swap string literal for zeroAddress var

Author: websurferdoteth

packages/nextjs/app/listing/new/page.tsx

@@ -378,14 +378,14 @@ const NewListingPageInner = () => {
         const pt = (item.paymentToken as string)?.toLowerCase();
         if (
           pt &&
-          pt !== "0x0000000000000000000000000000000000000000" &&
+          pt !== zeroAddress &&
           Object.values(KNOWN_TOKENS)
             .map(v => v.toLowerCase())
             .includes(pt)
         ) {
           const tokenKey = Object.entries(KNOWN_TOKENS).find(([, a]) => a.toLowerCase() === pt)?.[0];
           if (tokenKey) setCurrency(tokenKey);
-        } else if (pt && pt !== "0x0000000000000000000000000000000000000000") {
+        } else if (pt && pt !== zeroAddress) {
           // Custom token
           setCurrency("TOKEN");
           setTokenAddress(pt);

packages/nextjs/components/marketplace/ListingCard.tsx

@@ -1,7 +1,7 @@
 import { useMemo } from "react";
 import Image from "next/image";
 import Link from "next/link";
-import { Hex, decodeAbiParameters, formatUnits } from "viem";
+import { Hex, decodeAbiParameters, formatUnits, zeroAddress } from "viem";
 import { useScaffoldReadContract } from "~~/hooks/scaffold-eth/useScaffoldReadContract";
 import { resolveIpfsUrl } from "~~/services/ipfs/fetch";
 
@@ -50,7 +50,7 @@ export const ListingCard = ({
         [{ type: "address" }, { type: "uint256" }],
         listingDataBytes as Hex,
       );
-      const isEth = String(paymentToken).toLowerCase() === "0x0000000000000000000000000000000000000000";
+      const isEth = String(paymentToken).toLowerCase() === zeroAddress;
       return {
         priceWei: price as bigint,
         tokenSymbol: isEth ? "ETH" : tokenSymbolProp || "TOKEN",

packages/nextjs/components/marketplace/PayButton.tsx

@@ -70,12 +70,12 @@ export const PayButton = ({ listingId, priceWei, paymentToken, disabled, listing
 
   const isErc20 = useMemo(() => {
     const pt = (paymentToken || "").toLowerCase();
-    return !!pt && pt !== zeroAddress.toLowerCase();
+    return !!pt && pt !== zeroAddress;
   }, [paymentToken]);
 
-  const ownerAddress = (address || "0x0000000000000000000000000000000000000000") as `0x${string}`;
-  const tokenAddress = (paymentToken || "0x0000000000000000000000000000000000000000") as `0x${string}`;
-  const spenderAddress = (listingTypeSpenderLower || "0x0000000000000000000000000000000000000000") as `0x${string}`;
+  const ownerAddress = (address || zeroAddress) as `0x${string}`;
+  const tokenAddress = (paymentToken || zeroAddress) as `0x${string}`;
+  const spenderAddress = (listingTypeSpenderLower || zeroAddress) as `0x${string}`;
 
   const { data: allowanceData } = useReadContract({
     address: tokenAddress,