NFT Marketplace Integration 2

Question 1

When integrating with OpenSea's Seaport protocol, what is the primary purpose of the 'conduit' contract?

Accepted Answer

To approve and transfer tokens on behalf of users via a shared allowance

Answer

To store NFT metadata on-chain

Answer

To calculate gas fees for listings

Answer

To mint new NFT collections

Question 2

Which standard interface should a contract implement so marketplaces can correctly distribute creator royalties?

Accepted Answer

ERC-2981

Answer

ERC-20

Answer

ERC-165 only

Answer

ERC-1155 metadata URI

Question 3

A developer lists an NFT for sale but the marketplace cannot transfer it on completion. What is the most likely cause?

Accepted Answer

The marketplace operator was never granted approval via setApprovalForAll or approve

Answer

The NFT has no name

Answer

The buyer used the wrong wallet color

Answer

The token ID is even instead of odd

Question 4

What does a 'lazy minting' integration allow a marketplace to do?

Accepted Answer

Defer the on-chain mint until the first sale, with the buyer paying gas

Answer

Mint thousands of NFTs instantly for free

Answer

Skip royalty payments entirely

Answer

Bypass wallet signatures

Question 5

When fetching a collection's listings via the OpenSea API, which value is essential to filter results to a specific blockchain?

Accepted Answer

The chain identifier (e.g., ethereum, matic)

Answer

The user's email

Answer

The browser user-agent

Answer

The NFT's file size

Question 6

In a marketplace order, what role does the 'salt' value typically play?

Accepted Answer

It ensures order hash uniqueness to prevent collisions and replay of identical orders

Answer

It sets the sale price

Answer

It encrypts the NFT image

Answer

It identifies the buyer's country

Question 7

Why might a marketplace integration prefer EIP-712 typed-data signatures over raw message signing for listings?

Accepted Answer

It presents human-readable structured data in the wallet, improving security and UX

Answer

It makes transactions free

Answer

It removes the need for a private key

Answer

It compresses the NFT metadata