usdt

.gas-snapshot

@@ -15,24 +15,25 @@ AdminWithdrawTest:test_tokens() (gas: 879919)
 LiquidityHubAccessTest:test_revert_execute_onlyAllowed() (gas: 15345)
 LiquidityHubAccessTest:test_revert_reactorCallback_onlyReactor() (gas: 10576)
 LiquidityHubAccessTest:test_revert_validationCallback_onlySelf() (gas: 11914)
-LiquidityHubExecuteTest:test_decayOnNegativeSlippage() (gas: 341784)
-LiquidityHubExecuteTest:test_emitEvents() (gas: 355157)
-LiquidityHubExecuteTest:test_gas() (gas: 236423)
-LiquidityHubExecuteTest:test_gasToAdmin() (gas: 338749)
-LiquidityHubExecuteTest:test_inTokenSlippage() (gas: 377108)
-LiquidityHubExecuteTest:test_longLimit() (gas: 341287)
-LiquidityHubExecuteTest:test_nativeOutput() (gas: 302419)
-LiquidityHubExecuteTest:test_nativeOutputSwapperLimit() (gas: 302496)
-LiquidityHubExecuteTest:test_nativeSlippageToRef() (gas: 302090)
-LiquidityHubExecuteTest:test_optionalRef() (gas: 301076)
-LiquidityHubExecuteTest:test_optionalRefshare() (gas: 301346)
-LiquidityHubExecuteTest:test_revert_swapperLimit() (gas: 332086)
-LiquidityHubExecuteTest:test_slippageToRef() (gas: 341418)
-LiquidityHubExecuteTest:test_swapperLimit() (gas: 339278)
-LiquidityHubExecuteTest:test_swapperLimitRespectsSurplus() (gas: 343993)
-PartialOrderE2ETest:test_e2e_exactMirrorMatch() (gas: 452677)
-PartialOrderE2ETest:test_e2e_multiplePartialInputs() (gas: 624846)
-PartialOrderE2ETest:test_e2e_partialInputMatch() (gas: 472533)
+LiquidityHubExecuteTest:test_decayOnNegativeSlippage() (gas: 352300)
+LiquidityHubExecuteTest:test_emitEvents() (gas: 365709)
+LiquidityHubExecuteTest:test_gas() (gas: 259247)
+LiquidityHubExecuteTest:test_gasToAdmin() (gas: 349265)
+LiquidityHubExecuteTest:test_inTokenSlippage() (gas: 387624)
+LiquidityHubExecuteTest:test_longLimit() (gas: 351803)
+LiquidityHubExecuteTest:test_nativeOutput() (gas: 302429)
+LiquidityHubExecuteTest:test_nativeOutputSwapperLimit() (gas: 302506)
+LiquidityHubExecuteTest:test_nativeSlippageToRef() (gas: 302100)
+LiquidityHubExecuteTest:test_optionalRef() (gas: 313209)
+LiquidityHubExecuteTest:test_optionalRefshare() (gas: 313425)
+LiquidityHubExecuteTest:test_revert_swapperLimit() (gas: 362502)
+LiquidityHubExecuteTest:test_slippageToRef() (gas: 351912)
+LiquidityHubExecuteTest:test_swapperLimit() (gas: 349794)
+LiquidityHubExecuteTest:test_swapperLimitRespectsSurplus() (gas: 354509)
+LiquidityHubExecuteTest:test_usdtOutput() (gas: 277)
+PartialOrderE2ETest:test_e2e_exactMirrorMatch() (gas: 463135)
+PartialOrderE2ETest:test_e2e_multiplePartialInputs() (gas: 635296)
+PartialOrderE2ETest:test_e2e_partialInputMatch() (gas: 482991)
 PartialOrderReactorTest:test_execute_swapFullAmount() (gas: 199131)
 PartialOrderReactorTest:test_execute_swapPartial() (gas: 309736)
 PartialOrderReactorTest:test_execute_swapPartialOdd() (gas: 199121)

src/LiquidityHub.sol

@@ -136,8 +136,13 @@ contract LiquidityHub is IReactorCallback, IValidationCallback {
     }
 
     function _outputReactor(address token, uint256 amount) private {
-        if (token == address(0)) Address.sendValue(payable(address(reactor)), amount);
-        else IERC20(token).safeIncreaseAllowance(address(reactor), amount);
+        if (token == address(0)) {
+            Address.sendValue(payable(address(reactor)), amount);
+        } else {
+            uint256 allowance = IERC20(token).allowance(address(this), address(reactor));
+            IERC20(token).safeApprove(address(reactor), 0);
+            IERC20(token).safeApprove(address(reactor), allowance + amount);
+        }
     }
 
     function _transfer(address token, address to, uint256 amount) private {

test/LiquidityHub.execute.t.sol

@@ -104,6 +104,22 @@ contract LiquidityHubExecuteTest is BaseTest {
         assertEq(swapper.balance, outAmount + (slippage / (100 - refshare)));
     }
 
+    function test_usdtOutput() public {
+        if (block.chainid != 1) return;
+
+        outToken = ERC20Mock(0xdAC17F958D2ee523a2206206994597C13D831ec7);
+
+        SignedOrder memory order = _order();
+        deal(address(outToken), address(config.executor), outAmount + gasAmount + slippage);
+
+        IMulticall3.Call[] memory calls = new IMulticall3.Call[](0);
+        hoax(config.admin.owner());
+        config.executor.execute(order, calls, 0);
+
+        assertEq(inToken.balanceOf(swapper), 9 ether);
+        assertEq(swapper.balance, outAmount + (slippage / (100 - refshare)));
+    }
+
     function test_slippageToRef() public {
         SignedOrder memory order = _order();