I’m having some trouble understanding a few things some basic NFT attributes through NFT Api. I’m experimenting with getNFTLowestPrice and getNFTOwners NFT API data.
So starting with the most simple:
1) What’s the currency unit of the price’ field? it seems to often comes in the realm of quadrillions – is the unit ‘wei’? An example response below:
{
"transaction_hash": "0x057Ec652A4F150f7FF94f089A38008f49a0DF88e",
"transaction_index": "string",
"token_ids": ["15", "54"],
"seller_address": "0x057Ec652A4F150f7FF94f089A38008f49a0DF88e",
"buyer_address": "0x057Ec652A4F150f7FF94f089A38008f49a0DF88e",
"marketplace_address": "0x057Ec652A4F150f7FF94f089A38008f49a0DF88e",
"price": "1000000000000000", <------------< one quadrillion of wei?
"block_timestamp": "2021-06-04T16:00:15",
"block_number": "13680123",
"block_hash": "0x4a7c916ca4a970358b9df90051008f729685ff05e9724a9dddba32630c37cb96"
}
2) I’ve also encounter some specific NFTs where I get an error while getting the price but can’t understand where the error comes like in the image below:
Regarding the getNFTOwners requests, here’s an example of a response querying an specific NFT minted by my flatmate on a marketplace named Foundation:
3) It’s returning thousands of results. I know that this NFT wasn’t sold, and that my flatmate didn’t mint these many multiples (it’s a single edition). I can’t even figure what’s the current owner wallet from this response. I’m very confused. In regards to this specific case, and going back to the getNFTsLowestPrice, this NFTs retrieves 35000000000000000. As I said it wasn’t sold, so is it correct to assume that the price is showing the original minting cost? And if so, why do some NFTs retrieve 0 as a price?
Which leads me to a few other questions:
4) when someone mints an NFT with multiples (let’s say 1000 multiples) is the NFT token address always the same? What’s the role of the field token_id . I’ve also noticed that getNFTsLowestPrice retrieves token_ids as an array containing two token_ids!
5) Is there a pattern/way to know the type of file the NFT links to (is it a, jpg, png, 3d obj or a .mp4)? I know I can parse the metadata field and know to which file the uri points (and then do something with it), however not only the image might point to a uri without a format sufix, and actually point to a video file instead of an image. I guess the metadata has infinite variations from creator to creator, from minting platform to minting platform, so I’m unsure if there’s any off-the-shelf solution for this.
7) finally the last one, and possibly the most complex – when someone creates a generative/mutable NFTs… is it the case that the creator creates a smart-contract with instruction/variables to change the NFT, and also creates transactionable NFTs that look at that smart contract to change their shape?
I know it’s a lot but even if you only know something about to one of the topics it would help me making some sense of this. Many thanks in advance for your time!
Best! 