diff --git a/src/entities/protocols/uniswap.ts b/src/entities/protocols/uniswap.ts
index f31a20e..83db7bf 100644
--- a/src/entities/protocols/uniswap.ts
+++ b/src/entities/protocols/uniswap.ts
@@ -16,11 +16,12 @@ import {
   partitionMixedRouteByProtocol,
 } from '@uniswap/router-sdk'
 import { Permit2Permit } from '../../utils/inputTokens'
-import { Currency, TradeType, CurrencyAmount, Percent } from '@uniswap/sdk-core'
+import { Currency, TradeType, CurrencyAmount, Percent, Fraction } from '@uniswap/sdk-core'
 import { Command, RouterTradeType, TradeConfig } from '../Command'
 import { SENDER_AS_RECIPIENT, ROUTER_AS_RECIPIENT, CONTRACT_BALANCE, ETH_ADDRESS } from '../../utils/constants'
 import { encodeFeeBips } from '../../utils/numbers'
 import { BigNumber, BigNumberish } from 'ethers'
+import JSBI from 'jsbi'
 
 export type FlatFeeOptions = {
   amount: BigNumberish
@@ -177,11 +178,16 @@ function addV2Swap<TInput extends Currency, TOutput extends Currency>(
     tradeType
   )
 
+  const ZERO = JSBI.BigInt(0);
+  console.log(typeof ZERO, ZERO instanceof JSBI)
+  console.log(new Fraction(ZERO) instanceof Fraction)
+
+
   console.log(
     'ur-sdk',
     options.slippageTolerance.toFixed(),
     options.slippageTolerance.isPercent,
-    options.slippageTolerance
+    options.slippageTolerance.lessThan(new Fraction(ZERO))
   )
 
   if (tradeType == TradeType.EXACT_INPUT) {
diff --git a/yarn.lock b/yarn.lock
index 76a6047..8e80e7f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5728,9 +5728,9 @@ js-yaml@^3.13.1:
     esprima "^4.0.0"
 
 jsbi@^3.1.4:
-  version "3.2.5"
-  resolved "https://registry.npmjs.org/jsbi/-/jsbi-3.2.5.tgz"
-  integrity sha512-aBE4n43IPvjaddScbvWRA2YlTzKEynHzu7MqOyTipdHucf/VxS63ViCjxYRg86M8Rxwbt/GfzHl1kKERkt45fQ==
+  version "3.1.4"
+  resolved "https://registry.yarnpkg.com/jsbi/-/jsbi-3.1.4.tgz#9654dd02207a66a4911b4e4bb74265bc2cbc9dd0"
+  integrity sha512-52QRRFSsi9impURE8ZUbzAMCLjPm4THO7H2fcuIvaaeFTbSysvkodbQQXIVsNgq/ypDbq6dJiuGKL0vZ/i9hUg==
 
 jsbn@~0.1.0:
   version "0.1.1"