diff --git a/packages/syft/src/syft/client/api.py b/packages/syft/src/syft/client/api.py
index c40677221e2..8842e27e0dc 100644
--- a/packages/syft/src/syft/client/api.py
+++ b/packages/syft/src/syft/client/api.py
@@ -17,7 +17,10 @@
 
 # third party
 from nacl.exceptions import BadSignatureError
+from pydantic import BaseModel
+from pydantic import ConfigDict
 from pydantic import EmailStr
+from pydantic import TypeAdapter
 from result import OkErr
 from result import Result
 from typeguard import check_type
@@ -85,6 +88,14 @@
 IPYNB_BACKGROUND_PREFIXES = ["_ipy", "_repr", "__ipython", "__pydantic"]
 
 
+def _has_config_dict(t: Any) -> bool:
+    return (
+        isinstance(t, type)
+        and issubclass(t, BaseModel)
+        or hasattr(t, "__pydantic_config__")
+    )
+
+
 class APIRegistry:
     __api_registry__: dict[tuple, SyftAPI] = OrderedDict()
 
@@ -1321,30 +1332,25 @@ def validate_callable_args_and_kwargs(
                 t = index_syft_by_module_name(param.annotation)
             else:
                 t = param.annotation
-            msg = None
-            try:
-                if t is not inspect.Parameter.empty:
-                    if isinstance(t, _GenericAlias) and type(None) in t.__args__:
-                        success = False
-                        for v in t.__args__:
-                            if issubclass(v, EmailStr):
-                                v = str
-                            try:
-                                check_type(value, v)  # raises Exception
-                                success = True
-                                break  # only need one to match
-                            except Exception:  # nosec
-                                pass
-                        if not success:
-                            raise TypeError()
-                    else:
-                        check_type(value, t)  # raises Exception
-            except TypeError:
-                _type_str = getattr(t, "__name__", str(t))
-                msg = f"`{key}` must be of type `{_type_str}` not `{type(value).__name__}`"
 
-            if msg:
-                return SyftError(message=msg)
+            if t is not inspect.Parameter.empty:
+                try:
+                    config_kw = (
+                        {"config": ConfigDict(arbitrary_types_allowed=True)}
+                        if not _has_config_dict(t)
+                        else {}
+                    )
+
+                    # TypeAdapter only accepts `config` arg if `t` does not
+                    # already contain a ConfigDict
+                    # i.e model_config in BaseModel and __pydantic_config__ in
+                    # other types.
+                    TypeAdapter(t, **config_kw).validate_python(value)
+                except Exception:
+                    _type_str = getattr(t, "__name__", str(t))
+                    return SyftError(
+                        message=f"`{key}` must be of type `{_type_str}` not `{type(value).__name__}`"
+                    )
 
             _valid_kwargs[key] = value