diff --git a/tests/core/providers/test_auto_provider.py b/tests/core/providers/test_auto_provider.py
index f322b68694..09c3f41e2a 100644
--- a/tests/core/providers/test_auto_provider.py
+++ b/tests/core/providers/test_auto_provider.py
@@ -26,9 +26,11 @@
 
 
 @pytest.fixture(autouse=True)
-def delete_infura_key(monkeypatch):
-    monkeypatch.delenv('INFURA_API_KEY', raising=False)
+def delete_environment_variables(monkeypatch):
+    monkeypatch.delenv('WEB3_INFURA_PROJECT_ID', raising=False)
     monkeypatch.delenv('WEB3_INFURA_API_KEY', raising=False)
+    monkeypatch.delenv('WEB3_INFURA_API_SECRET', raising=False)
+    monkeypatch.delenv('WEB3_INFURA_SCHEME', raising=False)
 
 
 @pytest.mark.parametrize(
@@ -105,7 +107,7 @@ def test_web3_auto_infura_websocket_default(monkeypatch, caplog, environ_name):
     monkeypatch.setenv('WEB3_INFURA_SCHEME', 'wss')
     API_KEY = 'aoeuhtns'
     monkeypatch.setenv(environ_name, API_KEY)
-    expected_url = 'wss://%s/ws/v3/%s' % (infura.INFURA_MAINNET_DOMAIN, API_KEY)
+    expected_url = 'wss://:@%s/ws/v3/%s' % (infura.INFURA_MAINNET_DOMAIN, API_KEY)
 
     importlib.reload(infura)
     assert len(caplog.record_tuples) == 0
@@ -122,3 +124,32 @@ def test_web3_auto_infura_raises_error_with_nonexistent_scheme(monkeypatch):
     error_msg = "Cannot connect to Infura with scheme 'not-a-scheme'"
     with pytest.raises(ValidationError, match=error_msg):
         importlib.reload(infura)
+
+
+@pytest.mark.parametrize('environ_name', ['WEB3_INFURA_API_KEY', 'WEB3_INFURA_PROJECT_ID'])
+def test_web3_auto_infura_websocket_with_secret(monkeypatch, caplog, environ_name):
+    monkeypatch.setenv(environ_name, 'test')
+    monkeypatch.setenv('WEB3_INFURA_API_SECRET', 'secret')
+
+    importlib.reload(infura)
+
+    w3 = infura.w3
+    assert isinstance(w3.provider, WebsocketProvider)
+    expected_url = 'wss://:secret@%s/ws/v3/test' % (infura.INFURA_MAINNET_DOMAIN)
+    assert getattr(w3.provider, 'endpoint_uri') == expected_url
+
+
+@pytest.mark.parametrize('environ_name', ['WEB3_INFURA_API_KEY', 'WEB3_INFURA_PROJECT_ID'])
+def test_web3_auto_infura_with_secret(monkeypatch, caplog, environ_name):
+    monkeypatch.setenv('WEB3_INFURA_SCHEME', 'https')
+    monkeypatch.setenv(environ_name, 'test')
+    monkeypatch.setenv('WEB3_INFURA_API_SECRET', 'secret')
+
+    importlib.reload(infura)
+
+    w3 = infura.w3
+    assert isinstance(w3.provider, HTTPProvider)
+    expected_url = 'https://%s/v3/test' % (infura.INFURA_MAINNET_DOMAIN)
+    expected_auth_value = ('', 'secret')
+    assert getattr(w3.provider, 'endpoint_uri') == expected_url
+    assert w3.provider.get_request_kwargs()['auth'] == expected_auth_value
diff --git a/web3/auto/infura/__init__.py b/web3/auto/infura/__init__.py
index aa29978adb..b04e8ba37d 100644
--- a/web3/auto/infura/__init__.py
+++ b/web3/auto/infura/__init__.py
@@ -5,9 +5,11 @@
 
 from .endpoints import (
     INFURA_MAINNET_DOMAIN,
+    build_http_headers,
     build_infura_url,
 )
 
+_headers = build_http_headers()
 _infura_url = build_infura_url(INFURA_MAINNET_DOMAIN)
 
-w3 = Web3(load_provider_from_uri(_infura_url))
+w3 = Web3(load_provider_from_uri(_infura_url, _headers))
diff --git a/web3/auto/infura/endpoints.py b/web3/auto/infura/endpoints.py
index b7ac9d03c8..62226a04fa 100644
--- a/web3/auto/infura/endpoints.py
+++ b/web3/auto/infura/endpoints.py
@@ -29,12 +29,24 @@ def load_api_key():
     return key
 
 
+def load_secret():
+    return os.environ.get('WEB3_INFURA_API_SECRET', '')
+
+
+def build_http_headers():
+    secret = load_secret()
+    if secret:
+        headers = {'auth': ('', secret)}
+        return headers
+
+
 def build_infura_url(domain):
     scheme = os.environ.get('WEB3_INFURA_SCHEME', WEBSOCKET_SCHEME)
     key = load_api_key()
+    secret = load_secret()
 
     if scheme == WEBSOCKET_SCHEME:
-        return "%s://%s/ws/v3/%s" % (scheme, domain, key)
+        return "%s://:%s@%s/ws/v3/%s" % (scheme, secret, domain, key)
     elif scheme == HTTP_SCHEME:
         return "%s://%s/v3/%s" % (scheme, domain, key)
     else:
diff --git a/web3/auto/infura/kovan.py b/web3/auto/infura/kovan.py
index 3a15bff6f0..e9b12005f4 100644
--- a/web3/auto/infura/kovan.py
+++ b/web3/auto/infura/kovan.py
@@ -5,9 +5,11 @@
 
 from .endpoints import (
     INFURA_KOVAN_DOMAIN,
+    build_http_headers,
     build_infura_url,
 )
 
+_headers = build_http_headers()
 _infura_url = build_infura_url(INFURA_KOVAN_DOMAIN)
 
-w3 = Web3(load_provider_from_uri(_infura_url))
+w3 = Web3(load_provider_from_uri(_infura_url, _headers))
diff --git a/web3/auto/infura/mainnet.py b/web3/auto/infura/mainnet.py
index aa29978adb..b04e8ba37d 100644
--- a/web3/auto/infura/mainnet.py
+++ b/web3/auto/infura/mainnet.py
@@ -5,9 +5,11 @@
 
 from .endpoints import (
     INFURA_MAINNET_DOMAIN,
+    build_http_headers,
     build_infura_url,
 )
 
+_headers = build_http_headers()
 _infura_url = build_infura_url(INFURA_MAINNET_DOMAIN)
 
-w3 = Web3(load_provider_from_uri(_infura_url))
+w3 = Web3(load_provider_from_uri(_infura_url, _headers))
diff --git a/web3/auto/infura/rinkeby.py b/web3/auto/infura/rinkeby.py
index 35b870b638..972df83dfb 100644
--- a/web3/auto/infura/rinkeby.py
+++ b/web3/auto/infura/rinkeby.py
@@ -8,10 +8,12 @@
 
 from .endpoints import (
     INFURA_RINKEBY_DOMAIN,
+    build_http_headers,
     build_infura_url,
 )
 
+_headers = build_http_headers()
 _infura_url = build_infura_url(INFURA_RINKEBY_DOMAIN)
 
-w3 = Web3(load_provider_from_uri(_infura_url))
+w3 = Web3(load_provider_from_uri(_infura_url, _headers))
 w3.middleware_onion.inject(geth_poa_middleware, layer=0)
diff --git a/web3/auto/infura/ropsten.py b/web3/auto/infura/ropsten.py
index cde15e757b..d82356bcaa 100644
--- a/web3/auto/infura/ropsten.py
+++ b/web3/auto/infura/ropsten.py
@@ -5,9 +5,11 @@
 
 from .endpoints import (
     INFURA_ROPSTEN_DOMAIN,
+    build_http_headers,
     build_infura_url,
 )
 
+_headers = build_http_headers()
 _infura_url = build_infura_url(INFURA_ROPSTEN_DOMAIN)
 
-w3 = Web3(load_provider_from_uri(_infura_url))
+w3 = Web3(load_provider_from_uri(_infura_url, _headers))
diff --git a/web3/providers/auto.py b/web3/providers/auto.py
index 3c5b33b264..26c9ca3ab6 100644
--- a/web3/providers/auto.py
+++ b/web3/providers/auto.py
@@ -25,12 +25,12 @@ def load_provider_from_environment():
     return load_provider_from_uri(uri_string)
 
 
-def load_provider_from_uri(uri_string):
+def load_provider_from_uri(uri_string, headers=None):
     uri = urlparse(uri_string)
     if uri.scheme == 'file':
         return IPCProvider(uri.path)
     elif uri.scheme in HTTP_SCHEMES:
-        return HTTPProvider(uri_string)
+        return HTTPProvider(uri_string, headers)
     elif uri.scheme in WS_SCHEMES:
         return WebsocketProvider(uri_string)
     else: