diff --git a/examples/snippets/_shared.py b/examples/snippets/_shared.py
deleted file mode 100644
index d194cdf..0000000
--- a/examples/snippets/_shared.py
+++ /dev/null
@@ -1,7 +0,0 @@
-import os
-from typing import Optional
-
-
-def base_url() -> Optional[str]:
-    """Return the fixture override used by CI, or production when unset."""
-    return os.environ.get("OILPRICEAPI_BASE_URL")
diff --git a/examples/snippets/authentication_error.py b/examples/snippets/authentication_error.py
index 92c5151..4f55b8e 100644
--- a/examples/snippets/authentication_error.py
+++ b/examples/snippets/authentication_error.py
@@ -1,15 +1,18 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import AuthenticationError, OilPriceAPI
 
 
 def run() -> Dict[str, Union[bool, int]]:
     try:
-        with OilPriceAPI(base_url=base_url(), max_retries=1) as client:
+        with OilPriceAPI(
+            api_key=os.environ["OILPRICEAPI_KEY"],
+            base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+            max_retries=1,
+        ) as client:
             client.prices.get("BRENT_CRUDE_USD")
     except AuthenticationError as error:
         return {"handled": True, "status_code": error.status_code or 401}
diff --git a/examples/snippets/entitlement_error.py b/examples/snippets/entitlement_error.py
index 394714f..4b9e9b5 100644
--- a/examples/snippets/entitlement_error.py
+++ b/examples/snippets/entitlement_error.py
@@ -1,15 +1,18 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import OilPriceAPI, OilPriceAPIError
 
 
 def run() -> Dict[str, Union[bool, int]]:
     try:
-        with OilPriceAPI(base_url=base_url(), max_retries=1) as client:
+        with OilPriceAPI(
+            api_key=os.environ["OILPRICEAPI_KEY"],
+            base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+            max_retries=1,
+        ) as client:
             client.prices.get("BRENT_CRUDE_USD")
     except OilPriceAPIError as error:
         if error.status_code != 403:
diff --git a/examples/snippets/history.py b/examples/snippets/history.py
index 4878f5b..4e18740 100644
--- a/examples/snippets/history.py
+++ b/examples/snippets/history.py
@@ -1,14 +1,17 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import OilPriceAPI
 
 
 def run() -> Dict[str, Union[str, int]]:
-    with OilPriceAPI(base_url=base_url(), max_retries=1) as client:
+    with OilPriceAPI(
+        api_key=os.environ["OILPRICEAPI_KEY"],
+        base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+        max_retries=1,
+    ) as client:
         history = client.historical.get(
             commodity="BRENT_CRUDE_USD",
             interval="daily",
diff --git a/examples/snippets/latest_price.py b/examples/snippets/latest_price.py
index e75aa9a..e327446 100644
--- a/examples/snippets/latest_price.py
+++ b/examples/snippets/latest_price.py
@@ -1,14 +1,17 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import OilPriceAPI
 
 
 def run() -> Dict[str, Union[str, None]]:
-    with OilPriceAPI(base_url=base_url(), max_retries=1) as client:
+    with OilPriceAPI(
+        api_key=os.environ["OILPRICEAPI_KEY"],
+        base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+        max_retries=1,
+    ) as client:
         price = client.prices.get("BRENT_CRUDE_USD")
 
     return {
diff --git a/examples/snippets/rate_limit_error.py b/examples/snippets/rate_limit_error.py
index fcbfa6d..a3f11e0 100644
--- a/examples/snippets/rate_limit_error.py
+++ b/examples/snippets/rate_limit_error.py
@@ -1,15 +1,18 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import OilPriceAPI, RateLimitError
 
 
 def run() -> Dict[str, Union[bool, int]]:
     try:
-        with OilPriceAPI(base_url=base_url(), max_retries=1) as client:
+        with OilPriceAPI(
+            api_key=os.environ["OILPRICEAPI_KEY"],
+            base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+            max_retries=1,
+        ) as client:
             client.prices.get("BRENT_CRUDE_USD")
     except RateLimitError as error:
         return {"handled": True, "status_code": error.status_code or 429}
diff --git a/examples/snippets/timeout_error.py b/examples/snippets/timeout_error.py
index 6ba5923..0dd2d75 100644
--- a/examples/snippets/timeout_error.py
+++ b/examples/snippets/timeout_error.py
@@ -1,15 +1,19 @@
 #!/usr/bin/env python3
 import json
+import os
 from typing import Dict, Union
 
-from _shared import base_url
-
 from oilpriceapi import OilPriceAPI, TimeoutError
 
 
 def run() -> Dict[str, Union[bool, str]]:
     try:
-        with OilPriceAPI(base_url=base_url(), max_retries=1, timeout=0.05) as client:
+        with OilPriceAPI(
+            api_key=os.environ["OILPRICEAPI_KEY"],
+            base_url=os.environ.get("OILPRICEAPI_BASE_URL"),
+            max_retries=1,
+            timeout=0.05,
+        ) as client:
             client.prices.get("BRENT_CRUDE_USD")
     except TimeoutError:
         return {"handled": True, "error_type": "TimeoutError"}
diff --git a/tests/test_snippet_manifest.py b/tests/test_snippet_manifest.py
index ddaa0a4..fc18722 100644
--- a/tests/test_snippet_manifest.py
+++ b/tests/test_snippet_manifest.py
@@ -102,6 +102,9 @@ def test_manifest_validates_and_checksum_matches(tmp_path: Path) -> None:
         for example in manifest["examples"]
         if "http_status" in example
     } == {401, 403, 429}
+    for example in manifest["examples"]:
+        assert "OILPRICEAPI_KEY" in example["code"]
+        assert "_shared" not in example["code"]
     assert output.with_suffix(".json.sha256").read_text().endswith(
         "  oilpriceapi-python-snippets-v1.json\n"
     )