Version: Next

NFT Catalog

The NFT Catalog is an on chain registry listing NFT collections that exists on Flow which adhere to the NFT metadata standard. This empowers dApp developers to easily build on top of and discover interoperable NFT collections on Flow.

Live Site

Checkout the catalog site to submit your NFT collection both on testnet and mainnet.

Contract Addresses

NFTCatalog.cdc: This contract contains the NFT Catalog

Network	Address
Mainnet	0x49a7cda3a1eecc29
Testnet	0x324c34e1c517e4db

NFTRetrieval.cdc: This contract contains helper functions to make it easier to discover NFTs within accounts and from the catalog

Network	Address
Mainnet	0x49a7cda3a1eecc29
Testnet	0x324c34e1c517e4db

Submitting a Collection to the NFT Catalog

Visit here
Enter the address containing the NFT contract which contains the collection and select the contract.

Enter the storage path where the NFTs are stored and enter an address that holds a sample NFT or log in if you have access to an account that owns the NFT.
The application will verify that your NFT collection implements the required Metadata views.
1. The required metadata views include…
  1. NFT Display
    1. How to display an individual NFT part of the collection
  2. External URL
    1. A website for the NFT collection
  3. Collection Data
    1. Information needed to store and retrieve an NFT
  4. Collection Display
    1. How to display information about the NFT collection the NFT belongs to
  5. Royalties
    1. Any royalties that should be accounted for during marketplace transactions
2. You can find sample implementations of all these views in this example NFT contract.
3. If you are not implementing a view, the app will communicate this and you can update your NFT contract and try resubmitting.
Submit proposal transaction to the NFT catalog by entering a unique url safe identifier for the collection and a message including any additional context (like contact information).

Once submitted you can view all proposals here to track the review of your NFT.

If you would like to make a proposal manually, you may submit the following transaction with all parameters filled in: https://github.com/dapperlabs/nft-catalog/blob/main/cadence/transactions/propose_nft_to_catalog.cdc

Proposals should be reviewed and approved within a few days. Reasons for a proposal being rejected may include:

Providing duplicate path or name information of an existing collection on the catalog
Providing a not url safe or inaccurate name as the identifier

Using the Catalog (For marketplaces and other NFT applications)

All of the below examples use the catalog in mainnet, you may replace the imports to the testnet address when using the testnet network.

Example 1 - Retrieve all NFT collections on the catalog

import NFTCatalog from 0x49a7cda3a1eecc29
/*
	The catalog is returned as a `String: NFTCatalogMetadata`
	The key string is intended to be a unique identifier for a specific collection.
	The NFTCatalogMetadata contains collection-level views corresponding to each
	collection identifier.
*/
pub fun main(): {String : NFTCatalog.NFTCatalogMetadata} {
    return NFTCatalog.getCatalog()
}

Example 2 - Retrieve all collection names in the catalog

import NFTCatalog from 0x49a7cda3a1eecc29
pub fun main(): [String] {
		let catalog: {String : NFTCatalog.NFTCatalogMetadata} = NFTCatalog.getCatalog()
		let catalogNames: [String] = []
		for collectionIdentifier in catalog.keys {
			catalogNames.append(catalog[collectionIdentifier]!.collectionDisplay.name)
    }
    return catalogNames
}

Example 3 - Retrieve NFT collections and counts owned by an account

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub fun main(ownerAddress: Address) : {String : Number} {
    let catalog = NFTCatalog.getCatalog()
    let account = getAuthAccount(ownerAddress)
    let items : {String : Number} = {}
    for key in catalog.keys {
        let value = catalog[key]!
        let tempPathStr = "catalog".concat(key)
        let tempPublicPath = PublicPath(identifier: tempPathStr)!
        account.link<&{MetadataViews.ResolverCollection}>(
            tempPublicPath,
            target: value.collectionData.storagePath
        )
        let collectionCap = account.getCapability<&AnyResource{MetadataViews.ResolverCollection}>(tempPublicPath)
        if !collectionCap.check() {
            continue
        }
        let count = NFTRetrieval.getNFTCountFromCap(collectionIdentifier : key, collectionCap : collectionCap)
        if count != 0 {
            items[key] = count
        }
    }
    return items
}

Sample Response...

{
    "schmoes_prelaunch_token": 1
}

Example 4 - Retrieve all NFTs including metadata owned by an account

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub struct NFT {
    pub let id : UInt64
    pub let name : String
    pub let description : String
    pub let thumbnail : String
    pub let externalURL : String
    pub let storagePath : StoragePath
    pub let publicPath : PublicPath
    pub let privatePath: PrivatePath
    pub let publicLinkedType: Type
    pub let privateLinkedType: Type
    pub let collectionName : String
    pub let collectionDescription: String
    pub let collectionSquareImage : String
    pub let collectionBannerImage : String
    pub let royalties: [MetadataViews.Royalty]
    init(
            id: UInt64,
            name : String,
            description : String,
            thumbnail : String,
            externalURL : String,
            storagePath : StoragePath,
            publicPath : PublicPath,
            privatePath : PrivatePath,
            publicLinkedType : Type,
            privateLinkedType : Type,
						collectionIdentifier: String,
            collectionName : String,
            collectionDescription : String,
            collectionSquareImage : String,
            collectionBannerImage : String,
            royalties : [MetadataViews.Royalty]
    ) {
        self.id = id
        self.name = name
        self.description = description
        self.thumbnail = thumbnail
        self.externalURL = externalURL
        self.storagePath = storagePath
        self.publicPath = publicPath
        self.privatePath = privatePath
        self.publicLinkedType = publicLinkedType
        self.privateLinkedType = privateLinkedType
				self.collectionIdentifier = collectionIdentifier
        self.collectionName = collectionName
        self.collectionDescription = collectionDescription
        self.collectionSquareImage = collectionSquareImage
        self.collectionBannerImage = collectionBannerImage
        self.royalties = royalties
    }
}
pub fun main(ownerAddress: Address) : { String : [NFT] } {
    let catalog = NFTCatalog.getCatalog()
    let account = getAuthAccount(ownerAddress)
    let items : [NFTRetrieval.BaseNFTViewsV1] = []
    let data : {String : [NFT] } = {}
    for key in catalog.keys {
        let value = catalog[key]!
        let tempPathStr = "catalog".concat(key)
        let tempPublicPath = PublicPath(identifier: tempPathStr)!
        account.link<&{MetadataViews.ResolverCollection}>(
            tempPublicPath,
            target: value.collectionData.storagePath
        )
        let collectionCap = account.getCapability<&AnyResource{MetadataViews.ResolverCollection}>(tempPublicPath)
        if !collectionCap.check() {
            continue
        }
        let views = NFTRetrieval.getNFTViewsFromCap(collectionIdentifier : key, collectionCap : collectionCap)
        let items : [NFT] = []
        for view in views {
            let displayView = view.display
            let externalURLView = view.externalURL
            let collectionDataView = view.collectionData
            let collectionDisplayView = view.collectionDisplay
            let royaltyView = view.royalties
            if (displayView == nil || externalURLView == nil || collectionDataView == nil || collectionDisplayView == nil || royaltyView == nil) {
                // This NFT does not have the proper views implemented. Skipping....
                continue
            }
            items.append(
                NFT(
                    id: view.id,
                    name : displayView!.name,
                    description : displayView!.description,
                    thumbnail : displayView!.thumbnail.uri(),
                    externalURL : externalURLView!.url,
                    storagePath : collectionDataView!.storagePath,
                    publicPath : collectionDataView!.publicPath,
                    privatePath : collectionDataView!.providerPath,
                    publicLinkedType : collectionDataView!.publicLinkedType,
                    privateLinkedType : collectionDataView!.providerLinkedType,
										collectionIdentifier: key,
                    collectionName : collectionDisplayView!.name,
                    collectionDescription : collectionDisplayView!.description,
                    collectionSquareImage : collectionDisplayView!.squareImage.file.uri(),
                    collectionBannerImage : collectionDisplayView!.bannerImage.file.uri(),
                    royalties : royaltyView!.getRoyalties()
                )
            )
        }
        data[key] = items
    }
    return data
}

Sample Response...

{
    "FlovatarComponent": [],
    "schmoes_prelaunch_token": [
        s.aa16be98aac20e8073f923261531cbbdfae1464f570f5be796b57cdc97656248.NFT(
            id: 1006,
            name: "Schmoes Pre Launch Token #1006",
            description: "",
            thumbnail: "https://gateway.pinata.cloud/ipfs/QmXQ1iBke5wjcjYG22ACVXsCvtMJKEkwFiMf96UChP8uJq",
            externalURL: "https://schmoes.io",
            storagePath: /storage/SchmoesPreLaunchTokenCollection,
            publicPath: /public/SchmoesPreLaunchTokenCollection,
            privatePath: /private/SchmoesPreLaunchTokenCollection,
            publicLinkedType: Type<&A.6c4fe48768523577.SchmoesPreLaunchToken.Collection{A.1d7e57aa55817448.NonFungibleToken.CollectionPublic,A.  1d7e57aa55817448.NonFungibleToken.Receiver,A.1d7e57aa55817448.MetadataViews.ResolverCollection}>(),
            privateLinkedType: Type<&A.6c4fe48768523577.SchmoesPreLaunchToken.Collection{A.1d7e57aa55817448.NonFungibleToken.CollectionPublic,A.1d7e57aa55817448.NonFungibleToken.Provider,A.1d7e57aa55817448.MetadataViews.ResolverCollection}>(),
            collectionName: "Schmoes Pre Launch Token",
            collectionDescription: "",
            collectionSquareImage: "https://gateway.pinata.cloud/ipfs/QmXQ1iBke5wjcjYG22ACVXsCvtMJKEkwFiMf96UChP8uJq",
            collectionBannerImage: "https://gateway.pinata.cloud/ipfs/QmXQ1iBke5wjcjYG22ACVXsCvtMJKEkwFiMf96UChP8uJq",
            royalties: []
        )
    ],
    "Flovatar": []
}

Example 5 - Retrieve all NFTs including metadata owned by an account for large wallets

For Wallets that have a lot of NFTs you may run into memory issues. The common pattern to get around this for now is to retrieve just the ID's in a wallet by calling the following script

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub fun main(ownerAddress: Address) : {String : [UInt64]} {
    let catalog = NFTCatalog.getCatalog()
    let account = getAuthAccount(ownerAddress)
    let items : {String : [UInt64]} = {}
    for key in catalog.keys {
        let value = catalog[key]!
        let tempPathStr = "catalogIDs".concat(key)
        let tempPublicPath = PublicPath(identifier: tempPathStr)!
        account.link<&{MetadataViews.ResolverCollection}>(
            tempPublicPath,
            target: value.collectionData.storagePath
        )
        let collectionCap = account.getCapability<&AnyResource{MetadataViews.ResolverCollection}>(tempPublicPath)
        if !collectionCap.check() {
            continue
        }
        let ids = NFTRetrieval.getNFTIDsFromCap(collectionIdentifier : key, collectionCap : collectionCap)
        if ids.length > 0 {
            items[key] = ids
        }
    }
    return items
}

and then use the ids to retrieve the full metadata for only those ids by calling the following script and passing in a map of collectlionIdentifer -> [ids]

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub struct NFT {
    pub let id : UInt64
    pub let name : String
    pub let description : String
    pub let thumbnail : String
    pub let externalURL : String
    pub let storagePath : StoragePath
    pub let publicPath : PublicPath
    pub let privatePath: PrivatePath
    pub let publicLinkedType: Type
    pub let privateLinkedType: Type
    pub let collectionName : String
    pub let collectionDescription: String
    pub let collectionSquareImage : String
    pub let collectionBannerImage : String
    pub let royalties: [MetadataViews.Royalty]
    init(
            id: UInt64,
            name : String,
            description : String,
            thumbnail : String,
            externalURL : String,
            storagePath : StoragePath,
            publicPath : PublicPath,
            privatePath : PrivatePath,
            publicLinkedType : Type,
            privateLinkedType : Type,
            collectionName : String,
            collectionDescription : String,
            collectionSquareImage : String,
            collectionBannerImage : String,
            royalties : [MetadataViews.Royalty]
    ) {
        self.id = id
        self.name = name
        self.description = description
        self.thumbnail = thumbnail
        self.externalURL = externalURL
        self.storagePath = storagePath
        self.publicPath = publicPath
        self.privatePath = privatePath
        self.publicLinkedType = publicLinkedType
        self.privateLinkedType = privateLinkedType
        self.collectionName = collectionName
        self.collectionDescription = collectionDescription
        self.collectionSquareImage = collectionSquareImage
        self.collectionBannerImage = collectionBannerImage
        self.royalties = royalties
    }
}
pub fun main(ownerAddress: Address, collections: {String : [UInt64]}) : {String : [NFT] } {
    let data : {String : [NFT] } = {}
    let catalog = NFTCatalog.getCatalog()
    let account = getAuthAccount(ownerAddress)
    for collectionIdentifier in collections.keys {
        if catalog.containsKey(collectionIdentifier) {
            let value = catalog[collectionIdentifier]!
            let tempPathStr = "catalog".concat(collectionIdentifier)
            let tempPublicPath = PublicPath(identifier: tempPathStr)!
            account.link<&{MetadataViews.ResolverCollection}>(
                tempPublicPath,
                target: value.collectionData.storagePath
            )
            let collectionCap = account.getCapability<&AnyResource{MetadataViews.ResolverCollection}>(tempPublicPath)
            if !collectionCap.check() {
                return data
            }
            let views = NFTRetrieval.getNFTViewsFromIDs(collectionIdentifier : collectionIdentifier, ids: collections[collectionIdentifier]!, collectionCap : collectionCap)
            let items : [NFT] = []
            for view in views {
                    let displayView = view.display
                    let externalURLView = view.externalURL
                    let collectionDataView = view.collectionData
                    let collectionDisplayView = view.collectionDisplay
                    let royaltyView = view.royalties
                    if (displayView == nil || externalURLView == nil || collectionDataView == nil || collectionDisplayView == nil || royaltyView == nil) {
                        // Bad NFT. Skipping....
                        continue
                    }
                    items.append(
                        NFT(
                            id: view.id,
                            name : displayView!.name,
                            description : displayView!.description,
                            thumbnail : displayView!.thumbnail.uri(),
                            externalURL : externalURLView!.url,
                            storagePath : collectionDataView!.storagePath,
                            publicPath : collectionDataView!.publicPath,
                            privatePath : collectionDataView!.providerPath,
                            publicLinkedType : collectionDataView!.publicLinkedType,
                            privateLinkedType : collectionDataView!.providerLinkedType,
                            collectionName : collectionDisplayView!.name,
                            collectionDescription : collectionDisplayView!.description,
                            collectionSquareImage : collectionDisplayView!.squareImage.file.uri(),
                            collectionBannerImage : collectionDisplayView!.bannerImage.file.uri(),
                            royalties : royaltyView!.getRoyalties()
                        )
                    )
                }
                data[collectionIdentifier] = items
        }
    }
    return data
}

Example 6 - Retrieve all MetadataViews for NFTs in a wallet

If you're looking for some MetadataViews that aren't in the core view list you can leverage this script to grab all the views each NFT supports. Note: You lose some typing here but get more data.

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub struct NFTCollectionData {
    pub let storagePath : StoragePath
    pub let publicPath : PublicPath
    pub let privatePath: PrivatePath
    pub let publicLinkedType: Type
    pub let privateLinkedType: Type
    init(
            storagePath : StoragePath,
            publicPath : PublicPath,
            privatePath : PrivatePath,
            publicLinkedType : Type,
            privateLinkedType : Type,
    ) {
        self.storagePath = storagePath
        self.publicPath = publicPath
        self.privatePath = privatePath
        self.publicLinkedType = publicLinkedType
        self.privateLinkedType = privateLinkedType
    }
}
pub fun main(ownerAddress: Address) : { String : {String : AnyStruct} }  {
    let catalog = NFTCatalog.getCatalog()
    let account = getAuthAccount(ownerAddress)
    let items : [MetadataViews.NFTView] = []
    let data : { String : {String : AnyStruct} } = {}
    for key in catalog.keys {
        let value = catalog[key]!
        let tempPathStr = "catalog".concat(key)
        let tempPublicPath = PublicPath(identifier: tempPathStr)!
        account.link<&{MetadataViews.ResolverCollection}>(
            tempPublicPath,
            target: value.collectionData.storagePath
        )
        let collectionCap = account.getCapability<&AnyResource{MetadataViews.ResolverCollection}>(tempPublicPath)
        if !collectionCap.check() {
            continue
        }
        var views = NFTRetrieval.getAllMetadataViewsFromCap(collectionIdentifier : key, collectionCap : collectionCap)
        if views.keys.length == 0 {
            continue
        }
        // Cadence doesn't support function return types, lets manually get rid of it
        let nftCollectionDisplayView = views[Type<MetadataViews.NFTCollectionData>().identifier] as! MetadataViews.NFTCollectionData?
        let collectionDataView = NFTCollectionData(
                    storagePath : nftCollectionDisplayView!.storagePath,
                    publicPath : nftCollectionDisplayView!.publicPath,
                    privatePath : nftCollectionDisplayView!.providerPath,
                    publicLinkedType : nftCollectionDisplayView!.publicLinkedType,
                    privateLinkedType : nftCollectionDisplayView!.providerLinkedType,
        )
        views.insert(key: Type<MetadataViews.NFTCollectionData>().identifier, collectionDataView)
        data[key] = views
    }
    return data
}

Example 7 - Setup a user’s account to receive a specific collection

Run the following script to retrieve some collection-level information for an NFT collection identifier from the catalog

import MetadataViews from 0x1d7e57aa55817448
import NFTCatalog from 0x49a7cda3a1eecc29
import NFTRetrieval from 0x49a7cda3a1eecc29
pub struct NFTCollection {
    pub let storagePath : StoragePath
    pub let publicPath : PublicPath
    pub let privatePath: PrivatePath
    pub let publicLinkedType: Type
    pub let privateLinkedType: Type
    pub let collectionName : String
    pub let collectionDescription: String
    pub let collectionSquareImage : String
    pub let collectionBannerImage : String
    init(
            storagePath : StoragePath,
            publicPath : PublicPath,
            privatePath : PrivatePath,
            publicLinkedType : Type,
            privateLinkedType : Type,
            collectionName : String,
            collectionDescription : String,
            collectionSquareImage : String,
            collectionBannerImage : String
    ) {
        self.storagePath = storagePath
        self.publicPath = publicPath
        self.privatePath = privatePath
        self.publicLinkedType = publicLinkedType
        self.privateLinkedType = privateLinkedType
        self.collectionName = collectionName
        self.collectionDescription = collectionDescription
        self.collectionSquareImage = collectionSquareImage
        self.collectionBannerImage = collectionBannerImage
    }
}
pub fun main(collectionIdentifier : String) : NFT? {
        let catalog = NFTCatalog.getCatalog()
        assert(catalog.containsKey(collectionIdentifier), message: "Invalid Collection")
              return NFTCollection(
                  storagePath : collectionDataView!.storagePath,
                  publicPath : collectionDataView!.publicPath,
                  privatePath : collectionDataView!.providerPath,
                  publicLinkedType : collectionDataView!.publicLinkedType,
                  privateLinkedType : collectionDataView!.providerLinkedType,
                  collectionName : collectionDisplayView!.name,
                  collectionDescription : collectionDisplayView!.description,
                  collectionSquareImage : collectionDisplayView!.squareImage.file.uri(),
                  collectionBannerImage : collectionDisplayView!.bannerImage.file.uri()
              )
          }
        panic("Invalid Token ID")
}

This script result can then be used to form a transaction by inserting the relevant variables from above into a transaction template like the following:

import NonFungibleToken from 0x1d7e57aa55817448
import MetadataViews from 0x1d7e57aa55817448
{ADDITIONAL_IMPORTS}
transaction {
    prepare(signer: AuthAccount) {
        // Create a new empty collection
        let collection <- {CONTRACT_NAME}.createEmptyCollection()
        // save it to the account
        signer.save(<-collection, to: {STORAGE_PATH})
        // create a public capability for the collection
        signer.link<&{PUBLIC_LINKED_TYPE}>(
            {PUBLIC_PATH},
            target: {STORAGE_PATH}
        )
				// create a private capability for the collection
        signer.link<&{PRIVATE_LINKED_TYPE}>(
            {PRIVATE_PATH},
            target: {STORAGE_PATH}
        )
    }
}

Developer Usage

1. Install the Flow CLI

2. Install Node

3. Clone the project

git clone --depth=1 https://github.com/onflow/nft-catalog.git

4. Install packages

Run npm install in the root of the project

5. Run Test Suite

Run npm test in the root of the project

License

The works in these files:

are under the Unlicense.

NFT Catalog

Live Site​

Contract Addresses​

Submitting a Collection to the NFT Catalog​

Using the Catalog (For marketplaces and other NFT applications)​

Developer Usage​

1. Install the Flow CLI​

2. Install Node​

3. Clone the project​

4. Install packages​

5. Run Test Suite​

License​