diff --git a/funpaybotengine/methods/get_transactions.py b/funpaybotengine/methods/get_transactions.py
index 9a6c92d..f016ca8 100644
--- a/funpaybotengine/methods/get_transactions.py
+++ b/funpaybotengine/methods/get_transactions.py
@@ -16,6 +16,7 @@
 
 if TYPE_CHECKING:
     from funpaybotengine.client import Bot
+    from funpaybotengine.client.session.base import RawResponse
 
 
 class GetTransactions(FunPayMethod[TransactionPreviewsBatch], BaseModel):
@@ -33,7 +34,7 @@ class GetTransactions(FunPayMethod[TransactionPreviewsBatch], BaseModel):
     def __init__(
         self,
         filter: TransactionFilter | str = TransactionFilter.ALL,
-        from_transaction_id: int | None = None,
+        from_transaction_id: int = 0,
         locale: Language | None = None,
     ):
         super().__init__(
@@ -48,6 +49,18 @@ def __init__(
             from_transaction_id=from_transaction_id,
         )
 
+        if self.filter is TransactionFilter.UNKNOWN:
+            raise ValueError(f'Unknown filter.')
+
+    async def transform_result(
+        self,
+        parsing_result: Any,
+        response: RawResponse[Any],
+    ) -> TransactionPreviewsBatch:
+        batch = await super().transform_result(parsing_result, response)
+        batch.filter = self.filter
+        return batch
+
 
 async def make_data(method: GetTransactions, bot: Bot) -> dict[str, Any]:
     return {
diff --git a/funpaybotengine/methods/get_transactions_page.py b/funpaybotengine/methods/get_transactions_page.py
index 4e680ec..72d7b1e 100644
--- a/funpaybotengine/methods/get_transactions_page.py
+++ b/funpaybotengine/methods/get_transactions_page.py
@@ -4,15 +4,21 @@
 __all__ = ('GetTransactionsPage',)
 
 
+from typing import TYPE_CHECKING, Any
+
 from pydantic import BaseModel
 from funpayparsers.parsers.page_parsers import TransactionsPageParser
 
-from funpaybotengine.types.enums import Language
+from funpaybotengine.types.enums import Language, TransactionFilter
 from funpaybotengine.types.pages import TransactionsPage
 from funpaybotengine.methods.base import FunPayMethod
 from funpaybotengine.client.session import HTTPMethod
 
 
+if TYPE_CHECKING:
+    from funpaybotengine.client.session.base import RawResponse
+
+
 class GetTransactionsPage(FunPayMethod[TransactionsPage], BaseModel):
     """Get the transactions page (``https://funpay.com/account/balance``)."""
 
@@ -27,3 +33,13 @@ def __init__(self, locale: Language | None = None):
             allow_anonymous=False,
             allow_uninitialized=True,
         )
+
+    async def transform_result(
+        self,
+        parsing_result: Any,
+        response: RawResponse[Any],
+    ) -> TransactionsPage:
+        page = await super().transform_result(parsing_result, response)
+        if page.transactions is not None:
+            page.transactions.filter = TransactionFilter.ALL
+        return page
diff --git a/funpaybotengine/types/enums.py b/funpaybotengine/types/enums.py
index 502ea59..daa62a7 100644
--- a/funpaybotengine/types/enums.py
+++ b/funpaybotengine/types/enums.py
@@ -31,6 +31,8 @@ class TransactionFilter(str, Enum):
     OTHER = 'other'
     """Other transactions."""
 
+    UNKNOWN = 'unknown'
+
 
 class OrderPreviewType(Enum):
     SALE = auto()
diff --git a/funpaybotengine/types/finances.py b/funpaybotengine/types/finances.py
index 16d6827..85de3ef 100644
--- a/funpaybotengine/types/finances.py
+++ b/funpaybotengine/types/finances.py
@@ -6,6 +6,7 @@
 
 from types import MappingProxyType
 from collections.abc import Mapping
+from typing import Any
 
 from pydantic import BaseModel, field_validator
 from funpayparsers.parsers.utils import parse_date_string
@@ -83,21 +84,18 @@ class TransactionPreviewsBatch(FunPayObject, BaseModel):
     user_id: int | None
     """ID of the user to whom all transactions in this batch belong."""
 
-    filter: TransactionFilter | None
-    """Transactions filter applied to the current batch."""
+    filter: TransactionFilter
+    """
+    Transactions filter applied to the current batch.
 
-    @field_validator('filter', mode='before')
-    @classmethod
-    def _coerce_transaction_filter(
-        cls,
-        value: str | TransactionFilter | None,
-    ) -> TransactionFilter | None:
-        if value is None or isinstance(value, TransactionFilter):
-            return value
-        try:
-            return TransactionFilter(value)
-        except ValueError:
-            return None
+    The building method stamps this with the filter that was actually requested
+    (see ``GetTransactions.transform_result``). The value scraped from the response
+    HTML is only a fallback for hand-built objects, since FunPay omits the hidden
+    ``filter`` input in some responses.
+
+    ``None`` means the filter is unknown, which is not the same as
+    ``TransactionFilter.ALL``.
+    """
 
     next_transaction_id: int | None
     """
@@ -109,11 +107,19 @@ def _coerce_transaction_filter(
     If ``None``, there are no more transactions to load.
     """
 
+    @field_validator('filter', mode='before')
+    @classmethod
+    def _coerce_transaction_filter(cls, value: Any) -> TransactionFilter | None:
+        try:
+            return TransactionFilter(value)
+        except ValueError:
+            return TransactionFilter.UNKNOWN
+
     async def next_batch(self) -> TransactionPreviewsBatch:
         if not self.next_transaction_id:
             raise ValueError('Last batch.')
 
         return await self.get_bound_bot().get_transactions(
             from_transaction_id=self.next_transaction_id,
-            filter=self.filter or '',
+            filter=self.filter,
         )