diff --git a/Deadpan-DDP.cabal b/Deadpan-DDP.cabal
--- a/Deadpan-DDP.cabal
+++ b/Deadpan-DDP.cabal
@@ -1,5 +1,5 @@
 name:                Deadpan-DDP
-version:             0.9.1.0
+version:             0.9.3.0
 synopsis:            Write clients for Meteor's DDP Protocol
 description:         The Deadpan-DDP project includes a debugging-tool, as well as a general purpose library.
                      .
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,18 @@
 # Deadpan-DDP Change Log
 
+## 0.9.3.0
+
+* RPC now only takes a list of params
+
+## 0.9.2.0
+
+* Hex GUID strings
+
+## 0.9.1.0
+
+* Better TODO Example
+* Added subscription methods that return the subscription id
+
 ## 0.9.0.0
 
 * Fixed the exit error
diff --git a/src/Web/DDP/Deadpan/Callbacks.hs b/src/Web/DDP/Deadpan/Callbacks.hs
--- a/src/Web/DDP/Deadpan/Callbacks.hs
+++ b/src/Web/DDP/Deadpan/Callbacks.hs
@@ -113,22 +113,26 @@
       randomSeed: optional JSON value           (an arbitrary client-determined seed for pseudo-random generators)
   @
 -}
-clientRPCMethod :: Text -> Maybe [EJsonValue] -> GUID -> Maybe Text -> DeadpanApp ()
+clientRPCMethod :: Text -> [EJsonValue] -> GUID -> Maybe Text -> DeadpanApp GUID
 clientRPCMethod method params rpcid seed = do
-  let msg = [("method", ejstring method)]
-         &~ do forOf_ _Just params $ \v -> modify (("params", ejarray  v):)
-               forOf_ _Just seed   $ \v -> modify (("seed",   ejstring v):)
+  let msg = [ ("method", ejstring method)
+            , ("params", ejarray  params) ]
+         &~ (forOf_ _Just seed   $ \v -> modify (("seed",   ejstring v):))
 
   sendMessage "method" (makeEJsonId rpcid <> ejobject msg)
+  return rpcid
 
+rpc :: Text -> [EJsonValue] -> DeadpanApp GUID
+rpc method params = newID >>= \guid -> clientRPCMethod method params guid Nothing
+
 -- | Like clientRPCMethod, except that it blocks, returning the response from the server.
 --
 -- TODO: Should we use the seed?
 --
-rpcWait :: Text -> Maybe [EJsonValue] -> DeadpanApp (Either EJsonValue EJsonValue)
+rpcWait :: Text -> [EJsonValue] -> DeadpanApp (Either EJsonValue EJsonValue)
 rpcWait method params = do
   mv         <- liftIO newEmptyMVar
-  rpcId      <- newID
+  rpcId      <- newID -- Can't use rpc, since we need the ID to set handlers first...
   handlerId  <- setMatchHandler (makeEJsonId rpcId) (handler mv)
   _          <- clientRPCMethod method params rpcId Nothing
   res        <- liftIO $ readMVar mv
diff --git a/src/Web/DDP/Deadpan/GUID.hs b/src/Web/DDP/Deadpan/GUID.hs
--- a/src/Web/DDP/Deadpan/GUID.hs
+++ b/src/Web/DDP/Deadpan/GUID.hs
@@ -41,6 +41,7 @@
 import System.CPUTime
 import Data.Time
 import Data.Text
+import Text.Printf
 import Data.Hashable
 import GHC.Generics
 
@@ -69,7 +70,7 @@
 newGuidInt = hash `fmap` hashTriple
 
 newGuidString :: IO String
-newGuidString = (show . hash) `fmap` hashTriple
+newGuidString = printf "%016x" `fmap` newGuidInt
 
 newGuidText :: IO Text
 newGuidText = pack `fmap` newGuidString