NFT media and metadata

nxyz aims to have the most extensive index of off-chain NFT media and metadata. NFT media is served from behind nxyz's CDN in the NFT media.URI field so that you don't have to fetch the media yourself. Cached NFT image CDN paths start with https://c.neevacdn.net/.... nxyz additionally fetches off-chain media such as logo images, collection social media handles, open sea verification status, and more.

We have crawled the web for >850mm NFTs, with new media fetched within seconds of a new token being minted on-chain.

Previews

Static preview images are also served from the CDN in .webp format in the previews field in three sizes: 200x200, 600x600, and 1200x1200.

NFT marketplace data

nxyz fetches the following off-chain data from NFT marketplaces:

• NFT collection floor prices: served in the nft.collection.floorPrice field with each NFT response item
• NFT sale information: served in the nft.purchase field with each NFT response item

Currently OpenSea is the only off-chain marketplace supported. Soon there will be expanded support for all major NFT marketplaces, as well as dedicated endpoints to retrieve NFT listings, bids, purchase history, and more across all marketplaces.

NFT media refreshing

When token media is refreshed (e.g., in the event of a token reveal), nxyz APIs typically serve the new media serving within seconds of the reveal. Should you find that a token's media is stale or missing, you may make a PUT request to the Token refresh endpoint to kick off a refresh of the media, which should be reflected within seconds. Alternatively, you may provide a method for your users to trigger token refreshes should they notice stale media being served from your app's frontend.

spam NFTs classification

nxyz operates a best-in-class proprietary spam classification model for NFTs, the result of which is stored in the isSpam field for all NFT objects returned from our APIs. The model takes into account a variety of on- and off-chain data sources and achieves >95% precision and >95% recall, better than any other known spam NFT detection model in the industry.

tokenStandard values

All NFT token objects have a tokenStandard field. Currently, for an NFT, this field may only take on the values of "ERC-721" or "ERC-1155", though it is currently defined as a string type in the OpenAPI specification to allow for scaling to alternative NFT token standards.