diff --git a/README.md b/README.md
index aa5df8e..60ec73f 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,10 @@ The returned result is a `pandas.DataFrame` indexed by `datetime`.
 For `get`, the value column is named `value`.
 For `get_many`, each column is named after the asset slug.
 
+> **Note (v0.13.0):** `san.get`, `san.get_many`, and `AsyncBatch.get`/`.get_many`
+> now raise `SanError` when passed unknown keyword arguments instead of silently ignoring them.
+> If a parameter you expect is rejected, upgrade sanpy with `pip install --upgrade sanpy`.
+
 ### Single asset
 
 ```python
@@ -652,6 +656,21 @@ san.get(
 )
 ```
 
+## Only finalized data
+
+For metrics whose values can be recomputed after publication (see `canMutate` in metric metadata), pass `only_finalized_data=True` to restrict the response to data points that have passed their stabilization period:
+
+```python
+san.get(
+    "price_usd",
+    slug="bitcoin",
+    from_date="utc_now-30d",
+    to_date="utc_now",
+    interval="1d",
+    only_finalized_data=True
+)
+```
+
 ## Rate limit tools
 
 Four utility functions help you handle [API rate limits](https://academy.santiment.net/sanapi/rate-limits/):
diff --git a/san/api_config.py b/san/api_config.py
index 541c0ea..a8317cb 100644
--- a/san/api_config.py
+++ b/san/api_config.py
@@ -9,3 +9,6 @@ class ApiConfig:
     pool_connections = 10
     # Maximum number of reusable connections kept per pool.
     pool_maxsize = 10
+    # When True, passing unknown keyword arguments to san.get / san.get_many /
+    # AsyncBatch raises SanError instead of being silently ignored.
+    strict_kwargs = True
diff --git a/san/async_batch.py b/san/async_batch.py
index df17345..0c44ec6 100644
--- a/san/async_batch.py
+++ b/san/async_batch.py
@@ -3,6 +3,7 @@
 
 from san.sanbase_graphql_helper import QUERY_MAPPING
 from san.error import SanError
+from san.param_validation import validate_kwargs
 
 
 def task(request):
@@ -27,9 +28,11 @@ def __init__(self):
         self.queries = []
 
     def get(self, dataset, **kwargs):
+        validate_kwargs("AsyncBatch.get", kwargs)
         self.queries.append(["get", dataset, kwargs])
 
     def get_many(self, dataset, **kwargs):
+        validate_kwargs("AsyncBatch.get_many", kwargs)
         self.queries.append(["get_many", dataset, kwargs])
 
     def execute(self, max_workers=10):
diff --git a/san/batch.py b/san/batch.py
index c533b7e..52d8916 100644
--- a/san/batch.py
+++ b/san/batch.py
@@ -4,6 +4,7 @@
 from san.graphql import execute_gql
 from san.transform import transform_timeseries_data_query_result
 from san.error import SanError
+from san.param_validation import validate_kwargs
 
 
 class Batch:
@@ -11,6 +12,7 @@ def __init__(self):
         self.queries = []
 
     def get(self, dataset, **kwargs):
+        validate_kwargs("Batch.get", kwargs)
         self.queries.append([dataset, kwargs])
 
     def execute(self):
diff --git a/san/get.py b/san/get.py
index 0477c7b..a290ed3 100644
--- a/san/get.py
+++ b/san/get.py
@@ -5,6 +5,7 @@
 from san.query import get_gql_query, parse_dataset
 from san.transform import transform_timeseries_data_query_result
 from san.error import SanError
+from san.param_validation import validate_kwargs
 
 
 def get(dataset, **kwargs):
@@ -36,6 +37,7 @@ def get(dataset, **kwargs):
         from_date="utc_now-60d",
         to_date="utc_now-40d")
     """
+    validate_kwargs("san.get", kwargs)
     query, slug = parse_dataset(dataset)
     if slug or query in NO_SLUG_QUERIES:
         return __get_metric_slug_string_selector(query, slug, dataset, **kwargs)
diff --git a/san/get_many.py b/san/get_many.py
index bc38a26..ce2bf5b 100644
--- a/san/get_many.py
+++ b/san/get_many.py
@@ -3,6 +3,7 @@
 from san.query import parse_dataset
 from san.transform import transform_timeseries_data_per_slug_query_result
 from san.error import SanError
+from san.param_validation import validate_kwargs
 
 
 def get_many(dataset, **kwargs):
@@ -13,6 +14,7 @@ def get_many(dataset, **kwargs):
         from_date="2020-01-01"
         to_date="2020-01-10")
     """
+    validate_kwargs("san.get_many", kwargs)
     query, slug = parse_dataset(dataset)
     return __get_many(query, **kwargs)
 
diff --git a/san/param_validation.py b/san/param_validation.py
new file mode 100644
index 0000000..14cc238
--- /dev/null
+++ b/san/param_validation.py
@@ -0,0 +1,48 @@
+from san.api_config import ApiConfig
+from san.error import SanError
+
+_SUPPORTED_KWARGS = frozenset(
+    {
+        "slug",
+        "slugs",
+        "selector",
+        "from_date",
+        "to_date",
+        "interval",
+        "aggregation",
+        "include_incomplete_data",
+        "only_finalized_data",
+        "transform",
+        "version",
+        "return_fields",
+        "address",
+        "transaction_type",
+        "number_of_holders",
+        "limit",
+        "size",
+        "social_volume_type",
+        "source",
+        "search_text",
+        "idx",
+    }
+)
+
+_PUBLIC_KWARGS = _SUPPORTED_KWARGS - {"idx"}
+
+
+def validate_kwargs(func_name, kwargs):
+    if not ApiConfig.strict_kwargs:
+        return
+    unsupported = sorted(set(kwargs) - _SUPPORTED_KWARGS)
+    if not unsupported:
+        return
+    raise SanError(
+        "{func}() received unsupported parameter(s): {bad}. "
+        "Supported parameters: {ok}. "
+        "If you expect a parameter to be supported, upgrade sanpy "
+        "with `pip install --upgrade sanpy`.".format(
+            func=func_name,
+            bad=", ".join(unsupported),
+            ok=", ".join(sorted(_PUBLIC_KWARGS)),
+        )
+    )
diff --git a/san/sanbase_graphql.py b/san/sanbase_graphql.py
index 7155143..295c85a 100644
--- a/san/sanbase_graphql.py
+++ b/san/sanbase_graphql.py
@@ -211,6 +211,7 @@ def __choose_selector_or_slug(slug, **kwargs):
 
 
 def get_metric_timeseries_data(idx, metric, slug=None, **kwargs):
+    only_finalized_data_arg = _only_finalized_data_arg_helper(kwargs)
     kwargs = sgh.transform_query_args("get_metric", **kwargs)
     selector_or_slug = __choose_selector_or_slug(slug, **kwargs)
     version_arg = _version_arg_helper(kwargs)
@@ -227,17 +228,25 @@ def get_metric_timeseries_data(idx, metric, slug=None, **kwargs):
             interval: \"{interval}\"
             aggregation: {aggregation}
             includeIncompleteData: {include_incomplete_data}
+            {only_finalized_data_arg}
         )
     }}
     """
     ).format(
-        idx=idx, metric=metric, version_arg=version_arg, selector_or_slug=selector_or_slug, transform_arg=transform_arg, **kwargs
+        idx=idx,
+        metric=metric,
+        version_arg=version_arg,
+        selector_or_slug=selector_or_slug,
+        transform_arg=transform_arg,
+        only_finalized_data_arg=only_finalized_data_arg,
+        **kwargs,
     )
 
     return query_str
 
 
 def get_metric_timeseries_data_per_slug(idx, metric, slugs=None, **kwargs):
+    only_finalized_data_arg = _only_finalized_data_arg_helper(kwargs)
     kwargs = sgh.transform_query_args("get_metric", **kwargs)
     selector_or_slugs = __choose_selector_or_slugs(slugs, **kwargs)
     version_arg = _version_arg_helper(kwargs)
@@ -254,6 +263,7 @@ def get_metric_timeseries_data_per_slug(idx, metric, slugs=None, **kwargs):
             interval: \"{interval}\"
             aggregation: {aggregation}
             includeIncompleteData: {include_incomplete_data}
+            {only_finalized_data_arg}
         )
     }}
     """
@@ -263,6 +273,7 @@ def get_metric_timeseries_data_per_slug(idx, metric, slugs=None, **kwargs):
         version_arg=version_arg,
         selector_or_slugs=selector_or_slugs,
         transform_arg=transform_arg,
+        only_finalized_data_arg=only_finalized_data_arg,
         **kwargs,
     )
 
@@ -276,6 +287,15 @@ def _version_arg_helper(kwargs):
     return ""
 
 
+def _only_finalized_data_arg_helper(kwargs):
+    value = kwargs.pop("only_finalized_data", None)
+    if value is None:
+        return ""
+    if not isinstance(value, bool):
+        raise SanError(f'"only_finalized_data" must be a bool, got: {value!r}')
+    return f"onlyFinalizedData: {'true' if value else 'false'}"
+
+
 def _transform_arg_helper(kwargs):
     transform_arg_str = ""
     if "transform" in kwargs and isinstance(kwargs["transform"], dict):
diff --git a/san/tests/test_get.py b/san/tests/test_get.py
index 72f934b..8897312 100644
--- a/san/tests/test_get.py
+++ b/san/tests/test_get.py
@@ -417,6 +417,91 @@ def test_invalid_method():
         san.get("invalid_method/slug")
 
 
+def test_get_raises_on_unsupported_kwarg():
+    with pytest.raises(SanError, match="unsupported parameter"):
+        san.get("price_usd", slug="bitcoin", vlkajsdsakd=123)
+
+
+def test_get_many_raises_on_unsupported_kwarg():
+    with pytest.raises(SanError, match="unsupported parameter"):
+        san.get_many("price_usd", slugs=["bitcoin"], foo_bar=1)
+
+
+def test_batch_get_raises_on_unsupported_kwarg():
+    batch = Batch()
+    with pytest.raises(SanError, match="unsupported parameter"):
+        batch.get("price_usd/bitcoin", nonsense=True)
+
+
+def test_async_batch_raises_on_unsupported_kwarg():
+    from san import AsyncBatch
+
+    ab = AsyncBatch()
+    with pytest.raises(SanError, match="unsupported parameter"):
+        ab.get("price_usd", slug="bitcoin", typo_param=1)
+    with pytest.raises(SanError, match="unsupported parameter"):
+        ab.get_many("price_usd", slugs=["bitcoin"], typo_param=1)
+
+
+@patch("san.transport.requests.Session.post")
+def test_strict_kwargs_disabled_allows_unknown(mock, test_response):
+    api_call_result = {"query_0": {"timeseriesDataJson": []}}
+    mock.return_value = test_response(status_code=200, data=deepcopy(api_call_result))
+
+    san.ApiConfig.strict_kwargs = False
+    try:
+        san.get("price_usd", slug="bitcoin", from_date="2026-01-01", to_date="2026-01-02", vlkajsdsakd=123)
+    finally:
+        san.ApiConfig.strict_kwargs = True
+
+
+@patch("san.transport.requests.Session.post")
+def test_get_with_only_finalized_data(mock, test_response):
+    api_call_result = {"query_0": {"timeseriesDataJson": [{"datetime": "2026-01-01T00:00:00Z", "value": 1.0}]}}
+    mock.return_value = test_response(status_code=200, data=deepcopy(api_call_result))
+
+    san.get(
+        "price_usd",
+        slug="bitcoin",
+        from_date="2026-01-01",
+        to_date="2026-01-02",
+        interval="1d",
+        only_finalized_data=True,
+    )
+
+    query = mock.call_args.kwargs["json"]["query"]
+    assert "onlyFinalizedData: true" in query
+
+
+@patch("san.transport.requests.Session.post")
+def test_get_many_with_only_finalized_data(mock, test_response):
+    api_call_result = {"query_0": {"timeseriesDataPerSlugJson": []}}
+    mock.return_value = test_response(status_code=200, data=deepcopy(api_call_result))
+
+    san.get_many(
+        "price_usd",
+        slugs=["bitcoin", "ethereum"],
+        from_date="2026-01-01",
+        to_date="2026-01-02",
+        interval="1d",
+        only_finalized_data=False,
+    )
+
+    query = mock.call_args.kwargs["json"]["query"]
+    assert "onlyFinalizedData: false" in query
+
+
+@patch("san.transport.requests.Session.post")
+def test_get_omits_only_finalized_data_when_absent(mock, test_response):
+    api_call_result = {"query_0": {"timeseriesDataJson": []}}
+    mock.return_value = test_response(status_code=200, data=deepcopy(api_call_result))
+
+    san.get("price_usd", slug="bitcoin", from_date="2026-01-01", to_date="2026-01-02", interval="1d")
+
+    query = mock.call_args.kwargs["json"]["query"]
+    assert "onlyFinalizedData" not in query
+
+
 def test_rate_limits():
     exception = SanError("API Rate Limit Reached. Try again in 366 seconds(7 minutes)")
 
diff --git a/setup.py b/setup.py
index 8d0eb4e..9ccab3d 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setuptools.setup(
     name="sanpy",
-    version="0.13.0",
+    version="0.14.0",
     author="Santiment",
     author_email="admin@santiment.net",
     description="Package for Santiment API access with python",