diff --git a/act/EVM/TH.hs b/act/EVM/TH.hs
index fff6d09..735e129 100644
--- a/act/EVM/TH.hs
+++ b/act/EVM/TH.hs
@@ -48,6 +48,7 @@ makeTxCall tx@(EthTransaction addr caller meth args amt gas) = do
   resetState
   assign (#tx % #isCreate) False
   execState (loadContract addr) <$> get >>= put
+  assign (#state % #callvalue) (Lit amt)
   assign (#state % #calldata) (makeCallData tx)
   assign (#state % #caller) (litAddr caller)
   assign (#state % #gas) gas
diff --git a/act/Examples/HEVM.hs b/act/Examples/HEVM.hs
index 572307e..72953a0 100644
--- a/act/Examples/HEVM.hs
+++ b/act/Examples/HEVM.hs
@@ -11,8 +11,13 @@ module Examples.HEVM where
 import Act.Prelude
 import Control.Monad.Trans.State.Strict
 import Data.DoubleWord
+import Data.Text (Text)
+import Data.Text qualified as T
+import Data.Text.IO qualified as T
+import Data.Map qualified as Map
 import Debug.Trace
 import EVM.Exec
+import EVM.Format
 import EVM.Fetch (zero)
 import EVM.Stepper (evm, interpret, runFully)
 import EVM.TH
@@ -116,10 +121,25 @@ initial = loadContracts [("Piggybank", "solitidy/Withdraw.sol")]
 outcome = evaluate (playerAutomatic initial) (Kleisli (const $ pure (dummyTx 10)) :- Nil) void
 
 testExec = do
-  makeTxCall (deposit 100)
-  run
-
--- makeTxCall (dummyTx 20)
---  run
-
-interp = interpret (zero 0 (Just 0)) initial (evm testExec >> runFully)
+  evm $ makeTxCall (deposit 100)
+  runFully
+  evm $ makeTxCall (dummyTx 20)
+  runFully
+
+showVM :: VM -> Text
+showVM vm = T.unlines
+  [ "Contracts:"
+  , indent 2 . T.unlines . Map.elems $ Map.mapWithKey (\a c -> T.pack (show a) <> " :\n  " <> showContract c) vm.env.contracts
+  , "Storage: " <> (formatExpr vm.env.storage)
+  , "CallValue: " <> (formatExpr vm.state.callvalue)
+  , "Result: " <> (T.pack $ show vm.result)
+  ]
+
+showContract :: Contract -> Text
+showContract c = T.unlines
+  [ "balance: " <> (T.pack $ show c.balance)
+  ]
+
+interp = do
+  vm <- interpret (zero 0 (Just 0)) initial (testExec)
+  T.putStrLn (showVM vm)
diff --git a/solitidy/Withdraw.sol b/solitidy/Withdraw.sol
index dbe3927..857c850 100644
--- a/solitidy/Withdraw.sol
+++ b/solitidy/Withdraw.sol
@@ -1,4 +1,3 @@
-
 pragma solidity >=0.8.2 <0.9.0;
 
 /**
@@ -23,6 +22,8 @@ contract Piggybank {
     function retrieve(uint256 _amount) public  {
         require(_balance >= _amount, "insufficient funds.");
         _balance = _balance - _amount;
-        msg.sender.call{value: _amount};
+        (bool res, ) = msg.sender.call{value: _amount}("");
+        require(res, "transfer failed!");
     }
 }
+