> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# NFT Royalty Enforcement (ERC-2981)

> Implement ERC-2981 royalty standard to inform marketplaces of creator royalties.

# NFT Royalty Enforcement (ERC-2981)

Implement ERC-2981 royalty standard to inform marketplaces of creator royalties.

Implement ERC-2981 royalty standard to inform marketplaces of creator royalties.

## Explanation

ERC-2981 is the standard for NFT royalties. Marketplaces query royaltyInfo to determine how much to pay the creator on secondary sales. Bps (basis points) — 250 = 2.5%. supportsInterface must declare ERC-2981 support.

## Code

```solidity theme={null}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";

contract RoyaltyNFT is ERC721, IERC2981 {
    address public royaltyReceiver;
    uint96 public royaltyFeeBps = 250; // 2.5%

    constructor() ERC721("RoyaltyNFT", "RNFT") {
        royaltyReceiver = msg.sender;
    }

    function royaltyInfo(uint256 /* tokenId */, uint256 salePrice)
        external
        view
        override
        returns (address receiver, uint256 royaltyAmount)
    {
        receiver = royaltyReceiver;
        royaltyAmount = (salePrice * royaltyFeeBps) / 10000;
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, IERC165)
        returns (bool)
    {
        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
    }
}
```

***

**Canonical knowledge ID:** `code-example:nft-royalty-erc-2981`