> For the complete documentation index, see [llms.txt](https://asterix.gitbook.io/asterix/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://asterix.gitbook.io/asterix/faq.md).
# FAQ
**Why does it matter if I sell as an NFT(ERC721) or as a Token(ERC20)?**
Transacting your Anomalies NFT and $ASTX are the same thing, the matter of consideration is whether the NFT with a certain rarity you wish to keep is locked and not burned.
Holders are advised to separate tokens meant for trading and NFTs meant for keeping via dedicated wallets.
Metadata/Rarity will not be lost when traded on a NFT marketplace such as Blur or Opensea. In other words trading on such platforms means you won't accidentally lose the NFT that you wish to keep.
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**Why is the price of a NFT and $ASTX not the same?**
Note that price differences between platforms are due to various factors such as, but not limited to, depth of liquidity, minimum transaction value which is 1 $ASTX for all NFT transactions and the differing platform fees. NFTs may also be prices higher due to rarity traits.
**How does DN404 optimize gas?**
DN404 optimizes gas via a method called 'Storage Packing', which packs multiple variables into the same storage slot.
**How do I make sure I don't sell a specific NFT if I have multiple $ASTX?**
To prevent the Anomalies you wish to keep from being accidently sold when you have multiple tokens, it is best to move them to a separate wallet by transferring them to a new wallet as a ERC721 token as opposed to ERC20.
**Why is the floor price of an Anomalies NFT the price of 1 $ASTX?**
The floor price of an Asterix Anomalies NFT can be considered to be the price of 1 $ASTX because you can instantly sell the Anomalies NFT via a DEX as an $ASTX(ERC20) token.
**Has DN404 been submitted for EIP approval?**
Yes.
**What happens to the NFT if you make transfers via ERC20?**
Any movement of the ERC-20 tokens triggers the mint/burn of NFTs. If you have 1 $ASTX and you send 0.5 $ASTX elsewhere, your NFT is burned. If you later acquire another 0.5 $ASTX, a new NFT will be minted to your wallet.
At the same time, if 1 ERC20 token is transferred to another wallet, the NFT tied to that ERC20 token will get burned and re-minted. In order to ensure the NFT is preserved, conduct transfers via ERC721.
**Which NFT gets burned and which NFT gets minted?**
NFTs are burned from your wallet last-in-first-out. NFTs are minted according to the specific DN404 contract logic.