diff --git a/setup.cfg b/setup.cfg
index 2a71350..71738bb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -37,6 +37,7 @@ wsme.protocols =
 packages =
     wsme
     wsme.protocols
+    wsme.rest
     wsme.tests
 
 extra_files =
diff --git a/wsme/__init__.py b/wsme/__init__.py
index 902011f..35109ec 100644
--- a/wsme/__init__.py
+++ b/wsme/__init__.py
@@ -1,8 +1,10 @@
-from wsme.api import sig, expose, validate
+from wsme.api import signature
+from wsme.rest import expose, validate
 from wsme.root import WSRoot
 from wsme.types import wsattr, wsproperty, Unset
 
 __all__ = [
-    'expose', 'validate', 'sig',
+    'expose', 'validate', 'signature',
     'WSRoot',
-    'wsattr', 'wsproperty', 'Unset']
+    'wsattr', 'wsproperty', 'Unset'
+]
diff --git a/wsme/api.py b/wsme/api.py
index ff63bd1..9cadd28 100644
--- a/wsme/api.py
+++ b/wsme/api.py
@@ -1,31 +1,6 @@
 import functools
 import inspect
 
-__all__ = ['expose', 'validate']
-
-APIPATH_MAXLEN = 20
-
-
-def scan_api(controller, path=[]):
-    """
-    Recursively iterate a controller api entries, while setting
-    their :attr:`FunctionDefinition.path`.
-    """
-    for name in dir(controller):
-        if name.startswith('_'):
-            continue
-        a = getattr(controller, name)
-        if inspect.ismethod(a):
-            if hasattr(a, '_wsme_definition'):
-                yield path + [name], a._wsme_definition
-        elif inspect.isclass(a):
-            continue
-        else:
-            if len(path) > APIPATH_MAXLEN:
-                raise ValueError("Path is too long: " + str(path))
-            for i in scan_api(a, path + [name]):
-                yield i
-
 
 def iswsmefunction(f):
     return hasattr(f, '_wsme_definition')
@@ -85,14 +60,6 @@ class FunctionDefinition(object):
         #: If the body carry the datas of a single argument, its type
         self.body_type = None
 
-        #: True if this function is exposed by a protocol and not in
-        #: the api tree, which means it is not part of the api.
-        self.protocol_specific = False
-
-        #: Override the contenttype of the returned value.
-        #: Make sense only with :attr:`protocol_specific` functions.
-        self.contenttype = None
-
         #: Dictionnary of protocol-specific options.
         self.extra_options = None
 
@@ -121,93 +88,45 @@ class FunctionDefinition(object):
         for arg in self.arguments:
             arg.resolve_type(registry)
 
-
-class expose(object):
-    """
-    Decorator that expose a function.
-
-    :param return_type: Return type of the function
-
-    Example::
-
-        class MyController(object):
-            @expose(int)
-            def getint(self):
-                return 1
-    """
-    def __init__(self, return_type=None, body=None, multiple_expose=False,
-                 **options):
-        self.return_type = return_type
+    def set_options(self, body=None, **extra_options):
         self.body_type = body
-        self.multiple_expose = multiple_expose
+        self.extra_options = extra_options
+
+    def set_arg_types(self, argspec, arg_types):
+        args, varargs, keywords, defaults = argspec
+        if args[0] == 'self':
+            args = args[1:]
+        arg_types = list(arg_types)
+        if self.body_type is not None:
+            arg_types.append(self.body_type)
+        for i, argname in enumerate(args):
+            datatype = arg_types[i]
+            mandatory = defaults is None or i < (len(args) - len(defaults))
+            default = None
+            if not mandatory:
+                default = defaults[i - (len(args) - len(defaults))]
+            self.arguments.append(FunctionArgument(argname, datatype,
+                                                 mandatory, default))
+
+
+class signature(object):
+    def __init__(self, *types, **options):
+        self.return_type = types[0] if types else None
+        self.arg_types = types[1:] if len(types) > 1 else None
+        self.wrap = options.pop('wrap', False)
         self.options = options
 
     def __call__(self, func):
-        if self.multiple_expose:
+        argspec = getargspec(func)
+        if self.wrap:
             func = wrapfunc(func)
         fd = FunctionDefinition.get(func)
         if fd.extra_options is not None:
             raise ValueError("This function is already exposed")
         fd.return_type = self.return_type
-        fd.body_type = self.body_type
-        fd.extra_options = self.options
+        fd.set_options(**self.options)
+        if self.arg_types:
+                fd.set_arg_types(argspec, self.arg_types)
         return func
 
-
-class sig(object):
-    def __init__(self, return_type, *param_types, **options):
-        self.expose = expose(return_type, **options)
-        self.validate = validate(*param_types)
-
-    def __call__(self, func):
-        func = self.expose(func)
-        func = self.validate(func)
-        return func
-
-
-class pexpose(object):
-    def __init__(self, return_type=None, contenttype=None):
-        self.return_type = return_type
-        self.contenttype = contenttype
-
-    def __call__(self, func):
-        fd = FunctionDefinition.get(func)
-        fd.return_type = self.return_type
-        fd.protocol_specific = True
-        fd.contenttype = self.contenttype
-        return func
-
-
-class validate(object):
-    """
-    Decorator that define the arguments types of a function.
-
-
-    Example::
-
-        class MyController(object):
-            @expose(str)
-            @validate(datetime.date, datetime.time)
-            def format(self, d, t):
-                return d.isoformat() + ' ' + t.isoformat()
-    """
-    def __init__(self, *param_types):
-        self.param_types = param_types
-
-    def __call__(self, func):
-        fd = FunctionDefinition.get(func)
-        args, varargs, keywords, defaults = getargspec(func)
-        if args[0] == 'self':
-            args = args[1:]
-        param_types = list(self.param_types)
-        if fd.body_type is not None:
-            param_types.append(fd.body_type)
-        for i, argname in enumerate(args):
-            datatype = param_types[i]
-            mandatory = defaults is None or i < (len(args) - len(defaults))
-            default = None
-            if not mandatory:
-                default = defaults[i - (len(args) - len(defaults))]
-            fd.arguments.append(FunctionArgument(argname, datatype,
-                                                 mandatory, default))
-        return func
+sig = signature
diff --git a/wsme/pecan.py b/wsme/pecan.py
index 107842b..a9d9766 100644
--- a/wsme/pecan.py
+++ b/wsme/pecan.py
@@ -51,7 +51,7 @@ def wsexpose(*args, **kwargs):
         content_type='application/xml',
         generic=False
     )
-    sig = wsme.sig(*args, **kwargs)
+    sig = wsme.signature(*args, **kwargs)
 
     def decorate(f):
         sig(f)
diff --git a/wsme/rest/__init__.py b/wsme/rest/__init__.py
new file mode 100644
index 0000000..0968770
--- /dev/null
+++ b/wsme/rest/__init__.py
@@ -0,0 +1,77 @@
+import inspect
+import wsme.api
+
+APIPATH_MAXLEN = 20
+
+
+class expose(object):
+    def __init__(self, *args, **kwargs):
+        self.signature = wsme.api.signature(*args, **kwargs)
+
+    def __call__(self, func):
+        return self.signature(func)
+
+    @classmethod
+    def with_method(self, method, *args, **kwargs):
+        kwargs['method'] = method
+        return expose(*args, **kwargs)
+
+    @classmethod
+    def get(cls, *args, **kwargs):
+        return expose.with_method('GET', *args, **kwargs)
+
+    @classmethod
+    def post(cls, *args, **kwargs):
+        return expose.with_method('POST', *args, **kwargs)
+
+    @classmethod
+    def put(cls, *args, **kwargs):
+        return expose.with_method('PUT', *args, **kwargs)
+
+    @classmethod
+    def delete(cls, *args, **kwargs):
+        return expose.with_method('DELETE', *args, **kwargs)
+
+
+class validate(object):
+    """
+    Decorator that define the arguments types of a function.
+
+
+    Example::
+
+        class MyController(object):
+            @expose(str)
+            @validate(datetime.date, datetime.time)
+            def format(self, d, t):
+                return d.isoformat() + ' ' + t.isoformat()
+    """
+    def __init__(self, *param_types):
+        self.param_types = param_types
+
+    def __call__(self, func):
+        argspec = wsme.api.getargspec(func)
+        fd = wsme.api.FunctionDefinition.get(func)
+        fd.set_arg_types(argspec, self.param_types)
+        return func
+
+
+def scan_api(controller, path=[]):
+    """
+    Recursively iterate a controller api entries, while setting
+    their :attr:`FunctionDefinition.path`.
+    """
+    for name in dir(controller):
+        if name.startswith('_'):
+            continue
+        a = getattr(controller, name)
+        if inspect.ismethod(a):
+            if wsme.api.iswsmefunction(a):
+                yield path + [name], a._wsme_definition
+        elif inspect.isclass(a):
+            continue
+        else:
+            if len(path) > APIPATH_MAXLEN:
+                raise ValueError("Path is too long: " + str(path))
+            for i in scan_api(a, path + [name]):
+                yield i
diff --git a/wsme/root.py b/wsme/root.py
index c1c3ff0..f91e2cc 100644
--- a/wsme/root.py
+++ b/wsme/root.py
@@ -8,9 +8,9 @@ import six
 
 import webob
 
-from wsme import exc
+from wsme.exc import ClientSideError, MissingArgument, UnknownFunction
 from wsme.protocols import getprotocol
-from wsme.api import scan_api
+from wsme.rest import scan_api
 from wsme import spore
 import wsme.types
 
@@ -125,7 +125,7 @@ class WSRoot(object):
         :rtype: list of (path, :class:`FunctionDefinition`)
         """
         if self._api is None:
-            self._api = [i for i in self._scan_api(self)]
+            self._api = list(self._scan_api(self))
             for path, fdef in self._api:
                 fdef.resolve_types(self.__registry__)
         return self._api
@@ -167,7 +167,7 @@ class WSRoot(object):
                 context.path = protocol.extract_path(context)
 
             if context.path is None:
-                raise exc.ClientSideError(u(
+                raise ClientSideError(u(
                     'The %s protocol was unable to extract a function '
                     'path from the request') % protocol.name)
 
@@ -176,7 +176,7 @@ class WSRoot(object):
 
             for arg in context.funcdef.arguments:
                 if arg.mandatory and arg.name not in kw:
-                    raise exc.MissingArgument(arg.name)
+                    raise MissingArgument(arg.name)
 
             txn = self.begin()
             try:
@@ -186,9 +186,6 @@ class WSRoot(object):
                 txn.abort()
                 raise
 
-            if context.funcdef.protocol_specific \
-                    and context.funcdef.return_type is None:
-                return result
             else:
                 # TODO make sure result type == a._wsme_definition.return_type
                 return protocol.encode_result(context, result)
@@ -196,7 +193,7 @@ class WSRoot(object):
         except Exception:
             e = sys.exc_info()[1]
             infos = self._format_exception(sys.exc_info())
-            if isinstance(e, exc.ClientSideError):
+            if isinstance(e, ClientSideError):
                 request.client_errorcount += 1
             else:
                 request.server_errorcount += 1
@@ -263,8 +260,6 @@ class WSRoot(object):
                         res.status = 500
                     else:
                         res.status = 200
-                if request.calls[0].funcdef:
-                    res_content_type = request.calls[0].funcdef.contenttype
             else:
                 res.status = protocol.get_response_status(request)
                 res_content_type = protocol.get_response_contenttype(request)
@@ -308,7 +303,7 @@ class WSRoot(object):
                 break
 
         if not hasattr(a, '_wsme_definition'):
-            raise exc.UnknownFunction('/'.join(path))
+            raise UnknownFunction('/'.join(path))
 
         definition = a._wsme_definition
 
@@ -317,7 +312,7 @@ class WSRoot(object):
     def _format_exception(self, excinfo):
         """Extract informations that can be sent to the client."""
         error = excinfo[1]
-        if isinstance(error, exc.ClientSideError):
+        if isinstance(error, ClientSideError):
             r = dict(faultcode="Client",
                      faultstring=error.faultstring)
             log.warning("Client-side error: %s" % r['faultstring'])
diff --git a/wsme/tests/test_api.py b/wsme/tests/test_api.py
index 6ed562e..75a70a2 100644
--- a/wsme/tests/test_api.py
+++ b/wsme/tests/test_api.py
@@ -1,13 +1,13 @@
 # encoding=utf8
 
-from six import u, b
+from six import b
 import sys
 
 import unittest
 import webtest
 
 from wsme import WSRoot, expose, validate
-from wsme.api import scan_api, pexpose
+from wsme.rest import scan_api
 from wsme.api import FunctionArgument, FunctionDefinition
 from wsme.types import iscomplex
 import wsme.types
@@ -15,41 +15,6 @@ import wsme.types
 from wsme.tests.test_protocols import DummyProtocol
 
 
-def test_pexpose():
-    class Proto(DummyProtocol):
-        def extract_path(self, context):
-            if context.request.path.endswith('ufunc'):
-                return ['_protocol', 'dummy', 'ufunc']
-            else:
-                return ['_protocol', 'dummy', 'func']
-
-        @pexpose(None, "text/xml")
-        def func(self):
-            return "<p></p>"
-
-        @pexpose(None, "text/xml")
-        def ufunc(self):
-            return u("<p>\xc3\xa9</p>")
-
-    fd = FunctionDefinition.get(Proto.func)
-    assert fd.return_type is None
-    assert fd.protocol_specific
-    assert fd.contenttype == "text/xml"
-
-    p = Proto()
-    r = WSRoot()
-    r.addprotocol(p)
-
-    app = webtest.TestApp(r.wsgiapp())
-
-    res = app.get('/func')
-
-    assert res.status_int == 200
-    assert res.body == b("<p></p>"), res.body
-    res = app.get('/ufunc')
-    assert res.unicode_body == u("<p>\xc3\xa9</p>"), res.body
-
-
 class TestController(unittest.TestCase):
     def test_expose(self):
         class MyWS(WSRoot):
diff --git a/wsme/tests/test_restjson.py b/wsme/tests/test_restjson.py
index 31e0c99..dcaf373 100644
--- a/wsme/tests/test_restjson.py
+++ b/wsme/tests/test_restjson.py
@@ -1,20 +1,19 @@
 import base64
 import datetime
 import decimal
-import urllib
 
 import wsme.tests.protocol
 
 try:
     import simplejson as json
 except:
-    import json
+    import json  # noqa
 
 import wsme.protocols.restjson
 from wsme.protocols.restjson import fromjson, tojson
 from wsme.utils import parse_isodatetime, parse_isotime, parse_isodate
 from wsme.types import isusertype, register_type
-from wsme.api import expose, validate
+from wsme.rest import expose, validate
 
 
 import six
@@ -23,7 +22,7 @@ from six import b, u
 if six.PY3:
     from urllib.parse import urlencode
 else:
-    from urllib import urlencode
+    from urllib import urlencode  # noqa
 
 
 def prepare_value(value, datatype):