diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e603ad..8439d4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ This is the changelog for [Authress SDK](readme.md).
 
 ## 3.1 ##
 * [Breaking] Throw validation error on setting a property that doesn't exist in any of the Authress DTO Models.
+* Optimize JWKs fetching using the keyId
 
 ## 3.0 ##
 * [Breaking] Added type checking everywhere - This means most models have breaking changes.
diff --git a/authress/__init__.py b/authress/__init__.py
index 66b4fcb..53649c6 100644
--- a/authress/__init__.py
+++ b/authress/__init__.py
@@ -9,6 +9,7 @@
 from authress.authress_client import AuthressClient
 from authress.http_client import HttpClient
 from authress.rest import ApiException
+from authress.utils.service_client_token_provider import ServiceClientTokenProvider
  
 # import apis into sdk package
 from authress.api.access_records_api import AccessRecordsApi
diff --git a/authress/api/access_records_api.py b/authress/api/access_records_api.py
index 1a5df0e..3a23bf5 100644
--- a/authress/api/access_records_api.py
+++ b/authress/api/access_records_api.py
@@ -37,7 +37,6 @@
 from authress.models.access_request_response import AccessRequestResponse
 from authress.models.claim_request import ClaimRequest
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -53,8 +52,6 @@ class AccessRecordsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/accounts_api.py b/authress/api/accounts_api.py
index d74d467..3f00420 100644
--- a/authress/api/accounts_api.py
+++ b/authress/api/accounts_api.py
@@ -37,7 +37,6 @@
 from authress.models.identity_collection import IdentityCollection
 from authress.models.identity_request import IdentityRequest
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -53,8 +52,6 @@ class AccountsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/applications_api.py b/authress/api/applications_api.py
index f737b2d..27a3c90 100644
--- a/authress/api/applications_api.py
+++ b/authress/api/applications_api.py
@@ -30,7 +30,6 @@
 
 from authress.models.application_delegation import ApplicationDelegation
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -46,8 +45,6 @@ class ApplicationsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/connections_api.py b/authress/api/connections_api.py
index 9530553..ee4395d 100644
--- a/authress/api/connections_api.py
+++ b/authress/api/connections_api.py
@@ -32,7 +32,6 @@
 from authress.models.connection_collection import ConnectionCollection
 from authress.models.user_connection_credentials import UserConnectionCredentials
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -48,8 +47,6 @@ class ConnectionsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/extensions_api.py b/authress/api/extensions_api.py
index ea73cf7..98d2271 100644
--- a/authress/api/extensions_api.py
+++ b/authress/api/extensions_api.py
@@ -36,7 +36,6 @@
 from authress.models.o_auth_token_request import OAuthTokenRequest
 from authress.models.o_auth_token_response import OAuthTokenResponse
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -52,8 +51,6 @@ class ExtensionsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/groups_api.py b/authress/api/groups_api.py
index 4fe9b78..ea4487a 100644
--- a/authress/api/groups_api.py
+++ b/authress/api/groups_api.py
@@ -33,7 +33,6 @@
 from authress.models.group import Group
 from authress.models.group_collection import GroupCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -49,8 +48,6 @@ class GroupsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/invites_api.py b/authress/api/invites_api.py
index 0fce3fa..b0bf77d 100644
--- a/authress/api/invites_api.py
+++ b/authress/api/invites_api.py
@@ -31,7 +31,6 @@
 from authress.models.account import Account
 from authress.models.invite import Invite
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -47,8 +46,6 @@ class InvitesApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/resource_permissions_api.py b/authress/api/resource_permissions_api.py
index 5a5b5de..847bb97 100644
--- a/authress/api/resource_permissions_api.py
+++ b/authress/api/resource_permissions_api.py
@@ -34,7 +34,6 @@
 from authress.models.permissioned_resource_collection import PermissionedResourceCollection
 from authress.models.resource_users_collection import ResourceUsersCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -50,8 +49,6 @@ class ResourcePermissionsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/roles_api.py b/authress/api/roles_api.py
index 33defee..31a98bc 100644
--- a/authress/api/roles_api.py
+++ b/authress/api/roles_api.py
@@ -28,7 +28,6 @@
 from authress.models.role import Role
 from authress.models.role_collection import RoleCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -44,8 +43,6 @@ class RolesApi(object):
     """
 
     def __init__(self, api_client=None) -> None:
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/service_clients_api.py b/authress/api/service_clients_api.py
index 616a24a..4798c9f 100644
--- a/authress/api/service_clients_api.py
+++ b/authress/api/service_clients_api.py
@@ -34,7 +34,6 @@
 from authress.models.client_access_key import ClientAccessKey
 from authress.models.client_collection import ClientCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -50,8 +49,6 @@ class ServiceClientsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/tenants_api.py b/authress/api/tenants_api.py
index 3ebeb9a..3bcdc92 100644
--- a/authress/api/tenants_api.py
+++ b/authress/api/tenants_api.py
@@ -27,7 +27,6 @@
 from authress.models.tenant_collection import TenantCollection
 from authress.models.tenant_user import TenantUser
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -43,8 +42,6 @@ class TenantsApi:
     """
 
     def __init__(self, api_client=None) -> None:
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/token_verifier.py b/authress/api/token_verifier.py
index 7a7e82b..b60f145 100644
--- a/authress/api/token_verifier.py
+++ b/authress/api/token_verifier.py
@@ -11,7 +11,11 @@
 from authress.utils import service_client_token_provider, PackageVersionProvider
 
 class TokenVerifier(object):
-  def __init__(self):
+  def __init__(self, http_client=None):
+    self.http_client = http_client
+    if http_client is None:
+      self.http_client = rest.RESTClientObject()
+
     self.keyMap = dict()
     self.package_version_provider = PackageVersionProvider()
 
@@ -72,14 +76,12 @@ def get_public_key(self, jwkKeyListUrl, kid):
       self.keyMap[hashKey] = self.get_key_uncached(jwkKeyListUrl, kid)
       return self.keyMap[hashKey]
 
-  def get_key_uncached(self, jwkKeyListUrl, kid):
-    rest_client = rest.RESTClientObject()
-    
+  def get_key_uncached(self, jwkKeyListUrl, kid):    
     version = self.package_version_provider.get_version()
     headers = {
       'User-Agent': f'Authress SDK; Python; {version};'
     }
-    result = rest_client.get_request(jwkKeyListUrl, headers=headers)
+    result = self.http_client.request_with_retries('GET', jwkKeyListUrl, headers=headers)
 
     for index, key in enumerate(json.loads(result.data)['keys']):
       if key['kid'] == kid:
diff --git a/authress/api/user_permissions_api.py b/authress/api/user_permissions_api.py
index 9e79fda..a811caf 100644
--- a/authress/api/user_permissions_api.py
+++ b/authress/api/user_permissions_api.py
@@ -34,7 +34,6 @@
 from authress.models.user_resources_collection import UserResourcesCollection
 from authress.models.user_role_collection import UserRoleCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -50,8 +49,6 @@ class UserPermissionsApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/api/users_api.py b/authress/api/users_api.py
index de1fc9a..5ca254c 100644
--- a/authress/api/users_api.py
+++ b/authress/api/users_api.py
@@ -34,7 +34,6 @@
 from authress.models.user_identity import UserIdentity
 from authress.models.user_identity_collection import UserIdentityCollection
 
-from authress.http_client import HttpClient
 from authress.api_response import ApiResponse
 from authress.exceptions import (  # noqa: F401
     ApiTypeError,
@@ -50,8 +49,6 @@ class UsersApi(object):
     """
 
     def __init__(self, api_client=None):
-        if api_client is None:
-            api_client = HttpClient.get_default()
         self.api_client = api_client
 
     @validate_arguments
diff --git a/authress/authress_client.py b/authress/authress_client.py
index 50e01c8..ed2f83c 100644
--- a/authress/authress_client.py
+++ b/authress/authress_client.py
@@ -23,11 +23,12 @@
 from authress.api import token_verifier
 
 class AuthressClient(object):
-    def __init__(self, authress_api_url=None, service_client_access_key=None):
+    def __init__(self, authress_api_url=None, service_client_access_key=None, user_agent=None):
         self._host = authress_api_url if authress_api_url.startswith('http') else f"https://{authress_api_url}"
         self._host = re.sub(r'/+$', '', self._host)
-        self._token_verifier = token_verifier.TokenVerifier()
-        self._http_client = HttpClient(host=self._host, access_key=service_client_access_key)
+        
+        self._http_client = HttpClient(host=self._host, access_key=service_client_access_key, user_agent=user_agent)
+        self._token_verifier = token_verifier.TokenVerifier(http_client=self._http_client)
 
     def set_token(self, token: str):
         self._http_client.set_token(token)
diff --git a/authress/http_client.py b/authress/http_client.py
index ab7924b..2d74365 100644
--- a/authress/http_client.py
+++ b/authress/http_client.py
@@ -48,7 +48,7 @@ class HttpClient(object):
     }
     _pool = None
 
-    def __init__(self, host=None, access_key=None):
+    def __init__(self, host=None, access_key=None, user_agent=None):
         self.host = host if host is not None and host.startswith('http') else f"https://{host}"
         self.access_key = access_key
         self.pool_threads = 1
@@ -60,7 +60,7 @@ def __init__(self, host=None, access_key=None):
         self.service_client_token_provider = service_client_token_provider.ServiceClientTokenProvider(self.access_key, self.host)
         
         version = PackageVersionProvider().get_version()
-        self.default_headers['User-Agent'] = f'Authress SDK; Python; {version};'
+        self.default_headers['User-Agent'] = f'Authress SDK; Python; {version}; {user_agent or ""}'
 
     def set_token(self, token):
         self.default_headers['Authorization'] = f'Bearer {token.replace("Bearer", "").strip()}'
diff --git a/test/test_service_client_token_provider.py b/test/test_service_client_token_provider.py
index cbae872..d726842 100644
--- a/test/test_service_client_token_provider.py
+++ b/test/test_service_client_token_provider.py
@@ -6,7 +6,6 @@
 from authress.models import *
 from authress.utils import ServiceClientTokenProvider, JwtManager
 from authress import AuthressClient
-from authress.http_client import HttpClient
 
 import unittest
 from unittest.mock import patch
@@ -27,10 +26,10 @@ def test_get_token(self):
 
     access_key = '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'
 
-    http_client = HttpClient("", access_key)
-    token1 = http_client._get_client_token()
+    service_client_token_provider = ServiceClientTokenProvider(access_key, "")
+    token1 = service_client_token_provider.get_client_token()
     time.sleep(2)
-    token2 = http_client._get_client_token()
+    token2 = service_client_token_provider.get_client_token()
     assert token1 == token2
     pass
 
@@ -42,10 +41,10 @@ def test_get_token_for_eddsa(self):
 
     access_key = 'CLIENT.KEY.ACCOUNT.MC4CAQAwBQYDK2VwBCIEIIM7npIckfT431rYzEeF+hCqvHogpOllmVSgINwqQv+g'
 
-    http_client = HttpClient("", access_key)
-    token1 = http_client._get_client_token()
+    service_client_token_provider = ServiceClientTokenProvider(access_key, "")
+    token1 = service_client_token_provider.get_client_token()
     time.sleep(2)
-    token2 = http_client._get_client_token()
+    token2 = service_client_token_provider.get_client_token()
     assert token1 == token2
     pass
 
@@ -55,8 +54,8 @@ def test_get_token_without_access_key(self):
     Ignores access keys that are None
     """
 
-    http_client = HttpClient("")
-    token1 = http_client._get_client_token()
+    service_client_token_provider = ServiceClientTokenProvider("")
+    token1 = service_client_token_provider.get_client_token()
     assert token1 == None
     pass
 
diff --git a/test/test_token_verifier.py b/test/test_token_verifier.py
index 3d9e38a..cdc078d 100644
--- a/test/test_token_verifier.py
+++ b/test/test_token_verifier.py
@@ -29,7 +29,7 @@ def test_get_token_for_eddsa(self):
     token_verifier_instance.get_key_uncached = mock_get_key_uncached
     identity = token_verifier_instance.verify_token(authressCustomDomain=f"https://{customDomain}", token=access_key)
 
-    mock_get_key_uncached.assert_called_once_with(f"https://{customDomain}/v1/clients/CLIENT/.well-known/openid-configuration/jwks", "KEY")
+    mock_get_key_uncached.assert_called_once_with(f"https://{customDomain}/v1/clients/CLIENT/.well-known/openid-configuration/jwks?kid=KEY", "KEY")
     assert identity['iss'] == f'https://{customDomain}/v1/clients/CLIENT'
     assert identity['sub'] == "CLIENT"