Substrate EVM NFT Indexer

[jamesbayly]

Create a SubQuery project that indexes ERC721 NFTs from Moonbeam, Moonriver, Astar, and Shiden.

This must use SubQuery’s multi chain indexing solution

User stories

As a user, I would like to view the:

• name
• description
• collection
• price
• owner
  of all NFTs from Moonbeam, Moonriver, Astar, and Shiden in a GraphQL request

GraphQL Schema

The below is just a simple example of an excellent NFT API, your final solution does not need to match it exactly. You'll need to retrieve certain datapoints from the metadata attached to the NFT.

type nft @entity {
  id: ID
  network: network
  contract_address: String
  amount: String
  collection: collection
  minted_block: Int
  minted_timestamp: Int # unix epoch timestamp
  minter_address: Address
  current_owner: Address
  contract_type: String # e.g. ERC721, RMRK
  name: String
  symbol: String
  token_uri: String
  image_uri: String
  description: String
  metadata: JSON
}

type collection @entity {
  id: ID
  network: network
  contract_address: String
  minted_block: Int
  minted_timestamp: Int # unix epoch timestamp
  minter_address: Address
  floor_price: Int
}

type nft_transfers @entity {
  id: ID
  network: network
  block: Int
  timestamp: Int
  transaction_id: String # Hash or extrinsic id
  nft: nft
  from: address
  to: address
}

type address @entity {
  id: ID
  network: network
}

type network @entity {
  id: ID
  name: String
}

[biomassives]

We have been preparing metadata indexer for a biodiversity credit NFT rewards system seeing how possible on substrate, and would like to audit Moonbeam, Moonriver, Astar, and Shiden  ..  diving in here would be cool.