diff --git a/src/descanso/jsonrpc.py b/src/descanso/jsonrpc.py
index 2dcbd0b..df16775 100644
--- a/src/descanso/jsonrpc.py
+++ b/src/descanso/jsonrpc.py
@@ -291,6 +291,7 @@ def _add_body_transformer(self, spec: MethodSpec):
             self._add_request_transformer(spec, Body(field.name))
 
     def _add_default_request_body_transformers(self, spec: MethodSpec):
+        self._add_default_jsonrpc_method(spec)
         self._add_body_transformer(spec)
 
         if self._get_body_field(spec):
@@ -357,6 +358,19 @@ def _add_default_response_transformers(self, spec: MethodSpec) -> None:
                 BodyModelLoad(spec.result_type, loader=loader),
             )
 
+    def _add_default_jsonrpc_method(self, spec: MethodSpec) -> None:
+        jsonrpc_method_field = next(
+            (
+                field
+                for field in spec.fields_out
+                if field.name == EXTRA_JSON_RPC_METHOD
+                and field.dest is FieldDestination.EXTRA
+            ),
+            None,
+        )
+        if jsonrpc_method_field is None:
+            self._add_request_transformer(spec, JsonRPCMethod(spec.name))
+
     @overload
     def decorate(
         self,
@@ -403,14 +417,15 @@ def __call__(
     @overload
     def __call__(
         self,
-        method: str,
+        parameter: Transformer | str | None = None,
         *transformers: Transformer,
+        method: str | None = None,
         **params: Unpack[BuilderParams],
     ) -> "JsonRPCBuilder": ...
 
     def __call__(
         self,
-        func_or_method: str | Callable,
+        func_or_parameter: Callable | Transformer | str | None = None,
         *transformers: Transformer,
         **params: Unpack[BuilderParams],
     ) -> Any:
@@ -418,7 +433,16 @@ def __call__(
             instance = self.with_params(*transformers, **params)
         else:
             instance = self
-        if isinstance(func_or_method, str):
-            return instance.with_params(JsonRPCMethod(func_or_method))
+
+        if func_or_parameter is None:
+            return instance
+        elif isinstance(func_or_parameter, str):
+            return instance.with_params(
+                JsonRPCMethod(func_or_parameter),
+            )
+        elif isinstance(func_or_parameter, Transformer):
+            return instance.with_params(
+                func_or_parameter,
+            )
         else:
-            return instance.decorate(func_or_method)
+            return instance.decorate(func_or_parameter)
diff --git a/tests/builders/test_jsonrpc.py b/tests/builders/test_jsonrpc.py
index a419110..cf5e900 100644
--- a/tests/builders/test_jsonrpc.py
+++ b/tests/builders/test_jsonrpc.py
@@ -1,3 +1,5 @@
+from dirty_equals import IsList
+
 from descanso import JsonRPCBuilder
 from descanso.jsonrpc import (
     JsonRPCErrorRaiser,
@@ -130,3 +132,47 @@ def do(self, data: int) -> Model:
         dirty[JsonRPCErrorRaiser](),
         dirty[UnpackJsonRPC](),
     ]
+
+
+def test_default_jsonrpc_method() -> None:
+    jsonrpc = JsonRPCBuilder(url="/foo")
+
+    class Api:
+        @jsonrpc
+        def do(self, data: int) -> Model:...
+
+        @jsonrpc()
+        def work(self, data: int) -> Model:...
+
+
+    assert Api.do.spec.request_transformers == IsList(
+        dirty[JsonRPCMethod](method="do"),
+        length=...,
+    )
+    assert Api.work.spec.request_transformers == IsList(
+        dirty[JsonRPCMethod](method="work"),
+        length=...,
+    )
+
+
+def test_default_jsonrpc_method_with_transformers_and_params() -> None:
+    jsonrpc = JsonRPCBuilder(url="/foo")
+    req_transformer = Skip("0")
+    res_transformer = ErrorRaiser(codes=[200])
+
+    class Api:
+        @jsonrpc(req_transformer, res_transformer, url="/bar")
+        def do(self, data: int) -> Model:...
+
+    assert Api.do.spec.request_transformers == IsList(
+        dirty[JsonRPCMethod](method="do"),
+        req_transformer,
+        dirty[Url](original_template="/bar"),
+        check_order=False,
+        length=...,
+    )
+    assert Api.do.spec.response_transformers == IsList(
+        res_transformer,
+        check_order=False,
+        length=...,
+    )