Semi-Fungible Token

Overview

A semi-fungible token is an asset that is interchangeable with equivalent units during part of its lifecycle but becomes unique or non-interchangeable after a defined event.

Examples include tickets that are fungible before use and individually marked after redemption, game items with editions, and tokens that gain unique history or attributes. For Semi-Fungible Token, its meaning should be derived from the specific rules that create, transfer, restrict, redeem, or account for the token.

Semi-fungibility is an application property rather than one universal token standard and can be implemented through multi-token, NFT, or custom contract designs. A token standard defines a baseline interface, but deployed code can add fees, rebasing, hooks, pausing, blacklists, or proxy upgrades. Integrations should inspect actual behavior.

Risks include inconsistent wallet support, metadata changes, double redemption, unclear supply, transfer restrictions, contract bugs, and marketplaces treating distinct states as equivalent. Governance and upgrades can change permissions or behavior after integration. monitoring should include contract events, role changes, official announcements, and market support.

Applications should record token ID, quantity, lifecycle state, redemption, metadata, uniqueness transition, transfer rules, and the standard used by the contract. Custody and treasury records should preserve acquisition cost, token identity, transaction evidence, conversion rate, and any claim, vesting, or redemption status. native, wrapped, and bridged versions should remain separate.

Readers can distinguish Semi-Fungible Token more clearly by comparing it with Fungible Token and Omnichain Fungible Token. For Semi-Fungible Token, this comparison explains the surrounding workflow without implying that the related concepts provide the same legal claim or technical behavior.