diff --git a/polygon/rest/base.py b/polygon/rest/base.py
index 8afbd330..7e35da27 100644
--- a/polygon/rest/base.py
+++ b/polygon/rest/base.py
@@ -126,6 +126,8 @@ def _get_params(
                 val = caller_locals.get(argname, v.default)
                 if isinstance(val, Enum):
                     val = val.value
+                elif isinstance(val, bool):
+                    val = str(val).lower()
                 elif isinstance(val, datetime):
                     val = int(val.timestamp() * self.time_mult(datetime_res))
                 if val is not None:
diff --git a/test_rest/mocks/v1/indicators/ema/AAPL&window=5&adjusted=False&timestamp.lte=1478393873000&timestamp.gte=1477972800000.json b/test_rest/mocks/v1/indicators/ema/AAPL&window=5&adjusted=false&timestamp.lte=1478393873000&timestamp.gte=1477972800000.json
similarity index 100%
rename from test_rest/mocks/v1/indicators/ema/AAPL&window=5&adjusted=False&timestamp.lte=1478393873000&timestamp.gte=1477972800000.json
rename to test_rest/mocks/v1/indicators/ema/AAPL&window=5&adjusted=false&timestamp.lte=1478393873000&timestamp.gte=1477972800000.json
diff --git a/test_rest/mocks/v1/indicators/rsi/AAPL&window=20&timespan=minute&adjusted=True&timestamp.gt=2022-08-18.json b/test_rest/mocks/v1/indicators/rsi/AAPL&window=20&timespan=minute&adjusted=true&timestamp.gt=2022-08-18.json
similarity index 100%
rename from test_rest/mocks/v1/indicators/rsi/AAPL&window=20&timespan=minute&adjusted=True&timestamp.gt=2022-08-18.json
rename to test_rest/mocks/v1/indicators/rsi/AAPL&window=20&timespan=minute&adjusted=true&timestamp.gt=2022-08-18.json
diff --git a/test_rest/mocks/v1/indicators/sma/AAPL&window=30&timespan=quarter&timestamp=1483958600&expand_underlying=True.json b/test_rest/mocks/v1/indicators/sma/AAPL&window=30&timespan=quarter&timestamp=1483958600&expand_underlying=true.json
similarity index 100%
rename from test_rest/mocks/v1/indicators/sma/AAPL&window=30&timespan=quarter&timestamp=1483958600&expand_underlying=True.json
rename to test_rest/mocks/v1/indicators/sma/AAPL&window=30&timespan=quarter&timestamp=1483958600&expand_underlying=true.json
diff --git a/test_rest/mocks/v1/open-close/AAPL/2005-04-01&adjusted=True.json b/test_rest/mocks/v1/open-close/AAPL/2005-04-01&adjusted=true.json
similarity index 100%
rename from test_rest/mocks/v1/open-close/AAPL/2005-04-01&adjusted=True.json
rename to test_rest/mocks/v1/open-close/AAPL/2005-04-01&adjusted=true.json
diff --git a/test_rest/mocks/v2/aggs/grouped/locale/us/market/stocks/2005-04-04&adjusted=True.json b/test_rest/mocks/v2/aggs/grouped/locale/us/market/stocks/2005-04-04&adjusted=true.json
similarity index 100%
rename from test_rest/mocks/v2/aggs/grouped/locale/us/market/stocks/2005-04-04&adjusted=True.json
rename to test_rest/mocks/v2/aggs/grouped/locale/us/market/stocks/2005-04-04&adjusted=true.json