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

The Seaport conduit acts as a shared transfer proxy, letting users set one approval that the marketplace uses to move their tokens during fulfillment.

Question 2

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

Accepted Answer

ERC-2981

Answer

ERC-2981 defines the royaltyInfo function that marketplaces query to determine the royalty recipient and amount.

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

Without an approval granted to the marketplace contract, it lacks permission to transfer the token to the buyer.

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

Lazy minting stores a signed voucher off-chain and only executes the actual mint transaction when the item is purchased.

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

OpenSea's API is multichain, so the chain parameter is required to scope listing queries to the correct network.

NFT Development Practice Test

NFT Development Practice Test

NFT Marketplace Integration 2