FREE NFT Development Marketplace Integration Questions and Answers

Question 1

A user wants to list a single, specific NFT for sale on a decentralized marketplace.
To grant the marketplace the most precise and secure permission to transfer only that specific NFT upon a successful sale, which function must the user call on the NFT contract?

Accepted Answer

approve(marketplaceAddress, tokenId)

Answer

setApprovalForAll(marketplaceAddress, true)

Answer

transferFrom(myAddress, marketplaceAddress, tokenId)

Answer

safeTransferFrom(myAddress, marketplaceAddress, tokenId)

Question 2

A development team wants to programmatically receive a percentage of the sale price each time their NFTs are resold on compliant secondary marketplaces. Which EIP provides a standardized interface for contracts to signal and retrieve this royalty information?

Accepted Answer

EIP-2981

Answer

EIP-721

Answer

EIP-1155

Answer

EIP-165

Question 3

After deploying a new ERC-721 contract, a developer notices that marketplaces are not displaying the collection's overall name, description, or logo, although individual NFTs and their traits appear correctly. Which of the following is the most likely missing feature in the contract?

Accepted Answer

A `contractURI()` function that points to collection-level metadata.

Answer

A `tokenURI` function returning invalid JSON.

Answer

An implementation of the EIP-2981 royalty standard.

Answer

The ERC721Enumerable extension.

Question 4

An NFT marketplace enables gas-less listings by having users sign an off-chain message that details the sale terms (e.g., NFT, price, deadline). A buyer can then submit this signed message to the marketplace's smart contract to execute the trade. What is this common integration pattern called?

Accepted Answer

Off-chain order book with on-chain settlement

Answer

On-chain lazy minting

Answer

State channel negotiation

Answer

Atomic swap delegation

Question 5

For a marketplace to programmatically discover if an NFT contract supports optional features like EIP-2981 (Royalties) or ERC721Enumerable, which standard EIP-165 function must the contract implement?

Accepted Answer

supportsInterface(bytes4 interfaceId)

Answer

hasFeature(bytes4 featureId)

Answer

getInterface(bytes4 interfaceId)

Answer

isStandard(bytes4 standardId)

Question 6

Which of the following represents the most significant security risk to a user who calls `setApprovalForAll(marketplaceAddress, true)` on their NFT contract?

Accepted Answer

A vulnerability in the marketplace contract could allow an attacker to drain all of the user's approved NFTs from that collection.

Answer

The gas cost for the transaction will be unpredictably high.

Answer

The marketplace will be able to mint new tokens on the user's behalf.

Answer

The user will no longer be able to burn their own NFTs.