What Is NFT in Crypto?

An NFT (non-fungible token) is a token whose each unit is unique and not interchangeable. Ethereum's ERC-721 standard defines the canonical NFT contract; ERC-1155 allows fungible and non-fungible tokens in a single contract. NFTs are used for digital art, collectibles, in-game items, tokenized event tickets, and domain names (ENS, SNS). The market peaked in 2021-2022; activity has since settled at a lower equilibrium.

Also known as: non-fungible token, erc-721

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How NFTs work

A minimal ERC-721 contract tracks:

  • Ownership mapping — token ID → owner address.
  • Metadata URI — each token has a URI pointing to off-chain metadata (image, attributes, description). Typically hosted on IPFS or Arweave.
  • Transfer functions — standard transferFrom, safeTransferFrom, approval mechanisms.

Minting is the creation step: the contract increments its ID counter, assigns ownership to the minter, and emits a Transfer event. Secondary trading happens on marketplaces (OpenSea, Blur, Magic Eden, Tensor) that facilitate escrowed swaps of NFT for payment asset (typically ETH or SOL).

Major NFT categories

  • PFPs (profile pictures) — Bored Apes, CryptoPunks, Pudgy Penguins, DeGods. Community-driven collections; floor prices driven by cultural momentum.
  • Generative art — Art Blocks, Fidenzas, QQL. Algorithm-generated art, often minted in fixed-count editions.
  • Photography — Justin Aversano’s Twin Flames, Drifter Shoots. Photographer-led editions.
  • Gaming items — Axie Infinity, Gods Unchained, Illuvium. In-game assets tokenized for trading.
  • Music — Sound.xyz, Catalog. Artist drops with revenue sharing.
  • Domain names — ENS (.eth), SNS (.sol), Unstoppable Domains. Tokenized namespaces.
  • Event tickets and memberships — experimental; most adoption is niche.

Market dynamics

NFT trading volume peaked in Q4 2021 at $25B monthly. Current 2025 volume is 10-20% of that peak, concentrated in:

  • A handful of blue-chip collections (Punks, Apes) holding value as collectibles.
  • Ordinals on Bitcoin (inscriptions and BRC-20), which revived collector interest in 2023-2024.
  • Memecoin-adjacent NFT series on Solana that pump alongside the broader Solana memecoin cycle.

Risks and considerations

  • Floor-price volatility — NFT collections often see 90%+ drawdowns from peak. Entire “blue chip” collections have dropped from 20 ETH to 2 ETH floors.
  • Illiquidity — unlike fungible tokens, NFTs can sit without a bid for weeks or months. Exit prices can be far below nominal floor.
  • Wash trading — significant fraction of reported NFT volume is self-dealing to game reward programs (Blur) or inflate collection stats.
  • Royalty enforcement — creator royalties (5-10% of secondary sales) are widely circumvented on modern marketplaces (Blur optional, Sudoswap bypass).
  • Smart-contract and metadata risk — hacks have drained royalty contracts; metadata hosted on non-IPFS servers can disappear, leaving the NFT with no associated image.

For collectors, the practical posture: treat NFTs as high-variance collectible exposure. Only buy what you’d hold even if floor dropped 70%. Store NFTs in hardware-wallet-secured addresses, not hot wallets used for trading. And remember that NFT “liquidity” is nothing like stock market liquidity — plan to hold longer than feels convenient.

Related terms

Token A token is a digital asset issued on an existing blockchain, represented by a smart contract. Smart Contract A smart contract is code deployed to a blockchain that runs when invoked and whose execution is guaranteed by the network's consensus. Wallet A crypto wallet is a tool that stores private keys and signs transactions on behalf of a user. Rug Pull A rug pull is a crypto scam where the token's deployer drains the liquidity pool and disappears, leaving holders with a worthless token.