@@ -4,6 +4,49 @@ All notable changes to the OilPriceAPI Python SDK will be documented in this fil
 
 ## [Unreleased]
 
+## [1.17.0] - 2026-10-03
+
+### Fixed
+
+- **Eight methods called paths the API does not route, so every call
+  returned 404 (#153).** Sync and async are both fixed.
+  - `storage.history(code, period="90d")` now calls
+    `/v1/storage/history/{code}`. It accepts `CUSHING_STORAGE`, `US_SPR`,
+    `SINGAPORE_STORAGE_TOTAL`, `ARA_STORAGE_TOTAL` (or `"cushing"` / `"spr"`)
+    and a `period` of `7d`, `30d`, `90d`, `1y` or `all`. It returns the
+    API's `{code, period, history, statistics}` object. The
+    `start_date`/`end_date` arguments are gone: the route never accepted
+    them.
+  - `bunker_fuels.spreads(from_port, to_port, grade=None)` now calls
+    `/v1/bunker-fuels/spreads/ports`. Both ports are required.
+  - `bunker_fuels.historical(port, fuel_type=None, start_date=None,
+    end_date=None, interval=None)` now calls
+    `/v1/bunker-fuels/historical/{port}`. `fuel_type` filters the
+    returned `historical_data` by grade.
+  - `forecasts.accuracy()` and `forecasts.archive()` now call
+    `/v1/forecasts/monthly/accuracy` and `/archive`. While monthly
+    forecasts are unpublished, the API's `not_available` 404 raises
+    `DataNotFoundError`.
+  - `drilling.trends()`, `drilling.basin()` and `futures.spreads()` have
+    no API route. They now emit `DeprecationWarning` and raise
+    `ValidationError(code="ENDPOINT_NOT_AVAILABLE", status_code=None)`
+    without sending a request. The error names the replacement:
+    `rig_counts.trends()`, `ei.drilling_productivity.by_basin()` and the
+    new `futures.calendar_spreads(contract)`. They will be removed in 2.0.
+  - Invalid storage codes, periods, ports and fuel types are rejected
+    locally, before any request is sent.
+- **The price-alert polling example in `EXAMPLES.md` now polls hourly**
+  instead of every 30 minutes, halving its daily calls. It now shows how to
+  compute the budget against a plan allowance.
+
+### Added
+
+- `futures.calendar_spreads(contract)` for `/v1/futures/{slug}/spreads`.
+- `tests/unit/test_api_path_contract.py` fails when any `/v1` path in the SDK
+  is missing from the API route table snapshot
+  (`tests/fixtures/api_paths.json.fixture`). Refresh the snapshot with
+  `scripts/refresh_api_paths.py`.
+
 ## [1.16.0] - 2026-09-13
 
 ### Added
 
@@ -456,10 +456,13 @@ def monitor_prices():
             elif price.value < limits['low']:
                 send_alert(commodity, price.value, limits['low'], 'BELOW')
 
-        # Example caller-selected interval. Derive production polling from the
+        # Each pass makes one request per commodity, so the daily total grows
+        # with len(thresholds) and shrinks with the sleep interval. Check that
+        # total against your plan's daily allowance before adding commodities
+        # or shortening the interval. Derive production polling from the
         # account's current limit/reset response and the source timestamps.
         # See https://docs.oilpriceapi.com/guides/rate-limiting#how-often-to-poll
-        time.sleep(1800)
+        time.sleep(3600)
 
 if __name__ == '__main__':
     print("Starting price monitor...")
 
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from datetime import date, datetime
-from typing import Any, Dict, List, Optional, Sequence, Union
+from typing import Any, Dict, List, Optional, Sequence, Union, cast
 
 from . import _fuel_surcharge_common as fs
 from ._subscriptions_common import (
@@ -54,6 +54,15 @@
 )
 from .resources import _calculated_metrics as metrics_ops
 from .resources._futures_slug import normalize_futures_slug
+from .resources._removed import removed_endpoint
+from .resources._route_args import (
+    bunker_grade_prefix,
+    bunker_port_code,
+    bunker_spread_params,
+    filter_bunker_history,
+    storage_history_code,
+    storage_history_period,
+)
 from .resources.ei._envelopes import ei_data, unwrap_ei_collection, unwrap_ei_object
 from .resources.ei.well_permits import unwrap_well_permit_search_response
 from .resources.subscriptions import SubscriptionEventsPage
@@ -442,10 +451,16 @@ async def intraday(self, contract: str) -> List[Dict[str, Any]]:
         return response
 
     async def spreads(self, contract1: str, contract2: str) -> Dict[str, Any]:
-        response = await self.client.request(
-            method="GET", path="/v1/futures/spreads",
-            params={"contract1": contract1, "contract2": contract2}
+        """Deprecated: no API route (#153). Use ``calendar_spreads(contract)``."""
+        removed_endpoint(
+            "client.futures.spreads()",
+            "client.futures.calendar_spreads(contract)",
         )
+
+    async def calendar_spreads(self, contract: str) -> Dict[str, Any]:
+        """Calendar spreads for one contract family (``/v1/futures/{slug}/spreads``)."""
+        slug = normalize_futures_slug(contract)
+        response = await self.client.request(method="GET", path=f"/v1/futures/{slug}/spreads")
         if "data" in response:
             return response["data"]
         return response
@@ -512,25 +527,17 @@ async def regional(self, region: Optional[str] = None) -> Dict[str, Any]:
             return response["data"]
         return response
 
-    async def history(
-        self,
-        code: str,
-        start_date: Optional[Union[str, date, datetime]] = None,
-        end_date: Optional[Union[str, date, datetime]] = None
-    ) -> List[Dict[str, Any]]:
-        params = {}
-        if start_date is not None:
-            params["start_date"] = format_date(start_date)
-        if end_date is not None:
-            params["end_date"] = format_date(end_date)
+    async def history(self, code: str, period: str = "90d") -> Dict[str, Any]:
+        """Storage history (``/v1/storage/history/{code}``). See the sync docstring."""
         response = await self.client.request(
-            method="GET", path=f"/v1/storage/{code}/history", params=params
+            method="GET",
+            path=f"/v1/storage/history/{storage_history_code(code)}",
+            params={"period": storage_history_period(period)},
         )
         if "data" in response:
             return response["data"]
         return response
 
-
 class AsyncRigCountsResource:
     def __init__(self, client):
         self.client = client
@@ -604,30 +611,41 @@ async def compare(self, ports: List[str]) -> Dict[str, Any]:
             return response["data"]
         return response
 
-    async def spreads(self) -> Dict[str, Any]:
-        response = await self.client.request(method="GET", path="/v1/bunker-fuels/spreads")
+    async def spreads(self, from_port: str, to_port: str, grade: Optional[str] = None) -> Dict[str, Any]:
+        """Port-to-port spread (``/v1/bunker-fuels/spreads/ports``)."""
+        response = await self.client.request(
+            method="GET",
+            path="/v1/bunker-fuels/spreads/ports",
+            params=bunker_spread_params(from_port, to_port, grade),
+        )
         if "data" in response:
             return response["data"]
         return response
 
     async def historical(
         self,
         port: str,
-        fuel_type: str,
+        fuel_type: Optional[str] = None,
         start_date: Optional[Union[str, date, datetime]] = None,
-        end_date: Optional[Union[str, date, datetime]] = None
-    ) -> List[Dict[str, Any]]:
-        params: Dict[str, Any] = {"port": port, "fuel_type": fuel_type}
+        end_date: Optional[Union[str, date, datetime]] = None,
+        interval: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """Port history (``/v1/bunker-fuels/historical/{port}``). See the sync docstring."""
+        prefix = bunker_grade_prefix(fuel_type)
+        params: Dict[str, Any] = {}
         if start_date is not None:
-            params["start_date"] = format_date(start_date)
+            params["from"] = format_date(start_date)
         if end_date is not None:
-            params["end_date"] = format_date(end_date)
+            params["to"] = format_date(end_date)
+        if interval is not None:
+            params["interval"] = interval
         response = await self.client.request(
-            method="GET", path="/v1/bunker-fuels/historical", params=params
+            method="GET",
+            path=f"/v1/bunker-fuels/historical/{bunker_port_code(port)}",
+            params=params,
         )
-        if "data" in response:
-            return response["data"]
-        return response
+        data = response["data"] if "data" in response else response
+        return filter_bunker_history(data, prefix)
 
     async def export(self, format: str = "json") -> Any:
         response = await self.client.request(
@@ -718,21 +736,23 @@ async def monthly(self, commodity: Optional[str] = None) -> Dict[str, Any]:
         return response
 
     async def accuracy(self) -> Dict[str, Any]:
-        response = await self.client.request(method="GET", path="/v1/forecasts/accuracy")
+        """Forecast accuracy (``/v1/forecasts/monthly/accuracy``)."""
+        response = await self.client.request(method="GET", path="/v1/forecasts/monthly/accuracy")
         if "data" in response:
-            return response["data"]
-        return response
+            return cast(Dict[str, Any], response["data"])
+        return cast(Dict[str, Any], response)
 
     async def archive(self, year: Optional[int] = None) -> List[Dict[str, Any]]:
-        params = {}
+        """Archived forecasts (``/v1/forecasts/monthly/archive``)."""
+        params: Dict[str, Any] = {}
         if year:
             params["year"] = year
         response = await self.client.request(
-            method="GET", path="/v1/forecasts/archive", params=params
+            method="GET", path="/v1/forecasts/monthly/archive", params=params
         )
         if "data" in response:
-            return response["data"]
-        return response
+            return cast(List[Dict[str, Any]], response["data"])
+        return cast(List[Dict[str, Any]], response)
 
     async def get(self, period: str, commodity: Optional[str] = None) -> Dict[str, Any]:
         params = {}
@@ -793,13 +813,9 @@ async def summary(self) -> Dict[str, Any]:
             return response["data"]
         return response
 
-    async def trends(self, **params) -> List[Dict[str, Any]]:
-        response = await self.client.request(
-            method="GET", path="/v1/drilling-intelligence/trends", params=params
-        )
-        if "data" in response:
-            return response["data"]
-        return response
+    async def trends(self, **params: Any) -> List[Dict[str, Any]]:
+        """Deprecated: no API route (#153). Use ``client.rig_counts.trends()``."""
+        removed_endpoint("client.drilling.trends()", "client.rig_counts.trends()")
 
     async def frac_spreads(self, **params) -> List[Dict[str, Any]]:
         response = await self.client.request(
@@ -842,13 +858,11 @@ async def wells_drilled(self, **params) -> List[Dict[str, Any]]:
         return response
 
     async def basin(self, name: str) -> Dict[str, Any]:
-        response = await self.client.request(
-            method="GET", path=f"/v1/drilling-intelligence/basin/{name}"
+        """Deprecated: no API route (#153). Use ``client.ei.drilling_productivity.by_basin()``."""
+        removed_endpoint(
+            "client.drilling.basin()",
+            "client.ei.drilling_productivity.by_basin()",
         )
-        if "data" in response:
-            return response["data"]
-        return response
-
 
 class AsyncWellProductionResource:
     """Async resource for US well production data (beta).
 
@@ -0,0 +1,35 @@
+"""Guard for SDK methods whose API route does not exist.
+
+Each of these methods used to send a request to a path the API has never
+routed, so every call came back as a 404 that read like a data problem
+(#153). They now fail locally, before any request is sent, and name the
+supported replacement.
+"""
+
+import warnings
+from typing import NoReturn
+
+from ..exceptions import ValidationError
+
+
+def removed_endpoint(method: str, alternative: str) -> NoReturn:
+    """Warn and raise for a method with no backing API route.
+
+    Args:
+        method: Public method name, e.g. ``"client.drilling.trends()"``.
+        alternative: The supported call to use instead.
+
+    Raises:
+        ValidationError: Always, with ``code="ENDPOINT_NOT_AVAILABLE"`` and
+            ``status_code=None`` because no request was sent.
+    """
+    message = (
+        f"{method} is not available: the API has no route for it. "
+        f"Use {alternative} instead. This method will be removed in 2.0."
+    )
+    warnings.warn(message, DeprecationWarning, stacklevel=3)
+    raise ValidationError(
+        message,
+        status_code=None,
+        code="ENDPOINT_NOT_AVAILABLE",
+    )