diff --git a/ebay_client/core/http/transport.py b/ebay_client/core/http/transport.py
index a9f9412..f2ef26e 100644
--- a/ebay_client/core/http/transport.py
+++ b/ebay_client/core/http/transport.py
@@ -40,13 +40,16 @@ class ApiTransport:
         request_headers = dict(self.default_headers)
         request_headers.update(headers or {})
         request_headers["Authorization"] = f"Bearer {token.access_token}"
+        filtered_params = None
+        if params is not None:
+            filtered_params = {key: value for key, value in params.items() if value is not None}
         url = f"{self.base_url}{path}"
         try:
             with httpx.Client(timeout=self.timeout_seconds) as client:
                 response = client.request(
                     method,
                     url,
-                    params=params,
+                    params=filtered_params,
                     json=json_body,
                     headers=request_headers,
                     content=content,
diff --git a/tests/test_public_wrappers.py b/tests/test_public_wrappers.py
new file mode 100644
index 0000000..430f535
--- /dev/null
+++ b/tests/test_public_wrappers.py
@@ -0,0 +1,131 @@
+from __future__ import annotations
+
+import json
+
+from pytest_httpx import HTTPXMock
+
+from ebay_client.account.client import AccountClient
+from ebay_client.core.auth.models import OAuthToken
+from ebay_client.core.http.transport import ApiTransport
+from ebay_client.feed.client import FeedClient
+from ebay_client.fulfillment.client import FulfillmentClient
+from ebay_client.generated.account.models import Programs
+from ebay_client.generated.feed.models import TaskCollection
+from ebay_client.generated.fulfillment.models import Order
+from ebay_client.generated.inventory.models import InventoryItemWithSkuLocaleGroupid
+from ebay_client.generated.notification.models import (
+    DeliveryConfig,
+    DestinationRequest,
+    TopicSearchResponse,
+)
+from ebay_client.inventory.client import InventoryClient
+from ebay_client.notification.client import NotificationClient
+
+
+class DummyOAuthClient:
+    def get_valid_token(self, *, scopes: list[str] | None = None) -> OAuthToken:
+        return OAuthToken(access_token="test-token", scope=" ".join(scopes or []))
+
+
+def build_transport() -> ApiTransport:
+    return ApiTransport(base_url="https://api.ebay.com", oauth_client=DummyOAuthClient())
+
+
+def test_notification_wrapper_returns_pydantic_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="GET",
+        url="https://api.ebay.com/commerce/notification/v1/topic?limit=10",
+        json={"topics": [{"topicId": "MARKETPLACE_ACCOUNT_DELETION", "description": "topic"}], "total": 1},
+    )
+
+    client = NotificationClient(build_transport())
+    result = client.get_topics(limit=10)
+
+    assert isinstance(result, TopicSearchResponse)
+    assert result.total == 1
+    assert result.topics and result.topics[0].topicId == "MARKETPLACE_ACCOUNT_DELETION"
+    request = httpx_mock.get_requests()[0]
+    assert request.headers["Authorization"] == "Bearer test-token"
+
+
+def test_notification_wrapper_serializes_typed_request_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="POST",
+        url="https://api.ebay.com/commerce/notification/v1/destination",
+        json={},
+        status_code=201,
+    )
+
+    client = NotificationClient(build_transport())
+    payload = DestinationRequest(
+        name="main-destination",
+        status="ENABLED",
+        deliveryConfig=DeliveryConfig(
+            endpoint="https://example.test/webhook",
+            verificationToken="verification_token_1234567890123456",
+        ),
+    )
+
+    client.create_destination(payload)
+
+    request = httpx_mock.get_requests()[0]
+    body = json.loads(request.content.decode("utf-8"))
+    assert body["name"] == "main-destination"
+    assert body["deliveryConfig"]["endpoint"] == "https://example.test/webhook"
+
+
+def test_inventory_wrapper_returns_inventory_item_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="GET",
+        url="https://api.ebay.com/sell/inventory/v1/inventory_item/SKU-1",
+        json={"sku": "SKU-1"},
+    )
+
+    client = InventoryClient(build_transport())
+    result = client.get_inventory_item("SKU-1")
+
+    assert isinstance(result, InventoryItemWithSkuLocaleGroupid)
+    assert result.sku == "SKU-1"
+
+
+def test_fulfillment_wrapper_returns_order_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="GET",
+        url="https://api.ebay.com/sell/fulfillment/v1/order/ORDER-1",
+        json={"orderId": "ORDER-1"},
+    )
+
+    client = FulfillmentClient(build_transport())
+    result = client.get_order("ORDER-1")
+
+    assert isinstance(result, Order)
+    assert result.orderId == "ORDER-1"
+
+
+def test_account_wrapper_returns_programs_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="GET",
+        url="https://api.ebay.com/sell/account/v1/program/get_opted_in_programs",
+        json={"programs": [{"programType": "OUT_OF_STOCK_CONTROL"}]},
+    )
+
+    client = AccountClient(build_transport())
+    result = client.get_opted_in_programs()
+
+    assert isinstance(result, Programs)
+    assert result.programs and result.programs[0].programType == "OUT_OF_STOCK_CONTROL"
+
+
+def test_feed_wrapper_returns_task_collection_model(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        method="GET",
+        url="https://api.ebay.com/sell/feed/v1/task?feed_type=LMS_ORDER_REPORT",
+        json={"tasks": [{"taskId": "TASK-1"}], "total": 1},
+    )
+
+    client = FeedClient(build_transport())
+    result = client.get_tasks(feed_type="LMS_ORDER_REPORT")
+
+    assert isinstance(result, TaskCollection)
+    assert result.total == 1
+    assert result.tasks and result.tasks[0].taskId == "TASK-1"
\ No newline at end of file