diff --git a/polaris/polaris/sep6/deposit.py b/polaris/polaris/sep6/deposit.py
index ec791515..6d6841d1 100644
--- a/polaris/polaris/sep6/deposit.py
+++ b/polaris/polaris/sep6/deposit.py
@@ -136,7 +136,7 @@ def parse_request_args(request: Request) -> Dict:
     except (ValueError, MemoInvalidException):
         return {"error": render_error_response(_("invalid 'memo' for 'memo_type'"))}
 
-    return {
+    args = {
         "asset": asset,
         "memo_type": memo_type,
         "memo": memo,
@@ -144,3 +144,10 @@ def parse_request_args(request: Request) -> Dict:
         "type": request.GET.get("type"),
         **extract_sep9_fields(request.GET),
     }
+
+    # add remaining extra params, it's on the anchor to validate them
+    for param, value in request.GET.items():
+        if param not in args:
+            args[param] = value
+
+    return args
diff --git a/polaris/polaris/sep6/withdraw.py b/polaris/polaris/sep6/withdraw.py
index 97c1c866..968daf02 100644
--- a/polaris/polaris/sep6/withdraw.py
+++ b/polaris/polaris/sep6/withdraw.py
@@ -113,7 +113,7 @@ def parse_request_args(request: Request) -> Dict:
     if not request.GET.get("dest"):
         return {"error": render_error_response(_("'dest' is required"))}
 
-    return {
+    args = {
         "asset": asset,
         "memo_type": memo_type,
         "memo": memo,
@@ -124,6 +124,13 @@ def parse_request_args(request: Request) -> Dict:
         **extract_sep9_fields(request.GET),
     }
 
+    # add remaining extra params, it's on the anchor to validate them
+    for param, value in request.GET.items():
+        if param not in args:
+            args[param] = value
+
+    return args
+
 
 def validate_response(
     args: Dict, integration_response: Dict, transaction: Transaction