Dual Nature Token Pairs (404 Projects)
Cojoined ERC-20 and ERC-721
Goal
The main goal of this post is to list some of the -404 based projects that exist and provide some basic info and resources on what -404 projects are.
What are Dual Nature Token Pairs (-404 Projects)?
Dual Nature Token Pairs are projects typically ending in -404. They use an experimental token standard that combines ERC-20 (fungible tokens) and ERC-721 (non-fungible tokens), allowing tokens under this standard to be both fungible and non-fungible at the same time. This works by bonding an ERC-721 token to an ERC-20 token, where an ERC-20 token only represents an NFT when it is a whole token. Once it is broken down into fractions for trading as an ERC-20 token, the NFT is burnt. When two complementary fractions (e.g. 0.4 and 0.6) are combined to form a full token, a new NFT is minted. Typically, there are a set number of NFTs with associated metadata, and the NFTs that are burned and minted from the above actions are cycled in and out of this pool. So in effect, you are not minting a "new" NFT, you are drawing an existing one from a pool.
To date there have been a variety of unofficial standards developed, however there is an official ERC submission, aimed to standardize this pairing, which states the following:
"A fungible ERC-20 token contract and non-fungible ERC-721 token contract can be interlinked, allowing actions performed on one contract to be reflected on the other. This proposal defines how the relationship between the two token contracts can be queried. It also enables accounts to configure if ERC-721 mints and transfers are skipped during ERC-20 to ERC-721 synchronization."
Useful resources
Official ERC-404: https://eips.ethereum.org/EIPS/eip-7631, https://ethereum-magicians.org/t/erc-7631-dual-nature-token-pair/18796
Great video by the talented https://x.com/jenndefer
Seeing a lot of 404s on the timeline 
If ur wondering WTF is this, here’s a lil vid that I put out when they first came out.
Might be time to do an update as we’ve seen iterations on the standard w/ projects like @udw_gg & @asterixlabs
If ur wondering WTF is this, here’s a lil vid that I put out when they first came out.
Might be time to do an update as we’ve seen iterations on the standard w/ projects like @udw_gg & @asterixlabs
300
In depth guide to ERC-404: https://beincrypto.com/learn/erc-404-tokens-guide/
Coingecko ERC-404 guide: https://www.coingecko.com/learn/erc-404-token-standard
Coingecko ERC-404 token list: https://www.coingecko.com/en/categories/erc-404
Excellent twitter thread:
Cold Dives: A technical breakdown on DN 404, a hybrid ERC 20/721 token:
Incomplete List of Projects
Asterix
By far and away the leader in the space.
Amazing team (also leading the development of the official ERC-404 standard). Building rich partnerships. Amassing a large, multi-asset treasury. Integrating a DN404 launchpad and incubator powered by NFT staking. Running frequent puzzle based contests.
NFT Supply: 10,000
Token Supply: 10,000
Tokens per NFT: 1
Chain: Ethereum
Links: https://side.xyz/asterix
Farcaster (unofficial): https://warpcast.com/~/channel/asterix
Chiblings
Chiblings, the underdogs, Wassies best friends and the cutest 404 so far!
"an NFT is a combination of artwork and a cryptocurrency. A bastardised hybrid of the two, if you would." -loomdart
Link to @loomdarts vision tweet:
The Ultimate NFT Project:
Bit of a pre-ramble here but eh. There are currently very few NFT collections that are easy for NFT traders/flippers to compartmentalize/understand rarity distributions of. Now, why should we care about these guys? Well, because if the people…
Bit of a pre-ramble here but eh. There are currently very few NFT collections that are easy for NFT traders/flippers to compartmentalize/understand rarity distributions of. Now, why should we care about these guys? Well, because if the people…
NFT Supply: 6,986
Token Supply: 69,860
Tokens per NFT: 10
Chain: Ethereum
Farcaster: https://warpcast.com/~/channel/chiblings
Twitter Profile: https://x.com/realchiblings
CoinGecko: https://www.coingecko.com/en/nft/chiblings
NFT: https://blur.io/collection/chiblings
Trade on Uniswap. $Chib contract address: 0x7068263EDa099fB93BB3215c05e728c0b54b3137
Pandora
Pandora is the inaugural project to utilize ERC-404 tokens. It uniquely combines NFT boxes in various colors with the PANDORA token itself.
NFT Supply: 10,000
Token Supply: 10,000
Tokens per NFT: 1
Chain: Ethereum
Website: https://www.pandora.build/
CoinGecko: https://www.coingecko.com/en/coins/pandora
Magic Eden: https://magiceden.io/collections/ethereum/0x9e9fbde7c7a83c43913bddc8779158f1368f0413
Bonsai
The $DEGEN of the Lens ecosystem has opted for a DN404 token model. This token was airdropped to active LENS users, and is available for tipping on their social apps now. There will be 3 airdrops to users over the course of its first year.
NFT Supply: 10,000
Token Supply: 1,000,000,000
Tokens per NFT: 100,000
Chain: Polygon
https://www.coingecko.com/en/coins/bonsai-token
https://opensea.io/collection/bonsai-token
The Velocity Series, hosted by Bybit and Oracle Red Bull Racing, offers a cool web3 experience with digital art inspired by F1 racing. The Velocity Pass 2.0 gives exclusive access to NFT artwork, surprises, and prize raffles. You can get it in a Dutch auction or through airdrops if you're an OG Velocity Pass holder. Plus, the new DN-404 standard lets you own a fraction of a pass.
Website: https://www.bybit.com/en/promo/nft-events/velocity-pass-V2
Magic Eden: https://magiceden.io/collections/ethereum/0x494af9361f098de517e2a8591a566e642e23479d?activeTab=items
ERC20 Contract: https://etherscan.io/token/0x1c72523eecade307c9bffd03953ff91c5b80be09
Please comment any info I am missing: Exciting DN404 projects, details, figures, hot takes etc.