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ERC20-Pricing Invariants

  • Version will never be blank
  • Version will never change.
  • Any user can get the contract’s version
  • It will always return a price, even if it is 0
  • Prices can be set for any valid address, regardless of the type(EOA or contract)
  • A non-owner address can never set a price
  • Any user can get the token’s price
  • Any user can retrieve the price mapping
  • Setting a price will always emit TokenPrice event

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ERC721-Pricing Invariants

Note: Not implemented yet
  • Version will never be blank
  • Version will never change.
  • Any user can get the contract’s version
  • It will always return a price, even if it is 0
  • Prices cannot be for non ERC721 compliant NFT’s
  • Trying to set a price for non ERC721 compliant NFT’s always reverts with NotAnNFTContract
  • Trying to set a price for non ERC721 compliant NFT collections always reverts with NotAnNFTContract
  • A non-owner address can never set a price
  • Any user can get a token’s price
  • Any user can get a collection’s price
  • Any user can retrieve the nft price mapping
  • Any user can retrieve the collection price mapping
  • When using an ERC721 compliant NFT’s address, setting an NFT price always emits SingleTokenPrice event with the correct address, id, and price.
  • When using an ERC721 compliant NFT’s address, setting an NFT collection price always emits CollectionPrice event with the correct address and price.
  • When a specific tokenId price is set and a collection price is set and that specific tokenId’s price is retrieved, it always returns the specific tokenId’s price and not the collection’s price.
  • When no specific tokenId price is set and a collection price is set, it always retrieves the collection price.
  • When no specific tokenId price is set and no collection price is set, it always returns 0.
  • When a specific tokenId prices are set and a collection price is set, it always returns the specific tokenId’s price.
Transfer FeeProtocol Invariants