diff --git a/slack_sdk/web/async_client.py b/slack_sdk/web/async_client.py
index 0c047892a..3894cbfa3 100644
--- a/slack_sdk/web/async_client.py
+++ b/slack_sdk/web/async_client.py
@@ -2641,7 +2641,8 @@ async def chat_appendStream(
                 "markdown_text": markdown_text,
             }
         )
-        return await self.api_call("chat.appendStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return await self.api_call("chat.appendStream", json=kwargs)
 
     async def chat_delete(
         self,
@@ -2895,7 +2896,8 @@ async def chat_startStream(
                 "unfurl_media": unfurl_media,
             }
         )
-        return await self.api_call("chat.startStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return await self.api_call("chat.startStream", json=kwargs)
 
     async def chat_stopStream(
         self,
@@ -2920,7 +2922,8 @@ async def chat_stopStream(
             }
         )
         _parse_web_class_objects(kwargs)
-        return await self.api_call("chat.stopStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return await self.api_call("chat.stopStream", json=kwargs)
 
     async def chat_unfurl(
         self,
diff --git a/slack_sdk/web/client.py b/slack_sdk/web/client.py
index 9ff9eeb66..3314e336d 100644
--- a/slack_sdk/web/client.py
+++ b/slack_sdk/web/client.py
@@ -2631,7 +2631,8 @@ def chat_appendStream(
                 "markdown_text": markdown_text,
             }
         )
-        return self.api_call("chat.appendStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.appendStream", json=kwargs)
 
     def chat_delete(
         self,
@@ -2885,7 +2886,8 @@ def chat_startStream(
                 "unfurl_media": unfurl_media,
             }
         )
-        return self.api_call("chat.startStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.startStream", json=kwargs)
 
     def chat_stopStream(
         self,
@@ -2910,7 +2912,8 @@ def chat_stopStream(
             }
         )
         _parse_web_class_objects(kwargs)
-        return self.api_call("chat.stopStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.stopStream", json=kwargs)
 
     def chat_unfurl(
         self,
diff --git a/slack_sdk/web/legacy_client.py b/slack_sdk/web/legacy_client.py
index e83f82a1a..385f1839a 100644
--- a/slack_sdk/web/legacy_client.py
+++ b/slack_sdk/web/legacy_client.py
@@ -2643,7 +2643,8 @@ def chat_appendStream(
                 "markdown_text": markdown_text,
             }
         )
-        return self.api_call("chat.appendStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.appendStream", json=kwargs)
 
     def chat_delete(
         self,
@@ -2897,7 +2898,8 @@ def chat_startStream(
                 "unfurl_media": unfurl_media,
             }
         )
-        return self.api_call("chat.startStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.startStream", json=kwargs)
 
     def chat_stopStream(
         self,
@@ -2922,7 +2924,8 @@ def chat_stopStream(
             }
         )
         _parse_web_class_objects(kwargs)
-        return self.api_call("chat.stopStream", params=kwargs)
+        kwargs = _remove_none_values(kwargs)
+        return self.api_call("chat.stopStream", json=kwargs)
 
     def chat_unfurl(
         self,
diff --git a/tests/slack_sdk_async/web/test_web_client_coverage.py b/tests/slack_sdk_async/web/test_web_client_coverage.py
index 3900e34a2..a335f5ded 100644
--- a/tests/slack_sdk_async/web/test_web_client_coverage.py
+++ b/tests/slack_sdk_async/web/test_web_client_coverage.py
@@ -571,8 +571,10 @@ async def run_method(self, method_name, method, async_method):
                 self.api_methods_to_call.remove(method(channel="C123")["method"])
                 await async_method(channel="C123")
             elif method_name == "chat_stopStream":
-                self.api_methods_to_call.remove(method(channel="C123", ts="123.123")["method"])
-                await async_method(channel="C123", ts="123.123")
+                self.api_methods_to_call.remove(
+                    method(channel="C123", ts="123.123", blocks=[{"type": "markdown", "text": "**twelve**"}])["method"]
+                )
+                await async_method(channel="C123", ts="123.123", blocks=[{"type": "markdown", "text": "**twelve**"}])
             elif method_name == "chat_unfurl":
                 self.api_methods_to_call.remove(
                     method(