diff --git a/ethers/contract.nim b/ethers/contract.nim
index dddd61b..f204d85 100644
--- a/ethers/contract.nim
+++ b/ethers/contract.nim
@@ -37,7 +37,8 @@ type
     blockTag*: ?BlockTag
 
   ContractError* = object of EthersError
-  Confirmable* = ?TransactionResponse
+  Confirmable* = object
+    response*: ?TransactionResponse
   EventHandler*[E: Event] = proc(event: E) {.gcsafe, raises:[].}
 
 func new*(ContractType: type Contract,
@@ -229,7 +230,8 @@ func addContractCall(procedure: var NimNode) =
             "missing {.view.}, {.pure.} or {.getter.} ?"
           .}
         let convert = customErrorConversion(`errors`)
-        return await send(`contract`, `function`, `parameters`, overrides, convert)
+        let response = await send(`contract`, `function`, `parameters`, overrides, convert)
+        Confirmable(response: response)
 
   procedure[6] =
     if procedure.isConstant:
@@ -294,7 +296,7 @@ proc subscribe*[E: Event](contract: Contract,
 
   contract.provider.subscribe(filter, logHandler)
 
-proc confirm*(tx: Future[?TransactionResponse],
+proc confirm*(tx: Future[Confirmable],
               confirmations: int = EthersDefaultConfirmations,
               timeout: int = EthersReceiptTimeoutBlks):
              Future[TransactionReceipt] {.async.} =
@@ -303,7 +305,7 @@ proc confirm*(tx: Future[?TransactionResponse],
   ## `await token.connect(signer0)
   ##          .mint(accounts[1], 100.u256)
   ##          .confirm(3)`
-  without response =? (await tx):
+  without response =? (await tx).response:
     raise newException(
       EthersError,
       "Transaction hash required. Possibly was a call instead of a send?"
diff --git a/ethers/erc20.nim b/ethers/erc20.nim
index 5b49275..f0ef2e1 100644
--- a/ethers/erc20.nim
+++ b/ethers/erc20.nim
@@ -46,17 +46,17 @@ method allowance*(token: Erc20Token,
 
 method transfer*(token: Erc20Token,
                  recipient: Address,
-                 amount: UInt256): ?TransactionResponse {.base, contract.}
+                 amount: UInt256): Confirmable {.base, contract.}
   ## Moves `amount` tokens from the caller's account to `recipient`.
 
 method approve*(token: Erc20Token,
                 spender: Address,
-                amount: UInt256): ?TransactionResponse {.base, contract.}
+                amount: UInt256): Confirmable {.base, contract.}
   ## Sets `amount` as the allowance of `spender` over the caller's tokens.
 
 method increaseAllowance*(token: Erc20Token,
                 spender: Address,
-                addedValue: UInt256): ?TransactionResponse {.base, contract.}
+                addedValue: UInt256): Confirmable {.base, contract.}
   ## Atomically increases the allowance granted to spender by the caller.
   ## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
   ## Emits an Approval event indicating the updated allowance.
@@ -65,7 +65,7 @@ method increaseAllowance*(token: Erc20Token,
 
 method decreaseAllowance*(token: Erc20Token,
                 spender: Address,
-                addedValue: UInt256): ?TransactionResponse {.base, contract.}
+                addedValue: UInt256): Confirmable {.base, contract.}
   ## Atomically decreases the allowance granted to spender by the caller.
   ## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
   ## Emits an Approval event indicating the updated allowance.
@@ -75,6 +75,6 @@ method decreaseAllowance*(token: Erc20Token,
 method transferFrom*(token: Erc20Token,
                      spender: Address,
                      recipient: Address,
-                     amount: UInt256): ?TransactionResponse {.base, contract.}
+                     amount: UInt256): Confirmable {.base, contract.}
   ## Moves `amount` tokens from `spender` to `recipient` using the allowance
   ## mechanism. `amount` is then deducted from the caller's allowance.
diff --git a/testmodule/helpers.nim b/testmodule/helpers.nim
index ced15ca..689c085 100644
--- a/testmodule/helpers.nim
+++ b/testmodule/helpers.nim
@@ -7,7 +7,7 @@ type
 method doRevert*(
   self: TestHelpers,
   revertReason: string
-): ?TransactionResponse {.base, contract.}
+): Confirmable {.base, contract.}
 
 proc new*(_: type TestHelpers, signer: Signer): TestHelpers =
   let deployment = readDeployment()
diff --git a/testmodule/testContracts.nim b/testmodule/testContracts.nim
index e5727a8..86079fa 100644
--- a/testmodule/testContracts.nim
+++ b/testmodule/testContracts.nim
@@ -13,7 +13,7 @@ import ./mocks
 type
   TestToken = ref object of Erc20Token
 
-method mint(token: TestToken, holder: Address, amount: UInt256): ?TransactionResponse {.base, contract.}
+method mint(token: TestToken, holder: Address, amount: UInt256): Confirmable {.base, contract.}
 method myBalance(token: TestToken): UInt256 {.base, contract, view.}
 
 for url in ["ws://localhost:8545", "http://localhost:8545"]:
@@ -71,24 +71,15 @@ for url in ["ws://localhost:8545", "http://localhost:8545"]:
       await token.mint(accounts[1], 100.u256)
       check (await balanceOf(token, accounts[1])) == 100.u256
 
-    test "can call non-constant functions with a ?TransactionResponse return type":
-      token = TestToken.new(token.address, provider.getSigner())
-      proc mint(token: TestToken,
-                holder: Address,
-                amount: UInt256): ?TransactionResponse {.contract.}
-      let txResp = await token.mint(accounts[1], 100.u256)
-      check txResp is (?TransactionResponse)
-      check txResp.isSome
-
     test "can call non-constant functions with a Confirmable return type":
 
       token = TestToken.new(token.address, provider.getSigner())
       proc mint(token: TestToken,
                 holder: Address,
                 amount: UInt256): Confirmable {.contract.}
-      let txResp = await token.mint(accounts[1], 100.u256)
-      check txResp is Confirmable
-      check txResp.isSome
+      let confirmable = await token.mint(accounts[1], 100.u256)
+      check confirmable is Confirmable
+      check confirmable.response.isSome
 
     test "fails to compile when function has an implementation":
       let works = compiles:
diff --git a/testmodule/testCustomErrors.nim b/testmodule/testCustomErrors.nim
index 752ea86..e66c384 100644
--- a/testmodule/testCustomErrors.nim
+++ b/testmodule/testCustomErrors.nim
@@ -113,7 +113,7 @@ suite "Contract custom errors":
       check error.arguments.two == true
 
   test "handles transaction confirmation errors":
-    proc revertsTransaction(contract: TestCustomErrors): ?TransactionResponse
+    proc revertsTransaction(contract: TestCustomErrors): Confirmable
       {.contract, errors:[ErrorWithArguments].}
 
      # skip gas estimation
diff --git a/testmodule/testErc20.nim b/testmodule/testErc20.nim
index 3643820..7f597f6 100644
--- a/testmodule/testErc20.nim
+++ b/testmodule/testErc20.nim
@@ -9,7 +9,7 @@ import ./hardhat
 type
   TestToken = ref object of Erc20Token
 
-method mint(token: TestToken, holder: Address, amount: UInt256): ?TransactionResponse {.base, contract.}
+method mint(token: TestToken, holder: Address, amount: UInt256): Confirmable {.base, contract.}
 
 for url in ["ws://localhost:8545", "http://localhost:8545"]: