diff --git a/src/entities/protocols/uniswap.ts b/src/entities/protocols/uniswap.ts
index b44c96a5..41638895 100644
--- a/src/entities/protocols/uniswap.ts
+++ b/src/entities/protocols/uniswap.ts
@@ -30,8 +30,9 @@ export type FlatFeeOptions = {
 // the existing router permit object doesn't include enough data for permit2
 // so we extend swap options with the permit2 permit
 // when safe mode is enabled, the SDK will add an extra ETH sweep for security
+// when useRouterBalance is enabled the SDK will use the balance in the router for the swap
 export type SwapOptions = Omit<RouterSwapOptions, 'inputTokenPermit'> & {
-  directSend?: boolean
+  useRouterBalance?: boolean
   inputTokenPermit?: Permit2Permit
   flatFee?: FlatFeeOptions
   safeMode?: boolean
@@ -55,7 +56,7 @@ export class UniswapTrade implements Command {
     if (!!options.fee && !!options.flatFee) throw new Error('Only one fee option permitted')
 
     if (this.inputRequiresWrap) this.payerIsUser = false
-    else if (this.options.directSend) this.payerIsUser = false
+    else if (this.options.useRouterBalance) this.payerIsUser = false
     else this.payerIsUser = true
   }
 
@@ -65,7 +66,7 @@ export class UniswapTrade implements Command {
 
   encode(planner: RoutePlanner, _config: TradeConfig): void {
     // If the input currency is the native currency, we need to wrap it with the router as the recipient
-    if (this.trade.inputAmount.currency.isNative) {
+    if (this.inputRequiresWrap) {
       // TODO: optimize if only one v2 pool we can directly send this to the pool
       planner.addCommand(CommandType.WRAP_ETH, [
         ROUTER_AS_RECIPIENT,
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index 1e504859..c1262557 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -1,4 +1,3 @@
-import { ChainId, Token } from '@uniswap/sdk-core'
 import { BigNumber } from 'ethers'
 
 type ChainConfig = {
diff --git a/test/forge/interop.json b/test/forge/interop.json
index d4c1e555..0bc773c9 100644
--- a/test/forge/interop.json
+++ b/test/forge/interop.json
@@ -247,4 +247,4 @@
     "calldata": "0x24856bc30000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000030b000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000de0b6b3a76400000000000000000000000000000000000000000000000000000000000000000120000000000000000000000000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0000000000000000000000000000000000000000000000000de0b6b3a764000000000000000000000000000000000000000000000000003eb3459f0ce6ae000b00000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000042c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000bb8a0b86991c6218b36c1d19d4a2e9eb0ce3606eb480001f46b175474e89094c44da98b954eedeac495271d0f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0000000000000000000000000000000000000000000000000000000000000000",
     "value": "1000000000000000000"
   }
-}
+}
\ No newline at end of file