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Marketplace Royalty Standards (EIP-2981) Flashcards

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Read the first 7 Marketplace Royalty Standards (EIP-2981) flashcards as text

  1. What does the royaltyInfo function in EIP-2981 return?

    Answer: The receiver address and the royalty amount

    royaltyInfo(tokenId, salePrice) returns a tuple of the receiver address and the royaltyAmount to pay.

  2. Which parameters does royaltyInfo accept?

    Answer: _tokenId and _salePrice

    royaltyInfo takes the token ID and the sale price, then computes the royalty owed.

  3. EIP-2981 specifies royalty information but does NOT do what?

    Answer: Enforce or transfer the royalty payment

    EIP-2981 only signals the amount and receiver; actual payment enforcement is left to the marketplace.

  4. How is EIP-2981 support advertised to other contracts?

    Answer: Via ERC-165 supportsInterface

    Contracts implement ERC-165 so marketplaces can detect the IERC2981 interface ID.

  5. In what unit is royaltyAmount denominated?

    Answer: The same unit of exchange as _salePrice

    royaltyAmount is expressed in the same currency/unit as the salePrice passed in.

  6. A marketplace calls royaltyInfo with a salePrice of 0. What is the expected royaltyAmount?

    Answer: 0

    Royalty is calculated as a fraction of salePrice, so a zero salePrice yields a zero royalty.

  7. Why was EIP-2981 created?

    Answer: To provide a standard, marketplace-agnostic way to signal royalties

    It standardizes royalty signaling so any compliant marketplace can read the same data.