Waterfall

Waterfall is an on-chain NFT (ERC-721) trading and pricing protocol. The mechanism intends to provide price discovery and instant price querying for NFTs that are listed on the protocol (i.e. it does not appraise any NFTs that isn't being sold).

When an NFT is listed on the protocol, it fractionalizes the NFT into a specified number of chips: ERC-1155 tokens that represent predictions on the NFT's future valuation. They may exchange hands however, but the main invariant the mechanism maintains is that all chips must be listed at all times. In other words, each chip has a price that anyone can match to acquire it. This remains true until somebody decides to buyout the NFT, which pays out each of the chip owners and transfers the NFT out of the protocol to the buyer.