diff --git a/src/modules/utils/index.ts b/src/modules/utils/index.ts
index 9a65696..aa9d737 100644
--- a/src/modules/utils/index.ts
+++ b/src/modules/utils/index.ts
@@ -56,7 +56,7 @@ export class UtilsModule extends BaseModule {
 
     // Check on-chain if user owns NFT by calling contract with web3
     let balance = BigInt(0);
-    const provider = new ethers.JsonRpcProvider();
+    const provider = new ethers.JsonRpcProvider(rpcURL);
     if (contractType === 'ERC721') {
       const contract = new ethers.Contract(contractAddress, ERC721ContractABI, provider);
       balance = BigInt(await contract.balanceOf(walletAddress));
diff --git a/src/modules/utils/ownershipABIs.ts b/src/modules/utils/ownershipABIs.ts
index ed4ee7d..da24ffe 100644
--- a/src/modules/utils/ownershipABIs.ts
+++ b/src/modules/utils/ownershipABIs.ts
@@ -1,6 +1,6 @@
 export const ERC721ContractABI = [
-    "function balanceOf(address) view returns (uint)",
+    "function balanceOf(address owner) view returns (uint balance)",
 ]
 export const ERC1155ContractABI = [
-    "function balanceOf(address, id) view returns (uint)",
+    "function balanceOf(address owner, uint id) view returns (uint balance)",
 ]