fix: Eth price fetch cache miss and use default fetch policy to remove extra...

fix: Eth price fetch cache miss and use default fetch policy to remove extra network requests (#6157)

src/graphql/data/TokenSpotPrice.ts

 import gql from 'graphql-tag'
 
 gql`
-  query TokenSpotPrice($chain: Chain!, $address: String) {
+  query TokenSpotPrice($chain: Chain!, $address: String = null) {
     token(chain: $chain, address: $address) {
       id
       address

src/hooks/useUSDPrice.ts

@@ -63,6 +63,7 @@ export function useUSDPrice(currencyAmount?: CurrencyAmount<Currency>): {
     skip: !chain || !isGqlSupportedChain(currency?.chainId),
     pollInterval: PollingInterval.Normal,
     notifyOnNetworkStatusChange: true,
+    fetchPolicy: 'cache-first',
   })
 
   // Use USDC price for chains not supported by backend yet