -70,7 +70,7 @@ async def get_inscription_history_by_ticker(
         """
         method = f"v2/experimental/accounts/{account_id}/inscriptions/{ticker}/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         headers = {"Accept-Language": accept_language}
         response = await self._get(method=method, params=params, headers=headers)
diff --git a/pytonapi/async_tonapi/methods/nft.py b/pytonapi/async_tonapi/methods/nft.py
index f8e3c8c..9bd36c6 100644
--- a/pytonapi/async_tonapi/methods/nft.py
+++ b/pytonapi/async_tonapi/methods/nft.py
@@ -124,7 +124,7 @@ async def get_nft_history(
         """
         method = f"v2/nfts/{account_id}/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
diff --git a/pytonapi/tonapi/methods/accounts.py b/pytonapi/tonapi/methods/accounts.py
index 8bde7b5..ebb2828 100644
--- a/pytonapi/tonapi/methods/accounts.py
+++ b/pytonapi/tonapi/methods/accounts.py
@@ -118,7 +118,7 @@ def get_jettons_history(
         """
         method = f"v2/accounts/{account_id}/jettons/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -158,7 +158,7 @@ def get_jettons_history_by_jetton(
         """
         method = f"v2/accounts/{account_id}/jettons/{jetton_id}/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -264,7 +264,7 @@ def get_events(
         """
         method = f"v2/accounts/{account_id}/events"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
@@ -338,7 +338,7 @@ def get_nft_history(
         """
         method = f"v2/accounts/{account_id}/nfts/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         if subject_only:
             params["subject_only"] = "true"
diff --git a/pytonapi/tonapi/methods/blockchain.py b/pytonapi/tonapi/methods/blockchain.py
index 845c97f..65ad156 100644
--- a/pytonapi/tonapi/methods/blockchain.py
+++ b/pytonapi/tonapi/methods/blockchain.py
@@ -197,8 +197,8 @@ def get_account_transactions(
         """
         method = f"v2/blockchain/accounts/{account_id}/transactions"
         params = {"limit": limit}
-        if before_lt: params["before_lt"] = before_lt  # noqa E701
-        if after_lt: params["after_lt"] = after_lt  # noqa E701
+        if before_lt is not None: params["before_lt"] = before_lt  # noqa E701
+        if after_lt is not None: params["after_lt"] = after_lt  # noqa E701
         response = self._get(method=method, params=params)
 
         return Transactions(**response)
diff --git a/pytonapi/tonapi/methods/inscriptions.py b/pytonapi/tonapi/methods/inscriptions.py
index eb4a2eb..9405f00 100644
--- a/pytonapi/tonapi/methods/inscriptions.py
+++ b/pytonapi/tonapi/methods/inscriptions.py
@@ -44,7 +44,7 @@ def get_inscription_history(
         """
         method = f"v2/experimental/accounts/{account_id}/inscriptions/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         headers = {"Accept-Language": accept_language}
         response = self._get(method=method, params=params, headers=headers)
@@ -70,7 +70,7 @@ def get_inscription_history_by_ticker(
         """
         method = f"v2/experimental/accounts/{account_id}/inscriptions/{ticker}/history"
         params = {"limit": limit}
-        if before_lt:
+        if before_lt is not None:
             params["before_lt"] = before_lt
         headers = {"Accept-Language": accept_language}
         response = self._get(method=method, params=params, headers=headers)
diff --git a/pytonapi/tonapi/methods/nft.py b/pytonapi/tonapi/methods/nft.py
index 0f11ba9..2da3ed6 100644
--- a/pytonapi/tonapi/methods/nft.py
+++ b/pytonapi/tonapi/methods/nft.py
@@ -120,7 +120,7 @@ def get_nft_history(
         """
         method = f"v2/nfts/{account_id}/history"
         params = {"limit": limit}
-        if before_lt: params["before_lt"] = before_lt  # noqa:E701
+        if before_lt is not None: params["before_lt"] = before_lt  # noqa:E701
         if subject_only: params["subject_only"] = "true"  # noqa:E701
         if start_date: params["start_date"] = start_date  # noqa:E701
         if end_date: params["end_date"] = end_date  # noqa:E701