NFT Collection Snapshot Generate with Moralis

snapshot.rb

# Quick NFT collection snapshot generated using Moralis' API.
# Works with ERC721 and 1155s.
#
# More notes here:
# https://mirror.xyz/pfeffunit.eth/NixhRf1Ghj8IxaMiJBKoXUP-wy0Mn2g7nAEpn55w3Rc

require 'net/http'
require 'uri'
require 'json'

MORALIS_API_KEY = '' # Get an API key from https://moralis.io

# Given a contract address an a page (based on Morali's pagination logic), return a batch of holder info.
def fetchHolders(contractAddress, page)
  url = "https://deep-index.moralis.io/api/v2/nft/#{contractAddress}/owners?chain=eth&format=decimal&offset="
  owners = []
  uri = URI.parse("#{url}#{500 * page}")
  request = Net::HTTP::Get.new(uri)
  request['X-API-Key'] = MORALIS_API_KEY
  req_options = {
    use_ssl: uri.scheme == "https",
  }
  response = Net::HTTP.start(uri.hostname, uri.port, req_options) do |http|
    http.request(request)
  end
  data = JSON.parse(response.body)
  return {total: data['total'], owners: data['result'].map{|r| r['owner_of']}}
end

# These are the contracts to you want to download.
# Note that this WILL NOT work for OpenSea contracts, only contracts that are bespoke to the given project.
# 'Name' is used for your sanity and for generating the CSVs.
contracts = [
  {name: 'Forgotten Runes Wizards Cult', address: '0x521f9C7505005CFA19A8E5786a9c3c9c9F5e6f42'},
  {name: 'CrypToadz', address: '0x1CB1A5e65610AEFF2551A50f76a87a7d3fB649C6'}
]

contracts.each do |c|
  puts c[:name]
  page = 0
  owners = []
  keepGoing = true
  while true do
    results = fetchHolders(c[:address], page)
    owners.concat(results[:owners])
    puts "Got #{results[:total]} of #{owners.length}..."
    if results[:total] <= owners.length
      break
    end
    page = page + 1
    sleep(1) # Be polite
  end

  File.write("#{c[:name].downcase.gsub(' ', '-')}.csv", owners.uniq.join("\n"))
end