NFT Gas Optimization for NFTs

Question 1

Which ERC standard is more gas-efficient when minting large quantities of fungible or semi-fungible tokens?

Accepted Answer

ERC-1155

Answer

ERC-1155 allows batch minting of multiple token types in a single transaction, significantly reducing per-token gas costs compared to ERC-721.

Question 2

What is 'lazy minting' in NFT development?

Accepted Answer

Deferring on-chain minting until the first purchase or claim

Answer

Lazy minting defers the actual on-chain transaction until a buyer claims the NFT, so the creator avoids upfront gas costs.

Question 3

Which storage approach costs the least gas for associating large data with an NFT?

Accepted Answer

Storing only a content-addressed URI pointing to off-chain storage

Answer

Storing only a URI (e.g., pointing to IPFS) on-chain is far cheaper than storing raw data in contract storage slots.

Question 4

What does the ERC-721A standard optimize compared to standard ERC-721?

Accepted Answer

Lowering gas costs for batch minting sequential token IDs

Answer

ERC-721A by Azuki writes batch ownership data once instead of per-token, dramatically cutting gas for minting multiple tokens in one transaction.

Question 5

Which Solidity technique reduces gas costs by skipping overflow/underflow checks for a counter known to be safe?

Accepted Answer

using unchecked {} blocks

Answer

Wrapping arithmetic in `unchecked {}` skips Solidity 0.8's built-in overflow checks, saving gas when the developer can guarantee no overflow.

NFT Development Practice Test