Caviar

Caviar is a fully on-chain NFT AMM that allows you to trade every NFT in a collection (from floors to superrares). You can also trade fractional amounts of each NFT too. It's designed with a heavy emphasis on composability, flexibility and usability. Docs are available here.

Getting started

yarn
forge install
forge test --gas-report

Example

forge install outdoteth/caviar transmissions11/solmate

pragma solidity ^0.8.17;

import "caviar/Caviar.sol";
import "caviar/Pair.sol";
import "solmate/tokens/ERC721.sol";

contract ExampleSwapper {
    Pair pair;
    ERC721 nft;

    constructor(address _nft, address _caviar) {
        nft = ERC721(_nft);
        pair = Pair(Caviar(_caviar).pairs(_nft, address(0), bytes32(0)));
    }

    function buyAndSell(uint256[] memory tokenIds, uint256 maxInput, uint256 minOutput) public payable {
        // buy nfts
        pair.nftBuy{value: maxInput}(tokenIds, maxInput);

        // sell nfts
        bytes32[][] memory proofs  = new bytes32[][](0);
        nft.setApprovalForAll(address(pair), true);
        pair.nftSell(tokenIds, minOutput, proofs);
    }
}

Contracts overview

Contract	LOC	Description
Caviar.sol	36	Factory contract that creates pairs and maintains a registry
Pair.sol	294	Pair contract that contains ERC20 AMM, NFT wrapping and NFT AMM logic
LpToken.sol	15	ERC20 token which represents liquidity ownership in pair contracts
SafeERC20Namer.sol	65	Helper contract that fetches the name and symbol of an ERC20/ERC721
CaviarEthRoyaltyRouter.sol	89	Router contract that swaps NFTs and pays royalties

Goerli: (demo app)