diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute-ClassicSwap.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute-ClassicSwap.snap
new file mode 100644
index 00000000..210b2a35
--- /dev/null
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute-ClassicSwap.snap
@@ -0,0 +1 @@
+114609
\ No newline at end of file
diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute.snap
index 4d3bbd84..cbd02fe8 100644
--- a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute.snap
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute.snap
@@ -1 +1 @@
-257101
\ No newline at end of file
+257101
diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput-ClassicSwap.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput-ClassicSwap.snap
new file mode 100644
index 00000000..c463ba34
--- /dev/null
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput-ClassicSwap.snap
@@ -0,0 +1 @@
+133790
\ No newline at end of file
diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput.snap
index bd5c8426..654ee983 100644
--- a/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput.snap
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput.snap
@@ -1 +1 @@
-283469
\ No newline at end of file
+283469
diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute-ClassicSwap.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute-ClassicSwap.snap
new file mode 100644
index 00000000..b0b2727b
--- /dev/null
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute-ClassicSwap.snap
@@ -0,0 +1 @@
+111978
\ No newline at end of file
diff --git a/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute.snap b/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute.snap
index cc2709dd..9bb1cc97 100644
--- a/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute.snap
+++ b/.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute.snap
@@ -1 +1 @@
-313198
\ No newline at end of file
+313198
diff --git a/test/foundry-tests/integration/RelayOrderReactorIntegration.t.sol b/test/foundry-tests/integration/RelayOrderReactorIntegration.t.sol
index 460f83e5..f3c70de2 100644
--- a/test/foundry-tests/integration/RelayOrderReactorIntegration.t.sol
+++ b/test/foundry-tests/integration/RelayOrderReactorIntegration.t.sol
@@ -95,6 +95,30 @@ contract RelayOrderReactorIntegrationTest is GasSnapshot, Test, Interop, PermitS
         assertEq(allowance, 0, "reactor must not have approval for tokens");
     }
 
+    /// @dev Snapshot the gas required for an encoded call
+    /// - must be before the reactor execution since pool state will have changed
+    /// - since our generated calldata assumes that the router has custody of the tokens, we must transfer them here
+    function _snapshotClassicSwapCall(
+        ERC20 inputToken,
+        uint256 inputAmount,
+        MethodParameters memory methodParameters,
+        string memory testName
+    ) internal {
+        uint256 snapshot = vm.snapshot();
+
+        vm.startPrank(swapper);
+        inputToken.transfer(UNIVERSAL_ROUTER, inputAmount);
+
+        snapStart(string.concat("RelayOrderReactorIntegrationTest-", testName, "-ClassicSwap"));
+        (bool success,) = UNIVERSAL_ROUTER.call{value: methodParameters.value}(methodParameters.data);
+        snapEnd();
+
+        require(success, "call failed");
+        vm.stopPrank();
+
+        vm.revertTo(snapshot);
+    }
+
     // swapper creates one order containing a universal router swap for 100 DAI -> USDC
     // order contains two inputs: DAI for the swap and USDC as gas payment for fillers
     // at the forked block, 95276229 is the minAmountOut
@@ -135,7 +159,9 @@ contract RelayOrderReactorIntegrationTest is GasSnapshot, Test, Interop, PermitS
 
         ERC20 tokenIn = DAI;
         ERC20 tokenOut = USDC;
+
         _checkpointBalances(swapper, filler, tokenIn, tokenOut, USDC);
+        _snapshotClassicSwapCall(tokenIn, 100 * ONE, methodParameters, "testExecute");
 
         vm.prank(filler);
         snapStart("RelayOrderReactorIntegrationTest-testExecute");
@@ -297,6 +323,7 @@ contract RelayOrderReactorIntegrationTest is GasSnapshot, Test, Interop, PermitS
         ERC20 tokenOut = DAI;
         // in this case, gas payment will go to executor (msg.sender)
         _checkpointBalances(swapper2, address(permitExecutor), tokenIn, tokenOut, USDC);
+        _snapshotClassicSwapCall(tokenIn, 100 * USDC_ONE, methodParameters, "testPermitAndExecute");
 
         vm.prank(filler);
         snapStart("RelayOrderReactorIntegrationTest-testPermitAndExecute");
@@ -367,6 +394,8 @@ contract RelayOrderReactorIntegrationTest is GasSnapshot, Test, Interop, PermitS
         routerOutputBalanceStart = UNIVERSAL_ROUTER.balance;
         fillerGasInputBalanceStart = USDC.balanceOf(filler);
 
+        _snapshotClassicSwapCall(tokenIn, 100 * ONE, methodParameters, "testExecuteWithNativeAsOutput");
+
         vm.prank(filler);
         snapStart("RelayOrderReactorIntegrationTest-testExecuteWithNativeAsOutput");
         reactor.execute{value: methodParameters.value}(signedOrder);