diff --git a/conftest.py b/conftest.py
index 63b2ec9..39c9385 100644
--- a/conftest.py
+++ b/conftest.py
@@ -7,6 +7,12 @@
 
 MARKETPLACE_TF_API_KEY = getenv("MARKETPLACE_TF_API_KEY")
 BACKPACK_TF_TOKEN = getenv("BACKPACK_TF_TOKEN")
+EXPRESS_LOAD_API_KEY = getenv("EXPRESS_LOAD_API_KEY")
+
+
+@pytest.fixture
+def steam_id() -> str:
+    return "76561198253325712"
 
 
 @pytest.fixture
@@ -17,3 +23,8 @@ def marketplace_tf_api_key() -> str:
 @pytest.fixture
 def backpack_tf_token() -> str:
     return BACKPACK_TF_TOKEN
+
+
+@pytest.fixture
+def express_load_api_key() -> str:
+    return EXPRESS_LOAD_API_KEY
diff --git a/example.env b/example.env
index e8806d4..311ec19 100644
--- a/example.env
+++ b/example.env
@@ -1,2 +1,3 @@
 MARKETPLACE_TF_API_KEY=apikey
-BACKPACK_TF_TOKEN=token
\ No newline at end of file
+BACKPACK_TF_TOKEN=token
+EXPRESS_LOAD_API_KEY=apikey
\ No newline at end of file
diff --git a/src/tf2_utils/__init__.py b/src/tf2_utils/__init__.py
index d6709f2..91f92ae 100644
--- a/src/tf2_utils/__init__.py
+++ b/src/tf2_utils/__init__.py
@@ -1,7 +1,7 @@
 # flake8: noqa
 __title__ = "tf2-utils"
 __author__ = "offish"
-__version__ = "2.3.0"
+__version__ = "2.3.1"
 __license__ = "MIT"
 
 from .currency import CurrencyExchange
diff --git a/src/tf2_utils/inventory.py b/src/tf2_utils/inventory.py
index 0a44bc3..830ab68 100644
--- a/src/tf2_utils/inventory.py
+++ b/src/tf2_utils/inventory.py
@@ -2,9 +2,8 @@
 
 from .exceptions import InvalidInventory
 from .providers.custom import Custom
-from .providers.steamapis import SteamApis
+from .providers.providers import PROVIDERS
 from .providers.steamcommunity import SteamCommunity
-from .providers.steamsupply import SteamSupply
 from .sku import get_sku
 
 
@@ -39,12 +38,10 @@ def map_inventory(
 
 
 class Inventory:
-    PROVIDERS = [SteamSupply, SteamApis]
-
     def __init__(
         self, provider_name: str = "steamcommunity", api_key: str = ""
     ) -> None:
-        # set default provider for intellisense
+        # default to steamcommunity
         self.provider = SteamCommunity()
 
         # default to steam if no api_key is given
@@ -53,17 +50,13 @@ def __init__(
 
         provider_name = provider_name.lower()
 
-        if provider_name == "steamcommunity":
-            # already set
-            return
-
         # if provider_name is a url, assign it as a custom provider address
         if provider_name.startswith("http"):
             self.provider = Custom(api_key, provider_name)
             return
 
         # loop through providers create object
-        for i in self.PROVIDERS:
+        for i in PROVIDERS:
             if provider_name == i.__name__.lower():
                 # set the first found provider and then stop
                 self.provider = i(api_key)
@@ -71,9 +64,9 @@ def __init__(
 
     def fetch(self, steam_id: str, app_id: int = 440, context_id: int = 2) -> dict:
         url, params = self.provider.get_url_and_params(steam_id, app_id, context_id)
-        response = requests.get(url, params=params)
+        response = requests.get(url, params=params, headers=self.provider.headers)
 
         try:
             return response.json()
         except Exception as e:
-            return {"error": str(e)}
+            return {"success": False, "error": str(e)}
diff --git a/src/tf2_utils/providers/custom.py b/src/tf2_utils/providers/custom.py
index 960b78d..c9ee9a1 100644
--- a/src/tf2_utils/providers/custom.py
+++ b/src/tf2_utils/providers/custom.py
@@ -1,6 +1,9 @@
-class Custom:
+from .provider import Provider
+
+
+class Custom(Provider):
     def __init__(self, api_key: str, url: str) -> None:
-        self.api_key = api_key
+        super().__init__(api_key)
         self.url = url.rstrip("/")
 
     def get_url_and_params(
diff --git a/src/tf2_utils/providers/express_load.py b/src/tf2_utils/providers/express_load.py
new file mode 100644
index 0000000..39608df
--- /dev/null
+++ b/src/tf2_utils/providers/express_load.py
@@ -0,0 +1,15 @@
+from .provider import Provider
+
+
+class ExpressLoad(Provider):
+    def __init__(self, api_key: str = ""):
+        super().__init__(api_key)
+        self.headers = {"X-API-Key": self.api_key}
+
+    def get_url_and_params(
+        self, steam_id: str, app_id: int, context_id: int
+    ) -> tuple[str, dict]:
+        return (
+            f"https://api.express-load.com/inventory/{steam_id}/{app_id}/{context_id}",
+            {},
+        )
diff --git a/src/tf2_utils/providers/provider.py b/src/tf2_utils/providers/provider.py
new file mode 100644
index 0000000..23ab94b
--- /dev/null
+++ b/src/tf2_utils/providers/provider.py
@@ -0,0 +1,13 @@
+from abc import ABC, abstractmethod
+
+
+class Provider(ABC):
+    def __init__(self, api_key: str = "") -> None:
+        self.api_key = api_key
+        self.headers = {}
+
+    @abstractmethod
+    def get_url_and_params(
+        self, steam_id: str, app_id: int, context_id: int
+    ) -> tuple[str, dict]:
+        pass
diff --git a/src/tf2_utils/providers/providers.py b/src/tf2_utils/providers/providers.py
new file mode 100644
index 0000000..e08f2cd
--- /dev/null
+++ b/src/tf2_utils/providers/providers.py
@@ -0,0 +1,6 @@
+from .express_load import ExpressLoad
+from .steam_supply import SteamSupply
+from .steamapis import SteamApis
+from .steamcommunity import SteamCommunity
+
+PROVIDERS = set([ExpressLoad, SteamSupply, SteamApis, SteamCommunity])
diff --git a/src/tf2_utils/providers/steamsupply.py b/src/tf2_utils/providers/steam_supply.py
similarity index 72%
rename from src/tf2_utils/providers/steamsupply.py
rename to src/tf2_utils/providers/steam_supply.py
index 89bd617..27e64c4 100644
--- a/src/tf2_utils/providers/steamsupply.py
+++ b/src/tf2_utils/providers/steam_supply.py
@@ -1,7 +1,7 @@
-class SteamSupply:
-    def __init__(self, api_key: str) -> None:
-        self.api_key = api_key
+from .provider import Provider
 
+
+class SteamSupply(Provider):
     def get_url_and_params(
         self, steam_id: str, app_id: int, context_id: int
     ) -> tuple[str, dict]:
diff --git a/src/tf2_utils/providers/steamapis.py b/src/tf2_utils/providers/steamapis.py
index 2afd30f..1d3b6a9 100644
--- a/src/tf2_utils/providers/steamapis.py
+++ b/src/tf2_utils/providers/steamapis.py
@@ -1,12 +1,11 @@
-class SteamApis:
-    def __init__(self, api_key: str) -> None:
-        self.api_key = api_key
+from .provider import Provider
 
+
+class SteamApis(Provider):
     def get_url_and_params(
         self, steam_id: str, app_id: int, context_id: int
     ) -> tuple[str, dict]:
-        url = "https://api.steamapis.com/steam/inventory/{}/{}/{}"
         return (
-            url.format(steam_id, app_id, context_id),
+            f"https://api.steamapis.com/steam/inventory/{steam_id}/{app_id}/{context_id}",
             {"api_key": self.api_key},
         )
diff --git a/src/tf2_utils/providers/steamcommunity.py b/src/tf2_utils/providers/steamcommunity.py
index 8335f16..86b3853 100644
--- a/src/tf2_utils/providers/steamcommunity.py
+++ b/src/tf2_utils/providers/steamcommunity.py
@@ -1,7 +1,7 @@
-class SteamCommunity:
-    def __init__(self, api_key: str = "") -> None:
-        pass  # we dont care about api_key for steam
+from .provider import Provider
 
+
+class SteamCommunity(Provider):
     def get_url_and_params(
         self, steam_id: str, app_id: int, context_id: int
     ) -> tuple[str, dict]:
diff --git a/tests/test_inventory.py b/tests/test_inventory.py
index dff4347..ea1ea5a 100644
--- a/tests/test_inventory.py
+++ b/tests/test_inventory.py
@@ -1,6 +1,7 @@
 import pytest
 
 from src.tf2_utils import InvalidInventory, map_inventory
+from src.tf2_utils.inventory import Inventory
 from src.tf2_utils.utils import read_json_file
 
 INVENTORY = read_json_file("./tests/json/bot_inventory.json")
@@ -17,3 +18,56 @@ def test_inventory() -> None:
 def test_raises_error() -> None:
     with pytest.raises(InvalidInventory):
         map_inventory({}, False)
+
+
+def test_default_inventory_provider() -> None:
+    inventory = Inventory()
+    assert inventory.provider.__class__.__name__ == "SteamCommunity"
+    assert inventory.provider.api_key == ""
+
+
+def test_steamcommunity_inventory_provider() -> None:
+    inventory = Inventory("steamcommunity", "api_key")
+    assert inventory.provider.__class__.__name__ == "SteamCommunity"
+    assert inventory.provider.api_key == "api_key"
+
+
+def test_express_load_inventory_provider() -> None:
+    inventory = Inventory("expressload", "api_key")
+    assert inventory.provider.__class__.__name__ == "ExpressLoad"
+    assert inventory.provider.api_key == "api_key"
+
+
+def test_steamsupply_inventory_provider() -> None:
+    inventory = Inventory("steamsupply", "api_key")
+    assert inventory.provider.__class__.__name__ == "SteamSupply"
+    assert inventory.provider.api_key == "api_key"
+
+
+def test_custom_inventory_provider() -> None:
+    inventory = Inventory("http://example.com", "api_key")
+    assert inventory.provider.__class__.__name__ == "Custom"
+    assert inventory.provider.api_key == "api_key"
+
+
+def test_steamapis_inventory_provider() -> None:
+    inventory = Inventory("steamapis", "api_key")
+    assert inventory.provider.__class__.__name__ == "SteamApis"
+    assert inventory.provider.api_key == "api_key"
+
+
+def test_steamcommunity_inventory_fetch(steam_id: str) -> None:
+    provider = Inventory("steamcommunity")
+    inventory = provider.fetch(steam_id)
+
+    assert "assets" in inventory
+    assert "descriptions" in inventory
+
+
+def test_express_load_inventory_fetch(express_load_api_key: str, steam_id: str) -> None:
+    provider = Inventory("expressload", express_load_api_key)
+    inventory = provider.fetch(steam_id)
+
+    assert "success" in inventory
+    assert "assets" in inventory
+    assert "descriptions" in inventory
diff --git a/tests/test_providers.py b/tests/test_providers.py
new file mode 100644
index 0000000..312da80
--- /dev/null
+++ b/tests/test_providers.py
@@ -0,0 +1,24 @@
+from src.tf2_utils.providers.express_load import ExpressLoad
+from src.tf2_utils.providers.steamcommunity import SteamCommunity
+
+
+def test_steam_community_inventory(steam_id: str) -> None:
+    provider = SteamCommunity()
+    url, params = provider.get_url_and_params(steam_id, 440, 2)
+
+    assert provider.api_key == ""
+    assert url == f"https://steamcommunity.com/inventory/{steam_id}/440/2"
+    assert params == {
+        "l": "english",
+        "count": 5000,
+    }
+    assert provider.headers == {}
+
+
+def test_express_load_inventory(express_load_api_key: str, steam_id: str) -> None:
+    provider = ExpressLoad(express_load_api_key)
+    url, params = provider.get_url_and_params(steam_id, 440, 2)
+
+    assert url == f"https://api.express-load.com/inventory/{steam_id}/440/2"
+    assert params == {}
+    assert provider.headers == {"X-API-Key": express_load_api_key}