I'm building an NFT marketplace. I have a view function that returns the NFTs of a user. However, this function requires a transaction and costs gas that the user must pay.

Here is the related part of the MarketContract code:

contract Market is ReentrancyGuard {
    using Counters for Counters.Counter;
    Counters.Counter private _listingCount;

    mapping(uint256 => Listing) public marketListings;

    struct Listing {
        uint256 listingId;
        address nftContractAdd;
        uint256 tokenId;
        address ownerAdd;
        uint256 price;

    function getItemsOf (address wallet) public view returns (Listing[] memory) {
        uint resultCount = 0;
        for (uint i = 0; i < _listingCount.current(); i++) {
            if (marketListings[i].ownerAdd == address(wallet)) {

        uint itemCount = 0;
        Listing[] memory items = new Listing[](resultCount);
        for (uint256 i = 0; i <= _listingCount.current(); i++) { 
            if(marketListings[i].ownerAdd == address(wallet)) {
                items[itemCount] = marketListings[i];

        return items;

And, here is my frontend code:

async getListedItemsOfUser({ }, payload) {
        const { walletAddress } = payload

        const web3Modal = new Web3Modal();
        const connection = await web3Modal.connect();
        const provider = new ethers.providers.Web3Provider(connection);
        const signer = provider.getSigner();

        const marketContract = new ethers.Contract(

        try {
            const res = await marketContract.getListedItemsOf(walletAddress);
            console.log("listed items", res)
        } catch (err) {

Why does this function cost gas?

Here the ABI of all the contract code: GIST

  • How are you measuring the gas cost? If called off-chain it shouldn't charge anything.
    – Ismael
    Apr 25, 2022 at 13:51
  • I couldn't get what you mean by 'measuring'? When the frontend method works, Metamask opens and the user must confirm a transaction and pay some gas. But this is only a view function? @Ismael
    – anileates
    Apr 25, 2022 at 13:57
  • It shouldn't ask for confirmation. What's the abi you are using? Can you attach it to the question? For some reason the frontend code creates a transaction, and it shouldn't do it for view functions.
    – Ismael
    Apr 25, 2022 at 17:39
  • Here is the abi: gist @Ismael
    – anileates
    Apr 25, 2022 at 18:31

1 Answer 1


You are calling getListedItemsOf method from your frontend. Shouldn't you be calling getItemsOf like you have posted in your question?

These two methdos have different stateMutability in the provided ABI.

  • Oh, you are right! didn't notice that. Thank you so much!
    – anileates
    Apr 26, 2022 at 9:27

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