diff --git a/include/fc/json_rpc_client.hpp b/include/fc/json_rpc_client.hpp
index ed3edb2..c97b391 100644
--- a/include/fc/json_rpc_client.hpp
+++ b/include/fc/json_rpc_client.hpp
@@ -4,16 +4,18 @@
 #include <boost/preprocessor/repeat.hpp>
 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
 #include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
 #include <boost/preprocessor/facilities/empty.hpp>
 
 
 namespace fc { namespace json {
+        //static std::function<fc::future<R>( BOOST_PP_ENUM_PARAMS(n,A) ) >  
 
   namespace detail {
     struct rpc_member {
         #define RPC_MEMBER_FUNCTOR(z,n,IS_CONST) \
-        template<typename R, typename C, typename P BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS( n, typename A)> \
-        static fc::function<fc::future<R> BOOST_PP_COMMA_IF(n)  BOOST_PP_ENUM_PARAMS(n,A)  >  \
+        template<typename R, typename C, typename P BOOST_PP_ENUM_TRAILING_PARAMS( n, typename A)> \
+        static fc::function<fc::future<R> BOOST_PP_ENUM_TRAILING_PARAMS(n,A) > \
             functor( P, R (C::*mem_func)(BOOST_PP_ENUM_PARAMS(n,A)) IS_CONST,  \
                       const rpc_connection::ptr& c = rpc_connection::ptr(), const char* name = nullptr ) { \
             return [=](BOOST_PP_ENUM_BINARY_PARAMS(n,A,a))->fc::future<R>{ \
diff --git a/include/fc/json_rpc_connection.hpp b/include/fc/json_rpc_connection.hpp
index 8cce426..8bebdfb 100644
--- a/include/fc/json_rpc_connection.hpp
+++ b/include/fc/json_rpc_connection.hpp
@@ -25,6 +25,7 @@ namespace fc {  namespace json {
     template<typename T>
     struct pending_result_impl : virtual public promise<T>, virtual public pending_result {   
        virtual void handle_result( const fc::value& s ) {
+             slog( "cast %s", typeid(T).name() );
           this->set_value( value_cast<T>(s) );
        }
       protected:
@@ -40,13 +41,16 @@ namespace fc {  namespace json {
     };
 
 
-    template<typename R, typename Args>
+    template<typename R, typename... Args>
     struct rpc_server_method_impl : public rpc_server_method {
-      rpc_server_method_impl( const fc::function<R,Args>& f ):func(f){} 
+      //static_assert( fc::is_tuple<Args>::type::value, "params should be a tuple" );
+      rpc_server_method_impl( const fc::function<R,Args...>& f ):func(f){} 
       virtual value call( const value& v ) {
-        return value( func( fc::value_cast<Args>( v ) ) ); 
+       //      slog( "cast %s", typeid(Args).name() );
+        return value(  call_fused( func, fc::value_cast<fc::tuple<Args...> >( v ) ) ); 
+        //return value(  func( fc::value_cast<Args>( v ))  ); 
       }
-      fc::function<R,Args> func;
+      fc::function<R,Args...> func;
     };
 
     template<typename InterfaceType>
@@ -54,8 +58,8 @@ namespace fc {  namespace json {
       public:
         add_method_visitor( const fc::ptr<InterfaceType>& p, fc::json::rpc_connection& c ):_ptr(p),_con(c){}
 
-        template<typename R, typename Args>
-        void operator()( const char* name, fc::function<R,Args>& meth);
+        template<typename R, typename... Args>
+        void operator()( const char* name, fc::function<R,Args...>& meth);
 
         const fc::ptr<InterfaceType>& _ptr;
         fc::json::rpc_connection&     _con;
@@ -91,6 +95,7 @@ namespace fc {  namespace json {
 
       template<typename R, typename Args >
       void add_method( const fc::string& name, const fc::function<R,Args>& a ) {
+         static_assert( is_tuple<Args>::type::value, "is tuple" );
          this->add_method( name, rpc_server_method::ptr(new detail::rpc_server_method_impl<R,Args>(a) ) );
       }
 
@@ -121,9 +126,10 @@ namespace fc {  namespace json {
   namespace detail {
 
     template<typename InterfaceType>
-    template<typename R, typename Args>
-    void add_method_visitor<InterfaceType>::operator()( const char* name, fc::function<R,Args>& meth) {
-        _con.add_method( name, rpc_server_method::ptr( new rpc_server_method_impl<R,Args>(meth) ) );
+    template<typename R, typename... Args>
+    void add_method_visitor<InterfaceType>::operator()( const char* name, fc::function<R,Args...>& meth)    {
+        _con.add_method( name, rpc_server_method::ptr( 
+                              new rpc_server_method_impl<R,Args...>(meth) ) );
     }
 
   } // namespace detail
diff --git a/include/fc/tuple.hpp b/include/fc/tuple.hpp
index 020a908..fb77a83 100644
--- a/include/fc/tuple.hpp
+++ b/include/fc/tuple.hpp
@@ -57,6 +57,7 @@ namespace fc {
         #define ILIST_PARAMS(z,n,data) BOOST_PP_CAT(a,n)( fc::forward<BOOST_PP_CAT(AA,n)>( BOOST_PP_CAT(a,n) ) )
         #define ILIST_PARAMS_COPY(z,n,data) BOOST_PP_CAT(a,n)( t.BOOST_PP_CAT(a,n)  )
         #define VISIT_PARAMS(z,n,data) v(BOOST_PP_CAT(a,n));
+        #define LIST_MEMBERS_ON(z,n,data) data.BOOST_PP_CAT(a,n)
         #define FORWARD_PARAMS(z,n,data) fc::forward<BOOST_PP_CAT(AA,n)>(BOOST_PP_CAT(a,n))
         #define MEM_PARAMS(z,n,data) BOOST_PP_CAT(A,n) BOOST_PP_CAT(a,n);
         #define TUPLE(z,n,unused) \
@@ -77,13 +78,20 @@ namespace fc {
         template<BOOST_PP_ENUM_PARAMS( n, typename AA)> \
         tuple<BOOST_PP_ENUM_PARAMS(n,AA)> make_tuple( BOOST_PP_ENUM( n, RREF_PARAMS, unused) ) { \
           return tuple<BOOST_PP_ENUM_PARAMS(n,AA)>( BOOST_PP_ENUM( n, FORWARD_PARAMS,unused ) );  \
-        } 
+        } \
+        template<typename Functor, typename Tuple> \
+        auto call_fused( Functor f, Tuple&& t )  \
+          -> decltype( f( BOOST_PP_ENUM( n, LIST_MEMBERS_ON, t) ) ) { \
+          return f( BOOST_PP_ENUM( n, LIST_MEMBERS_ON, t) ); \
+        }
+
         template<BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(9, typename A, void)> struct tuple{};
         BOOST_PP_REPEAT_FROM_TO( 1, 8, TUPLE, unused )
 
 
         #undef FORWARD_PARAMS
         #undef RREF_PARAMS
+        #undef LIST_MEMBERS_ON
         #undef ILIST_PARAMS
         #undef ILIST_PARAMS_COPY
         #undef VISIT_PARAMS
@@ -99,6 +107,18 @@ namespace fc {
 
         inline tuple<> make_tuple(){ return tuple<>(); }
 
+        template<typename T>
+        struct is_tuple {
+          typedef fc::false_type type;
+        };
+
+        template<typename... T>
+        struct is_tuple<fc::tuple<T...> > {
+          typedef fc::true_type type;
+        };
+
+
+
   /*
   template<typename A>
   struct tuple<A,void> { 
diff --git a/include/fc/value_cast.hpp b/include/fc/value_cast.hpp
index 7998c23..60e0ce5 100644
--- a/include/fc/value_cast.hpp
+++ b/include/fc/value_cast.hpp
@@ -5,6 +5,9 @@
 #include <fc/lexical_cast.hpp>
 #include <fc/numeric_cast.hpp>
 #include <fc/value_io.hpp>
+#include <fc/tuple.hpp>
+
+#include <typeinfo>
 
 namespace fc {
 
@@ -26,9 +29,9 @@ namespace fc {
          virtual void operator()( const double& v      ){ m_out = fc::numeric_cast<T>(v); }
          virtual void operator()( const bool& v        ){ m_out = fc::numeric_cast<T>(v); }
          virtual void operator()( const fc::string& v ) { m_out = fc::lexical_cast<T>(v); }
-         virtual void operator()( const value::object&  )      { FC_THROW_MSG("bad cast");             }
-         virtual void operator()( const value::array&  )       { FC_THROW_MSG("bad cast");             }
-         virtual void operator()( )                     { FC_THROW_MSG("bad cast");             }
+         virtual void operator()( const value::object&  )      { FC_THROW_MSG("bad cast"); }
+         virtual void operator()( const value::array&  )       { FC_THROW_MSG("bad cast"); }
+         virtual void operator()( )                     { FC_THROW_MSG("bad cast");        }
          private:
          T& m_out;
        };
@@ -48,10 +51,10 @@ namespace fc {
          virtual void operator()( const float& v       ){ m_out = fc::lexical_cast<fc::string>(v); }
          virtual void operator()( const double& v      ){ m_out = fc::lexical_cast<fc::string>(v); }
          virtual void operator()( const bool& v        ){ m_out = fc::lexical_cast<fc::string>(v); }
-         virtual void operator()( const fc::string& v ){ m_out = v;                                   }
-         virtual void operator()( const value::object&  )      { FC_THROW_MSG("bad cast");                       }
-         virtual void operator()( const value::array&  )       { FC_THROW_MSG("bad cast");                       }
-         virtual void operator()( )                     { FC_THROW_MSG("bad cast");                       }
+         virtual void operator()( const fc::string& v ){ m_out = v;                                }
+         virtual void operator()( const value::object&  )      { FC_THROW_MSG("bad cast"); }
+         virtual void operator()( const value::array&  )       { FC_THROW_MSG("bad cast"); }
+         virtual void operator()( )                     { FC_THROW_MSG("bad cast");        }
      
          private:
          fc::string& m_out;
@@ -122,14 +125,45 @@ namespace fc {
          virtual void operator()( const value::array&  )       { FC_THROW_MSG("bad cast");}
          virtual void operator()( )                     { }
        };
+        template<typename IsTuple=fc::false_type>
+        struct cast_if_tuple {
+          template<typename T>
+          static T cast(  const value& v ) {
+             slog( "cast non tuple %s", typeid(T).name() );
+             T out;
+             v.visit(cast_visitor<T>(out));
+             return out;
+          }
+        };
+        template<>
+        struct cast_if_tuple<fc::true_type> {
+          struct member_visitor {
+             member_visitor( const value& v )
+             :_val(v),idx(0){}
+             template<typename Member>
+             void operator()( Member& m ) {
+               m = value_cast<Member>(_val[idx]);
+               ++idx;
+             }
+             const value& _val;
+             int    idx;
+          };
+
+          template<typename T>
+          static T cast(  const value& v ) {
+             T out;
+             out.visit( member_visitor(v) );
+             slog( "cast tuple" );
+            // v.visit(cast_visitor<T>(out));
+             return out;
+          }
+        };
 
         template<typename IsReflected=fc::false_type>
         struct cast_if_reflected {
           template<typename T>
           static T cast(  const value& v ) {
-             T out;
-             v.visit(cast_visitor<T>(out));
-             return out;
+            return cast_if_tuple<typename is_tuple<T>::type>::template cast<T>(v);
           }
         };
 
diff --git a/include/fc/value_io.hpp b/include/fc/value_io.hpp
index 8aef083..de9c678 100644
--- a/include/fc/value_io.hpp
+++ b/include/fc/value_io.hpp
@@ -132,7 +132,7 @@ namespace fc {
          }
          else {
             if( !is_optional< typename fc::remove_reference<decltype(c.*p)>::type >::type::value ) {
-                wlog( "unable to find name: '%1%'",name);
+                wlog( "unable to find name: '%s'",name);
             }
          }
       }
diff --git a/src/json.cpp b/src/json.cpp
index f6b9ac6..8097b03 100644
--- a/src/json.cpp
+++ b/src/json.cpp
@@ -587,7 +587,7 @@ char* read_key_val( value::object& obj, bool sc, char* in, char* end, fc::json::
     if( sc ) { // if we expect a ,
       if( *name != ',' ) { // but didn't get one
         if( *name != '}' )
-            wlog( "expected ',' or '}' but got %1%", name ); // warn and accept name
+            wlog( "expected ',' or '}' but got '%s'", name ); // warn and accept name
       } else { // we got the exepcted , read the expected name 
         name = fc::json::read_value( name_end, end, name_end );
       }
@@ -757,15 +757,15 @@ fc::value to_value( char* start, char* end, error_collector& ec ) {
     }
     case 'n': {
       temp_set move_end(ve,'\0');
-      if( strcmp(s,"null" ) ) return value();
+      if( strcmp(s,"null" ) == 0) return value();
     }
     case 't': {
       temp_set move_end(ve,'\0');
-      if( strcmp(s,"true" ) ) return true;
+      if( strcmp(s,"true" ) == 0) return true;
     }
     case 'f': {
       temp_set move_end(ve,'\0');
-      if( strcmp(s,"false" ) ) return false;
+      if( strcmp(s,"false" ) == 0) return false;
     }
 
     default:
diff --git a/src/json_rpc_connection.cpp b/src/json_rpc_connection.cpp
index cf9ad7b..2854473 100644
--- a/src/json_rpc_connection.cpp
+++ b/src/json_rpc_connection.cpp
@@ -64,6 +64,7 @@ namespace fc { namespace json {
 
           value nul;
           const value& params = (p_itr != end) ? p_itr->val : nul;
+          slog( "params '%s'", to_string( params ).c_str() );
 
           if( id_itr != end ) { // capture reply
             try {
diff --git a/src/sstream.cpp b/src/sstream.cpp
index ad2cc17..bb05b13 100644
--- a/src/sstream.cpp
+++ b/src/sstream.cpp
@@ -33,11 +33,9 @@ namespace fc {
     return *this;
   }
   size_t   stringstream::readsome( char* buf, size_t len ) {
-    slog("");
     return my->ss.readsome(buf,len);
   }
   istream&   stringstream::read( char* buf, size_t len ) {
-    slog("");
     my->ss.read(buf,len);
     return *this;
   }
diff --git a/src/tcp_socket.cpp b/src/tcp_socket.cpp
index a9fcdd8..a4e089e 100644
--- a/src/tcp_socket.cpp
+++ b/src/tcp_socket.cpp
@@ -9,9 +9,8 @@ namespace fc {
 
   class tcp_socket::impl {
     public:
-      impl():_sock( fc::asio::default_io_service() ){ slog( "sock %p", this); }
+      impl():_sock( fc::asio::default_io_service() ){ }
       ~impl(){
-        slog( "~sock %p", this );
         if( _sock.is_open() ) _sock.close();
       }