diff --git a/src/constants/chains.ts b/src/constants/chains.ts
index 6ac91b57d0a..e89feb5ae99 100644
--- a/src/constants/chains.ts
+++ b/src/constants/chains.ts
@@ -1,4 +1,4 @@
-import { ChainId, SUPPORTED_CHAINS, SupportedChainsType } from '@uniswap/sdk-core'
+import { ChainId, SupportedChainsType } from '@uniswap/sdk-core'
 
 export const UniWalletSupportedChains = [ChainId.MAINNET, ChainId.ARBITRUM_ONE, ChainId.OPTIMISM, ChainId.POLYGON]
 
@@ -31,7 +31,10 @@ export function isSupportedChain(
   if (featureFlags && chainId && chainId in featureFlags) {
     return featureFlags[chainId]
   }
-  return !!chainId && SUPPORTED_CHAINS.indexOf(chainId) !== -1 && NOT_YET_UX_SUPPORTED_CHAIN_IDS.indexOf(chainId) === -1
+  // return !!chainId && SUPPORTED_CHAINS.indexOf(chainId) !== -1 && NOT_YET_UX_SUPPORTED_CHAIN_IDS.indexOf(chainId) === -1
+  // UPDATE: due to external fetch selecting currently supported network
+  // TODO: patch the supported netwok SDK library.
+  return chainId == ChainId.HARMONY
 }
 
 export function asSupportedChain(
diff --git a/src/pages/Swap/index.tsx b/src/pages/Swap/index.tsx
index 4bd46b4dbf3..00d776c71c4 100644
--- a/src/pages/Swap/index.tsx
+++ b/src/pages/Swap/index.tsx
@@ -147,7 +147,7 @@ export default function SwapPage({ className }: { className?: string }) {
       <PageWrapper>
         <Swap
           className={className}
-          chainId={supportedChainId ?? ChainId.MAINNET}
+          chainId={supportedChainId ?? ChainId.HARMONY}
           prefilledState={{
             [Field.INPUT]: { currencyId: loadedUrlParams?.[Field.INPUT]?.currencyId },
             [Field.OUTPUT]: { currencyId: loadedUrlParams?.[Field.OUTPUT]?.currencyId },