diff --git a/docs/api/asm/index.rst b/docs/api/asm/index.rst
new file mode 100644
index 000000000..d6296c0a9
--- /dev/null
+++ b/docs/api/asm/index.rst
@@ -0,0 +1 @@
+.. automodule:: tenable.asm.session
diff --git a/docs/api/asm/inventory.rst b/docs/api/asm/inventory.rst
new file mode 100644
index 000000000..feee4f9f8
--- /dev/null
+++ b/docs/api/asm/inventory.rst
@@ -0,0 +1 @@
+.. automodule:: tenable.asm.inventory
diff --git a/docs/api/asm/smart_folders.rst b/docs/api/asm/smart_folders.rst
new file mode 100644
index 000000000..84fd9f76d
--- /dev/null
+++ b/docs/api/asm/smart_folders.rst
@@ -0,0 +1 @@
+.. automodule:: tenable.asm.smart_folders
diff --git a/docs/index.rst b/docs/index.rst
index 6e7888e0b..1cab9f2f2 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -9,6 +9,7 @@
    api/dl/index
    api/ie/index
    api/apa/index
+   api/asm/index
    api/nessus/index
    api/reports/index
    api/base/index
diff --git a/tenable/asm/__init__.py b/tenable/asm/__init__.py
new file mode 100644
index 000000000..48971c760
--- /dev/null
+++ b/tenable/asm/__init__.py
@@ -0,0 +1 @@
+from .session import TenableASM
diff --git a/tenable/asm/inventory.py b/tenable/asm/inventory.py
new file mode 100644
index 000000000..8fdb4bee9
--- /dev/null
+++ b/tenable/asm/inventory.py
@@ -0,0 +1,112 @@
+"""
+Inventory
+=========
+
+Methods described in this section relate to the inventory API and can be accessed at
+``TenableASM.inventory``.
+
+.. rst-class:: hide-signature
+.. autoclass:: InventoryAPI
+    :members:
+
+.. autoclass:: InventoryIterator
+    :members:
+"""
+from typing import Dict, List, Any, Optional, Tuple, TYPE_CHECKING
+from copy import copy
+from tenable.base.endpoint import APIEndpoint
+from restfly.iterator import APIIterator
+
+if TYPE_CHECKING:
+    from .session import TenableASM
+    from box import BoxList
+
+
+class InventoryIterator(APIIterator):
+    """
+    Asset inventory iterator
+    """
+    _after_asset_id: str = '0000000000'
+    _filters: List[Dict[str, str]]
+    _query: Dict[str, Any]
+    _api: 'TenableASM'
+    page: 'BoxList'
+    limit: int = 1000
+    total: int
+    stats: Dict[str, Any]
+
+    def _get_page(self):
+        query = copy(self._query)
+        if not query.get('after'):
+            query['after'] = self._after_asset_id
+
+        query['limit'] = self.limit
+        resp = self._api.post('inventory', params=query, json=self._filters)
+        self.page = resp.assets
+        self.total = resp.total
+        self.stats = resp.stats
+
+        if self.page:
+            self._after_asset_id = self.page[-1].id
+
+
+
+class InventoryAPI(APIEndpoint):
+    def list(self,
+             *search: Tuple[str, str, str],
+             columns: Optional[List[str]] = None,
+             size: int = 1000,
+             sort_field: Optional[str] = None,
+             sort_asc: bool = True,
+             inventory: bool = False,
+             ) -> InventoryIterator:
+        """
+        Lists the assets in the inventory
+
+        Args:
+            *search (tuple[str, str, str], optional):
+                A 3-part search tuple detailing what to search for from the ASM
+                dataset.  For example:
+                ``('bd.original_hostname', 'ends with', '.com')``
+            columns (list[str], optional):
+                The list of columns to return in the response.
+            size (int, optional):
+                The number of records to return with each page from the API.  Must be
+                an integer between `1` and `10000`.
+            sort_field (str, optional):
+                What field should the results be worted by?
+            sort_asc (bool):
+                How should the results be sorted?  ``True`` specifies ascending sort,
+                whereas ``False`` refers to descending.
+
+        Example:
+            >>> for item in asm.inventory.list():
+            ...     print(item)
+        """
+        if not columns:
+            columns = [
+                'bd.original_hostname',
+                'bd.severity_ranking',
+                'bd.hostname',
+                'bd.record_type',
+                'bd.ip_address',
+                'id',
+                'bd.addedtoportfolio',
+                'bd.smartfolders',
+                'bd.app_updates',
+                'ports.ports',
+                'screenshot.redirect_chain',
+                'screenshot.finalurl',
+                'ports.cves',
+            ]
+        return InventoryIterator(
+            self._api,
+            _query={
+                'columns': ','.join(columns),
+                'inventory': str(bool(inventory)).lower(),
+                'sortorder': str(bool(sort_asc)).lower(),
+                'sortby': sort_field,
+            },
+            _filters = [{'column': c, 'type': t, 'value': v} for c, t, v in search],
+            limit=size
+        )
diff --git a/tenable/asm/session.py b/tenable/asm/session.py
new file mode 100644
index 000000000..dcedd8626
--- /dev/null
+++ b/tenable/asm/session.py
@@ -0,0 +1,112 @@
+"""
+Tenable Attack Surface Management
+=================================
+
+This package covers the Tenable ASM application.
+
+.. autoclass:: TenableASM
+    :members:
+
+
+.. toctree::
+    :hidden:
+    :glob:
+
+    inventory
+    smart_folders
+
+"""
+from tenable.base.platform import APIPlatform
+from .inventory import InventoryAPI
+from .smart_folders import SmartFoldersAPI
+
+
+class TenableASM(APIPlatform):
+    """
+    The TenableASM class is the primary interaction point for users to interface with
+    Tenable Attack Surface Management via the pyTenable library.  All the API endpoint
+    classes that wrap the various aspects of ASM will be attached to this base class.
+
+    Args:
+        api_key (str, optional):
+            The user's API key to interface into Tenable ASM.  If the key isn't
+            specified, then the library will attempt to read the environment
+            variable ``TASM_API_KEY`` to get the key.
+        url (str, optional):
+            The base URL that the paths will be appended onto.  If the url isn't
+            specified, then the library will attempt to read the environment variable
+            ``TASM_URL``.
+        retries (int, optional):
+            The number of retries to make before failing a request.  The
+            default is ``5``.
+        backoff (float, optional):
+            If a 429 response is returned, how much do we want to backoff
+            if the response didn't send a Retry-After header.  The default
+            backoff is ``1`` second.
+        vendor (str, optional):
+            The vendor name for the User-Agent string.
+        product (str, optional):
+            The product name for the User-Agent string.
+        build (str, optional):
+            The version or build identifier for the User-Agent string.
+        timeout (int, optional):
+            The connection timeout parameter informing the library how long to
+            wait in seconds for a stalled response before terminating the
+            connection.  If unspecified, the default is 120 seconds.
+
+    Examples:
+
+        Basic example:
+
+        >>> from tenable.asm import TenableASM
+        >>> tasm = TenableASM(url='https://asm.cloud.tenable.com',
+        ...                   api_key='abcdef1234567890'
+        ...                   )
+
+        Another example with proper identification:
+
+        >>> tasm = TenableASM(url='https://asm.cloud.tenable.com',
+        ...                   api_key='abcdef1234567890',
+        ...                   vendor='Company Name',
+        ...                   product='My Awesome Widget',
+        ...                   build='1.0.0'
+        ...                   )
+
+        Yet another example thats leveraging the ``TASM_API_KEY`` and
+        ``TASM_URL`` environment variables:
+
+        >>> os.environ['TASM_URL'] = 'https://asm.cloud.tenable.com'
+        >>> os.environ['TASM_API_KEY'] = 'abcdef1234567890'
+        >>> tasm = TenableASM(vendor='Company Name',
+        ...                   product='My Awesome Widget',
+        ...                   build='1.0.0'
+        ...                   )
+    """
+    _base_path = 'api/1.0'
+    _env_base = 'TASM'
+    _box = True
+    _allowed_auth_mech_priority = ['key']
+    _allowed_auth_mech_params = {'key': ['api_key']}
+
+    def _key_auth(self, api_key, **kwargs):
+        """
+        API Key authorization mechanism for Tenable ASM.
+        """
+        self._session.headers.update({'Authorization': api_key})
+        self._auth_meth = 'key'
+
+    @property
+    def inventory(self):
+        """
+        The interface object for the
+        :doc:`Tenable ASM Inventory API <inventory>`
+        """
+        return InventoryAPI(self)
+
+    @property
+    def smart_folders(self):
+        """
+        The interface object for the
+        :doc:`Tenable ASM Smart Folders API <smart_folders>`
+        """
+        return SmartFoldersAPI(self)
diff --git a/tenable/asm/smart_folders.py b/tenable/asm/smart_folders.py
new file mode 100644
index 000000000..d99dea547
--- /dev/null
+++ b/tenable/asm/smart_folders.py
@@ -0,0 +1,26 @@
+"""
+Smart Folders
+=============
+
+Methods described in this section relate to the smart folders API and can be accessed at
+``TenableASM.smart_folders``.
+
+.. rst-class:: hide-signature
+.. autoclass:: SmartFoldersAPI
+    :members:
+"""
+from typing import Dict, List, Any
+from tenable.base.endpoint import APIEndpoint
+
+
+class SmartFoldersAPI(APIEndpoint):
+    _path = 'smartfolders'
+
+    def list(self) -> List[Dict[str, Any]]:
+        """
+        Returns the list of smart folders from ASM.
+
+        Example:
+            >>> folders = asm.smartfolders.list()
+        """
+        return self._get()
diff --git a/tenable/base/platform.py b/tenable/base/platform.py
index b2e792d54..69de6af5c 100644
--- a/tenable/base/platform.py
+++ b/tenable/base/platform.py
@@ -85,15 +85,15 @@ class APIPlatform(Base):
 
     def __init__(self, **kwargs):
 
-        # if the constructed URL isn't valid, then we will throw a TypeError
+        # if the constructed URL isn't valid, then we will throw a ConnectionError
         # to inform the caller that something isn't right here.
-        self._url = kwargs.get('url',
-                               os.environ.get(f'{self._env_base}_URL',
-                                              self._url
-                                              )
-                               )
-        if not url_validator(self._url):
-            raise TypeError(f'{self._url} is not a valid URL')
+        url = kwargs.get('url')
+        if not url:
+            url = os.environ.get(f'{self._env_base}_URL', self._url)
+        self._url = url
+
+        if not (self._url and url_validator(self._url, validate=['scheme', 'netloc'])):
+            raise ConnectionError(f'{self._url} is not a valid URL')
 
         # CamelCase squashing is an optional parameter thanks to Box.  if the
         # user has requested it, then we should add the appropriate parameter
diff --git a/tests/apa/__init__.py b/tests/apa/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/asm/__init__.py b/tests/asm/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/asm/test_inventory.py b/tests/asm/test_inventory.py
new file mode 100644
index 000000000..e813b3d29
--- /dev/null
+++ b/tests/asm/test_inventory.py
@@ -0,0 +1,70 @@
+import pytest
+import responses
+from responses.registries import OrderedRegistry
+from responses.matchers import json_params_matcher, query_param_matcher
+from tenable.asm import TenableASM
+
+
+@responses.activate(registry=OrderedRegistry)
+def test_asm_inventory_list():
+    test_item = {'id': 123456}
+    responses.post(
+        'https://nourl/api/1.0/inventory',
+        json={'assets': [test_item for _ in range(1000)], 'total': 2005, 'stats': {}},
+        match=[
+            query_param_matcher({
+                'columns': 'id,name',
+                'inventory': 'false',
+                'sortorder': 'true',
+                'sortby': 'id',
+                'after': '0000000000',
+                'limit': 1000,
+            }),
+            json_params_matcher([
+                {'column': 'id', 'type': 'equals', 'value': 'something'}
+            ])
+        ]
+    )
+    responses.post(
+        'https://nourl/api/1.0/inventory',
+        json={'assets': [test_item for _ in range(1000)], 'total': 2005, 'stats': {}},
+        match=[
+            query_param_matcher({
+                'columns': 'id,name',
+                'inventory': 'false',
+                'sortorder': 'true',
+                'sortby': 'id',
+                'after': '123456',
+                'limit': 1000,
+            }),
+            json_params_matcher([
+                {'column': 'id', 'type': 'equals', 'value': 'something'}
+            ])
+        ]
+    )
+    responses.post(
+        'https://nourl/api/1.0/inventory',
+        json={'assets': [test_item for _ in range(5)], 'total': 2005, 'stats': {}},
+        match=[
+            query_param_matcher({
+                'columns': 'id,name',
+                'inventory': 'false',
+                'sortorder': 'true',
+                'sortby': 'id',
+                'after': '123456',
+                'limit': 1000,
+            }),
+            json_params_matcher([
+                {'column': 'id', 'type': 'equals', 'value': 'something'}
+            ])
+        ]
+    )
+    asm = TenableASM(url='https://nourl', api_key='12345')
+    items = asm.inventory.list(
+        ('id', 'equals', 'something'),
+        columns=['id', 'name'],
+        sort_field='id'
+    )
+    for item in items:
+        assert dict(item) == test_item
+    assert items.count == 2005
diff --git a/tests/asm/test_session.py b/tests/asm/test_session.py
new file mode 100644
index 000000000..a344f0604
--- /dev/null
+++ b/tests/asm/test_session.py
@@ -0,0 +1,17 @@
+import os
+import pytest
+from tenable.asm import TenableASM
+from tenable.errors import AuthenticationWarning
+
+
+def test_asm_session_authentication():
+    asm = TenableASM(url='http://nourl', api_key='abcdef')
+    assert asm._session.headers['Authorization'] == 'abcdef'
+
+    os.environ['TASM_API_KEY'] = 'efghi'
+    asm = TenableASM(url='http://nourl')
+    assert asm._session.headers['Authorization'] == 'efghi'
+
+    os.environ.pop('TASM_API_KEY')
+    with pytest.warns(AuthenticationWarning):
+        asm = TenableASM(url='http://nourl')
diff --git a/tests/asm/test_smart_folders.py b/tests/asm/test_smart_folders.py
new file mode 100644
index 000000000..cd06f6899
--- /dev/null
+++ b/tests/asm/test_smart_folders.py
@@ -0,0 +1,49 @@
+import pytest
+import responses
+from tenable.asm import TenableASM
+
+
+@responses.activate
+def test_asm_smartfolder_list():
+    folder = {
+        'id': 1264,
+        'name': 'Recently Added Assets',
+        'hash': None,
+        'description': 'SOMETHING',
+        'filters': [
+            {'column': 'bd.addedtoportfolio', 'type': 'less than', 'value': '7'}
+        ],
+        'notifications': [
+            {
+                'type': 'email',
+                'enabled': True,
+                'email': 'user@company'
+            }
+        ],
+        'current_asset_count': 0,
+        'updated_at': '2024-09-11T00:47:20.000Z',
+        'stats': {
+            'total': 0,
+            'domaincount': 0,
+            'subdomaincount': 0
+        },
+        'extra': {
+            'columns': [
+                'bd.record_type',
+                'bd.hostname',
+                'bd.ip_address',
+                'bd.addedtoportfolio'
+            ],
+            'view': 'table'
+        },
+        'template_id': None,
+        'shared_at': None,
+        'expiration_days': 0
+    }
+    responses.get(
+        'https://nourl/api/1.0/smartfolders',
+        json=[folder for _ in range(100)]
+    )
+    asm = TenableASM(url='https://nourl', api_key='abcdef')
+    for item in asm.smart_folders.list():
+        assert dict(item) == folder
diff --git a/tests/base/__init__.py b/tests/base/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/base/test_platform.py b/tests/base/test_platform.py
index 491a775a4..676f0b187 100644
--- a/tests/base/test_platform.py
+++ b/tests/base/test_platform.py
@@ -12,7 +12,7 @@ def test_url_constructor():
     Test the URL constructor.
     '''
     # test invalid URL
-    with pytest.raises(TypeError):
+    with pytest.raises(ConnectionError):
         APIPlatform(url='something')
 
 
diff --git a/tests/dl/__init__.py b/tests/dl/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/ie/__init__.py b/tests/ie/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/ie/test_session.py b/tests/ie/test_session.py
index fb8886708..e229cb64a 100644
--- a/tests/ie/test_session.py
+++ b/tests/ie/test_session.py
@@ -11,4 +11,4 @@ def test_session_authentication_error():
     test to raise the exception unauthorized session is created
     '''
     with pytest.warns(AuthenticationWarning):
-        TenableIE()
+        TenableIE(url='http://nourl')
diff --git a/tests/ot/test_session.py b/tests/ot/test_session.py
index a9633c0ad..5773847c1 100644
--- a/tests/ot/test_session.py
+++ b/tests/ot/test_session.py
@@ -1,8 +1,10 @@
+import os
 import pytest
 from tenable.errors import AuthenticationWarning
 from tenable.ot import TenableOT
 
 
 def test_session_auth():
+    os.environ.pop('TOT_API_KEY', None)
     with pytest.warns(AuthenticationWarning):
-        t = TenableOT()
+        t = TenableOT(url='http://nourl')