diff --git a/src/components/CurrencyLogo/index.tsx b/src/components/CurrencyLogo/index.tsx
index 7c3154ece75..3c1ba886456 100644
--- a/src/components/CurrencyLogo/index.tsx
+++ b/src/components/CurrencyLogo/index.tsx
@@ -9,7 +9,7 @@ import useHttpLocations from '../../hooks/useHttpLocations'
 import { WrappedTokenInfo } from '../../state/lists/wrappedTokenInfo'
 import Logo from '../Logo'
 
-type Network = 'ethereum' | 'arbitrum' | 'optimism'
+type Network = 'ethereum' | 'arbitrum' | 'optimism' | 'polygon' | 'mumbai'
 
 function chainIdToNetworkName(networkId: SupportedChainId): Network {
   switch (networkId) {
@@ -19,6 +19,10 @@ function chainIdToNetworkName(networkId: SupportedChainId): Network {
       return 'arbitrum'
     case SupportedChainId.OPTIMISM:
       return 'optimism'
+    case SupportedChainId.POLYGON_MUMBAI:
+      return 'mumbai'
+    case SupportedChainId.POLYGON:
+      return 'polygon'
     default:
       return 'ethereum'
   }
diff --git a/src/components/DowntimeWarning/index.tsx b/src/components/DowntimeWarning/index.tsx
index 35401bcfb02..2668e183fb3 100644
--- a/src/components/DowntimeWarning/index.tsx
+++ b/src/components/DowntimeWarning/index.tsx
@@ -50,6 +50,19 @@ export default function DowntimeWarning() {
             </Trans>
           </div>
         )
+      case SupportedChainId.POLYGON_MUMBAI:
+        return (
+          <div>
+            <Trans>
+              Polygon Mumbai is in Beta and may experience downtime. Polygon expects planned downtime to upgrade the
+              network in the near future. During downtime, your position will not earn fees and you will be unable to
+              remove liquidity.{' '}
+              <ReadMoreLink href="https://help.uniswap.org/en/articles/5406082-what-happens-if-the-optimistic-ethereum-network-experiences-downtime">
+                Read more.
+              </ReadMoreLink>
+            </Trans>
+          </div>
+        )
       case SupportedChainId.ARBITRUM_ONE:
       case SupportedChainId.ARBITRUM_RINKEBY:
         return (
diff --git a/src/constants/addresses.ts b/src/constants/addresses.ts
index 6f8ab67c7e5..217c5682503 100644
--- a/src/constants/addresses.ts
+++ b/src/constants/addresses.ts
@@ -114,6 +114,7 @@ export const SWAP_ROUTER_ADDRESSES: AddressMap = constructSameAddressMap('0xE592
   SupportedChainId.OPTIMISTIC_KOVAN,
   SupportedChainId.ARBITRUM_ONE,
   SupportedChainId.ARBITRUM_RINKEBY,
+  SupportedChainId.POLYGON_MUMBAI,
 ])
 export const LIMIT_ORDER_MANAGER_ADDRESSES: AddressMap = {
   [SupportedChainId.KOVAN]: '0x66E15bb53c9C5fB1B9Aa19D84920A3965cEad8a7',
@@ -123,6 +124,7 @@ export const LIMIT_ORDER_MANAGER_ADDRESSES: AddressMap = {
   [SupportedChainId.ARBITRUM_ONE]: '0x02C282F60FB2f3299458c2B85EB7E303b25fc6F0',
   [SupportedChainId.MAINNET]: '0xD1fDF0144be118C30a53E1d08Cc1E61d600E508e',
   [SupportedChainId.POLYGON]: '0xD1fDF0144be118C30a53E1d08Cc1E61d600E508e',
+  [SupportedChainId.POLYGON_MUMBAI]: '0xfB6dC01d0fEB05eB03e221192EEDfBB024D8808D',
 }
 export const KROM_TOKEN_ADDRESSES: AddressMap = {
   [SupportedChainId.KOVAN]: '0x4cEbC301Cd0E8AD64dE6B19576de7dd0B0140a1f',
@@ -132,6 +134,7 @@ export const KROM_TOKEN_ADDRESSES: AddressMap = {
   [SupportedChainId.ARBITRUM_ONE]: '0x55fF62567f09906A85183b866dF84bf599a4bf70',
   [SupportedChainId.MAINNET]: '0x3af33bef05c2dcb3c7288b77fe1c8d2aeba4d789',
   [SupportedChainId.POLYGON]: '0x14Af1F2f02DCcB1e43402339099A05a5E363b83c',
+  [SupportedChainId.POLYGON_MUMBAI]: '0x5dC282A4ACdB02b6e682F78Fe54EADFF9f55be09',
 }
 export const UNISWAP_UTILS_ADDRESSES: AddressMap = {
   [SupportedChainId.KOVAN]: '0x9E1E4f041877f1aB604E5B109Cf699545e20E4bC',
@@ -141,7 +144,8 @@ export const KROMATIKA_ROUTER_ADDRESSES: AddressMap = {
   [SupportedChainId.POLYGON]: '0xCe7cbDA67DE0BFdBBBAEA0DB94434a722A353CF4',
 }
 export const KROMATIKA_METASWAP_ADDRESSES: AddressMap = {
-  [SupportedChainId.POLYGON]: '0xE10F5F77CF90c99976BceE524Fbf88504A2e6616',
+  [SupportedChainId.POLYGON]: '0x6afD834f6e3D5ad5A83E7838ca45F3DBDe3E323d',
+  [SupportedChainId.POLYGON_MUMBAI]: '0xC266AA95553247194BDDa9dc1a364Bb35Dcd2d3E',
 }
 export const BICONOMY_DAPP_API: AddressMap = {
   [SupportedChainId.POLYGON]: 'lD1x8FLPD.45318b65-8ab0-45c7-b59c-2f73137fb751',
diff --git a/src/constants/tokens.ts b/src/constants/tokens.ts
index 88dcb16ce43..8d6bc092da5 100644
--- a/src/constants/tokens.ts
+++ b/src/constants/tokens.ts
@@ -214,6 +214,13 @@ export const KROM: { [chainId: number]: Token } = {
     'KROM',
     'Kromatika'
   ),
+  [SupportedChainId.POLYGON_MUMBAI]: new Token(
+    SupportedChainId.POLYGON_MUMBAI,
+    KROM_TOKEN_ADDRESSES[SupportedChainId.POLYGON_MUMBAI],
+    18,
+    'KROM',
+    'Kromatika'
+  ),
 }
 
 export const WETH: { [chainId: number]: Token } = {