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What Is a “Royalty” Mechanism in an ERC-721 Contract?

A royalty mechanism allows the original creator of an NFT to automatically receive a percentage of the sale price every time the NFT is resold on a secondary market. This is often implemented via a standardized extension (like EIP-2981) that marketplaces can choose to honor.

It provides a continuous revenue stream for artists and creators beyond the initial sale.

What Are the Key Differences between ERC-721 and the Newer ERC-1155 Standard?
Can a Non-Fungible Token (NFT) Be Fractionalized, and What Standard Governs This?
How Does the ERC-721 Standard Differ Fundamentally from ERC-20?
How Does ERC-1155 Improve Gas Efficiency over ERC-20 and ERC-721?